OPERATION & MAINTENANCE MANUAL...Sullair Training Department 1-888-SULLAIR or 219-879-5451 (ext....

ST30 & ST37U.S.A. & Mexico

PART NUMBER:88291013-138 R02The information in this manual is current as of its publication date.

OPERATION & MAINTENANCE MANUAL

Publication date: 1/28/2015Copyright © 2015 Sullair, LLC. All rights reserved.

WARRANTY NOTICEFailure to follow the instructions and procedures in this manual, or misuse of this equipment, will VOID its warranty!

Subject to EAR, ECCN EAR99 and related export control restrictions.

Air Care Seminar TrainingSullair Air Care Seminars are courses that provide hands-on instruction for the proper operation, maintenance,and servicing of Sullair products. Individual seminars on Stationary compressors and compressor electricalsystems are offered at regular intervals throughout the year at Sullair’s corporate headquarters training facilitylocated at Michigan City, Indiana.

Instruction includes training on the function and installation of Sullair service parts, troubleshooting commonfaults and malfunctions, and actual equipment operation. These seminars are recommended for maintenance,contractor maintenance, and service personnel.

For detailed course outlines, schedule, and cost information contact:

Sullair Training Department

1-888-SULLAIR or219-879-5451 (ext. 5623)

[email protected]

- Or Write -Sullair, LLC

3700 E. Michigan Blvd.Michigan City, IN 46360

Attn: Service Training Department.

Subject to EAR, ECCN EAR99 and related export control restrictions.

Table of Contents

ST30 & ST37 (U.S.A. & Mexico) Operation & Maintenance Manual Table of Contents

88291013-138 R02Subject to EAR, ECCN EAR99 and related export control restrictions. i

Section 1: Safety.......................................................................................................11.1 General....................................................................................................... 11.2 Personal protective equipment ................................................................... 11.3 Pressure release ........................................................................................ 11.4 Fire and explosion ...................................................................................... 21.5 Moving parts ............................................................................................... 21.6 Hot surfaces, sharp edges and sharp corners............................................ 31.7 Toxic and irritating substances................................................................... 31.8 Electrical shock........................................................................................... 41.9 Lifting .......................................................................................................... 41.10 Entrapment ................................................................................................. 51.11 Implementation of lockout/tagout................................................................ 51.12 Safety warnings .......................................................................................... 6

Section 2: Description..............................................................................................92.1 The air compression cycle.......................................................................... 92.2 Air inlet system ......................................................................................... 12

2.2.1 General operation of the air inlet system.............................................................122.2.2 Air filter.................................................................................................................122.2.3 Inlet valve.............................................................................................................12

2.3 Discharge system..................................................................................... 122.3.1 General operation of the discharge system.........................................................122.3.2 Minimum pressure valve......................................................................................132.3.3 Automatic blowdown valve ..................................................................................132.3.4 Pressure relief valve ............................................................................................132.3.5 Aftercooler ...........................................................................................................132.3.6 Moisture separator...............................................................................................13

2.4 Lubrication system.................................................................................... 132.4.1 General description of the lubrication system......................................................132.4.2 Lubricating fluid....................................................................................................132.4.3 Fluid filter .............................................................................................................142.4.4 Purge oil return line..............................................................................................14

2.5 Cooling system......................................................................................... 142.5.1 General description of the cooling system...........................................................142.5.2 Ambient temperature ...........................................................................................14

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Table of Contents ST30 & ST37 (U.S.A. & Mexico) Operation & Maintenance Manual

2.6 Fluid/air separation system.......................................................................142.6.1 General description of the fluid/air separation system ........................................ 142.6.2 Fluid/air separator tank ....................................................................................... 152.6.3 Fluid/air separator element ................................................................................. 15

2.7 Microprocessor control system .................................................................15

Section 3: Specifications....................................................................................... 173.1 Machine specifications..............................................................................173.2 Lubricant specifications.............................................................................17

Section 4: Installation & Setup ............................................................................. 194.1 Compressor pre-installation ......................................................................194.2 Guidelines for lifting and moving the compressor .....................................19

4.2.1 Guidelines for moving the compressor with a forklift........................................... 194.2.2 Guidelines for moving the compressor with a crane ........................................... 19

4.3 Compressor installation ............................................................................194.3.1 Physical installation requirements....................................................................... 194.3.2 Heat rejection and ventilation requirements........................................................ 20

4.4 Connection to the air system ....................................................................204.5 Mechanical checks....................................................................................20

4.5.1 Checking the motor to air end coupling............................................................... 204.5.2 Checking the air end ........................................................................................... 204.5.3 Checking the compressor fluid level ................................................................... 214.5.4 Checking the isolation gate valve........................................................................ 21

4.6 Electrical checks .......................................................................................214.6.1 Power supply requirements................................................................................. 214.6.2 Checking the motor rotation direction ................................................................. 21

Section 5: Operation .............................................................................................. 235.1 Compressor protection features................................................................23

5.1.1 Stop run-on timer ................................................................................................ 235.1.2 Emergency stop .................................................................................................. 23

5.2 Starting the compressor for the first time..................................................235.3 Starting the compressor............................................................................245.4 Shutting down the compressor .................................................................245.5 Electronic controller ..................................................................................245.6 High temperature shutdown......................................................................245.7 Motor overload protection .........................................................................245.8 Phase failure/reversal ...............................................................................255.9 Run-on timer .............................................................................................25

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ST30 & ST37 (U.S.A. & Mexico) Operation & Maintenance Manual Table of Contents

Section 6: Maintenance..........................................................................................276.1 General..................................................................................................... 276.2 Daily maintenance.................................................................................... 27

6.2.1 Before starting the compressor............................................................................276.2.2 After starting the compressor...............................................................................27

6.3 Recommended maintenance schedule .................................................... 286.3.1 Service at 50 operating hours..............................................................................286.3.2 Service every 1000 operating hours ....................................................................286.3.3 Service every 2000 operating hours ....................................................................286.3.4 Service every 4000 operating hours (or semi-annually) ......................................286.3.5 Service every 8000 hours (or yearly)...................................................................286.3.6 Compressor fluid levels .......................................................................................29

6.4 Compressor maintenance ........................................................................ 296.4.1 Adding compressor fluid ......................................................................................296.4.2 Changing compressor fluid ..................................................................................296.4.3 Fluid filter maintenance........................................................................................306.4.4 Air filter maintenance ...........................................................................................306.4.5 Purge oil return line filter maintenance ................................................................316.4.6 Fluid/air separator maintenance ..........................................................................316.4.7 Minimum pressure valve maintenance ...............................................................336.4.8 Blowdown valve maintenance .............................................................................336.4.9 Solenoid valve maintenance................................................................................336.4.10 Pressure regulator maintenance..........................................................................336.4.11 Drive coupling maintenance ................................................................................34

6.5 Main motor operation and maintenance ................................................... 346.5.1 Main motor operation...........................................................................................356.5.2 Main motor maintenance and repair ....................................................................356.5.3 Periodic inspection of the main motor..................................................................356.5.4 Check and clean the windings .............................................................................36

6.6 Troubleshooting........................................................................................ 36

Section 7: Parts List ...............................................................................................397.1 Procedure for ordering parts..................................................................... 397.2 Recommended spare parts list................................................................. 407.3 Motor and air end system (ST3008) ......................................................... 427.4 Motor and air end system (ST3708) ......................................................... 447.5 Air inlet system (ST3008) ......................................................................... 467.6 Air inlet system (ST3708) ......................................................................... 487.7 Fluid piping system................................................................................... 507.8 Cooling fan system................................................................................... 527.9 Fluid/air separation system....................................................................... 547.10 Air discharge system ................................................................................ 567.11 Control system.......................................................................................... 58

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Table of Contents ST30 & ST37 (U.S.A. & Mexico) Operation & Maintenance Manual

7.12 Starter assembly—460V...........................................................................627.13 Enclosure ..................................................................................................647.14 Decal locations..........................................................................................66

Appendix A: System Diagrams............................................................................. 69A.1 ST30 & ST37 identification .......................................................................69A.2 ST30 & ST37 piping and instrumentation .................................................70

Appendix B: Metric & Imperial Nominal Sizes..................................................... 72

Section 1

ST30 & ST37 (U.S.A. & Mexico) Operation & Maintenance Manual 1: Safety

88291013-138 R02Subject to EAR, ECCN EAR99 and related export control restrictions. 1

Safety

1.1 GeneralSullair and its subsidiaries design and manufacture all oftheir products so they can be operated safely. However,the responsibility for safe operation rests with those whouse and maintain these products. The following safetyprecautions are offered as a guide which, if conscien-tiously followed, will minimize the possibility of accidentsthroughout the useful life of this equipment.

The compressor should be operated only by those whohave been trained and delegated to do so, and who haveread and understood this Operator’s Manual. Failure tofollow the instructions, procedures and safetyprecautions in this manual may result in accidents andinjuries. NEVER start the compressor unless it is safe todo so. DO NOT attempt to operate the compressor with aknown unsafe condition. Tag the compressor and renderit inoperative by disconnecting and locking out all powerat source or otherwise disabling its prime mover soothers who may not know of the unsafe condition cannotattempt to operate it until the condition is corrected.

Install, use and operate the compressor only in fullcompliance with all pertinent OSHA regulations and/orany applicable Federal, State, and Local codes,standards and regulations. DO NOT modify thecompressor and/or controls in any way except withwritten factory approval.

While not specifically applicable to all types of compres-sors with all types of prime movers, most of the precau-tionary statements contained herein are applicable to

most compressors and the concepts behind these state-ments are generally applicable to all compressors.

1.2 Personal protective equipmentA. Prior to installing or operating the compressor, own-

ers, employers and users should become familiarwith, and comply with, all applicable OSHA regula-tions and/or any applicable Federal, State and Localcodes, standards, and regulations relative to per-sonal protective equipment, such as eye and faceprotective equipment, respiratory protective equip-ment, equipment intended to protect the extremities,protective clothing, protective shields and barriersand electrical protective equipment, as well as noiseexposure administrative and/or engineering controlsand/or personal hearing protective equipment.

1.3 Pressure releaseA. Install an appropriate flow-limiting valve between the

service air outlet and the shut-off (throttle) valve,either at the compressor or at any other point alongthe air line, when an air hose exceeding ½″ (13 mm)inside diameter is to be connected to the shut-off(throttle) valve, to reduce pressure in case of hosefailure, per OSHA Standard 29 CFR 1926.302(b)(7)and/or any applicable Federal, State and Localcodes, standards and regulations.

B. When the hose is to be used to supply a manifold,install an additional appropriate flow-limiting valvebetween the manifold and each air hose exceeding½″ (13 mm) inside diameter that is to be connectedto the manifold to reduce pressure in case of hosefailure.

C. Provide an appropriate flow-limiting valve at thebeginning of each additional 75 feet (23 m) of hose inruns of air hose exceeding ½″ (13 mm) inside diame-ter to reduce pressure in case of hose failure.

D. Flow-limiting valves are listed by pipe size and flow-rated. Select appropriate valves accordingly, in

NOTE

Operator is required to readentire instruction manual.

1: Safety ST30 & ST37 (U.S.A. & Mexico) Operation & Maintenance Manual

88291013-138 R022 Subject to EAR, ECCN EAR99 and related export control restrictions.

accordance with their manufacturer's recommenda-tions.

E. DO NOT use air tools that are rated below the maxi-mum rating of the compressor. Select air tools, airhoses, pipes, valves, filters and other fittings accord-ingly. DO NOT exceed manufacturer’s rated safeoperating pressures for these items.

F. Secure all hose connections by wire, chain or othersuitable retaining device to prevent tools or hoseends from being accidentally disconnected andexpelled.

G. Open fluid filler cap only when compressor is not run-ning and is not pressurized. Shut down the compres-sor and bleed the receiver tank to zero internalpressure before removing the cap.

H. Vent all internal pressure prior to opening any line, fit-ting, hose, valve, drain plug, connection or othercomponent, such as filters and line oilers, and beforeattempting to refill optional air line anti-icer systemswith antifreeze compound.

I. Keep personnel out of line with and away from thedischarge opening of hoses or tools or other points ofcompressed air discharge.

J. DO NOT use air at pressures higher than 2.1 bar forcleaning purposes, and then only with effective chipguarding and personal protective equipment perOSHA Standard 29 CFR 1910.242(b) and/or anyapplicable Federal, State, and Local codes, stan-dards and regulations.

K. DO NOT engage in horseplay with air hoses asdeath or serious injury may result.

1.4 Fire and explosionA. Clean up spills of lubricant or other combustible sub-

stances immediately, if such spills occur.

B. Shut off the compressor and allow it to cool. Thenkeep sparks, flames and other sources of ignitionaway and DO NOT permit smoking in the vicinitywhen checking or adding lubricant or when refillingair line anti-icer systems with antifreeze compound.

C. DO NOT permit fluids, including air line anti-icer sys-tem antifreeze compound or fluid film, to accumulateon, under or around acoustical material, or on anyexternal surfaces of the air compressor. Wipe downusing an aqueous industrial cleaner or steam cleanas required. If necessary, remove acoustical mate-rial, clean all surfaces and then replace acoustical

material. Any acoustical material with a protectivecovering that has been torn or punctured should bereplaced immediately to prevent accumulation of liq-uids or fluid film within the material. DO NOT useflammable solvents for cleaning purposes.

D. Disconnect and lock out all power at source prior toattempting any repairs or cleaning of the compressoror of the inside of the enclosure, if any.

E. Keep electrical wiring, including all terminals andpressure connectors in good condition. Replace anywiring that has cracked, cut, abraded or otherwisedegraded insulation, or terminals that are worn, dis-colored or corroded. Keep all terminals and pressureconnectors clean and tight.

F. Keep grounded and/or conductive objects such astools away from exposed live electrical parts such asterminals to avoid arcing which might serve as asource of ignition.

G. Remove any acoustical material or other materialthat may be damaged by heat or that may supportcombustion and is in close proximity, prior to attempt-ing weld repairs.

H. Keep suitable fully charged Class BC or ABC fireextinguisher or extinguishers nearby when servicingand operating the compressor.

I. Keep oily rags, trash, leaves, litter or other combusti-bles out of and away from the compressor.

J. DO NOT operate the compressor without proper flowof cooling air or water or with inadequate flow of lubri-cant or with degraded lubricant.

K. DO NOT attempt to operate the compressor in anyclassification of hazardous environment unless thecompressor has been specially designed and manu-factured for that duty.

1.5 Moving partsA. Keep hands, arms and other parts of the body and

clothing away from couplings, belts, pulleys, fans andother moving parts.

B. DO NOT attempt to operate the compressor with thefan, coupling or other guards removed.

C. Wear snug-fitting clothing and confine long hair whenworking around this compressor, especially whenexposed to hot or moving parts.

D. Keep access doors, if any, closed except when mak-ing repairs or adjustments.



E. Make sure all personnel are out of and/or clear of thecompressor prior to attempting to start or operate it.

F. Disconnect and lock out all power at source and ver-ify at the compressor that all circuits are de-energizedto minimize the possibility of accidental start-up, oroperation, prior to attempting repairs or adjustments.This is especially important when compressors areremotely controlled.

G. Keep hands, feet, floors, controls and walking sur-faces clean and free of fluid, water or other liquids tominimize the possibility of slips and falls.

1.6 Hot surfaces, sharp edges and sharp corners

A. Avoid bodily contact with hot fluid, hot coolant, hotsurfaces and sharp edges and corners.

B. Keep all parts of the body away from all points of airdischarge.

C. Wear personal protective equipment including glovesand head covering when working in, on or around thecompressor.

D. Keep a first aid kit handy. Seek medical assistancepromptly in case of injury. DO NOT ignore small cutsand burns as they may lead to infection

1.7 Toxic and irritating substancesA. DO NOT use air from this compressor for respiration

(breathing) except in full compliance with OSHAStandards 29 CFR 1910 and/or any applicable Fed-eral, State or Local codes or regulations.

B. DO NOT use air line anti-icer systems in air linessupplying respirators or other breathing air utilizationequipment and DO NOT discharge air from thesesystems into unventilated or other confined areas.

C. Operate the compressor only in open or adequatelyventilated areas.

D. Locate the compressor or provide a remote inlet sothat it is not likely to ingest exhaust fumes or othertoxic, noxious or corrosive fumes or substances.

E. Coolants and lubricants used in this compressor aretypical of the industry. Care should be taken to avoidaccidental ingestion and/or skin contact. In the eventof ingestion, seek medical treatment promptly. Washwith soap and water in the event of skin contact.Consult Material Safety Data Sheet for informationpertaining to fluid of fill.

F. Wear goggles or a full face shield when adding anti-freeze compound to air line anti-icer systems.

G. If air line anti-icer system antifreeze compoundenters the eyes or if fumes irritate the eyes, theyshould be washed with large quantities of cleanwater for fifteen minutes. A physician, preferably aneye specialist, should be contacted immediately.

H. DO NOT store air line anti-icer system antifreezecompound in confined areas.

I. The antifreeze compound used in air line antifreezesystems contains methanol and is toxic, harmful orfatal if swallowed. Avoid contact with the skin or eyesand avoid breathing the fumes. If swallowed, inducevomiting by administering a tablespoon of salt, ineach glass of clean, warm water until vomit is clear,then administer two teaspoons of baking soda in aglass of clean water. Have patient lay down and

DANGER

Death or serious injury can result from inhaling compressed air without using proper safety equipment. See OSHA standards and/or any applicable Federal, State, and Local codes, stan-dards and regulations on safety equipment.



cover eyes to exclude light. Call a physician immedi-ately.

1.8 Electrical shockA. This compressor should be installed and maintained

in full compliance with all applicable Federal, Stateand Local codes, standards and regulations, includ-ing those of the National Electrical Code, and alsoincluding those relative to equipment grounding con-ductors, and only by personnel that are trained, qual-ified and delegated to do so.

B. Keep all parts of the body and any hand-held tools orother conductive objects away from exposed liveparts of electrical system. Maintain dry footing, standon insulating surfaces and DO NOT contact anyother portion of the compressor when making adjust-ments or repairs to exposed live parts of the electricalsystem. Make all such adjustments or repairs withone hand only, so as to minimize the possibility ofcreating a current path through the heart.

C. Attempt repairs in clean, dry and well lighted andventilated areas only.

D. DO NOT leave the compressor unattended with openelectrical enclosures. If necessary to do so, then discon-nect, lock out and tag all power at source so others willnot inadvertently restore power.

E. Disconnect, lock out, and tag all power at sourceprior to attempting repairs or adjustments to rotatingmachinery and prior to handling any ungroundedconductors.

1.9 LiftingA. If the compressor is provided with a lifting bail, then

lift by the bail provided. If no bail is provided, then liftby sling. Compressors to be air-lifted by helicoptermust not be supported by the lifting bail but by slingsinstead. In any event, lift and/or handle only in fullcompliance with OSHA standards 29 CFR 1910 sub-part N and/or any applicable Federal, State, andLocal codes, standards and regulations.

B. Inspect points of attachment for cracked welds andfor cracked, bent, corroded or otherwise degradedmembers and for loose bolts or nuts prior to lifting.

C. Make sure entire lifting, rigging and supporting struc-ture has been inspected, is in good condition and hasa rated capacity of at least the weight of the com-pressor. If you are unsure of the weight, then weighcompressor before lifting.

D. Make sure lifting hook has a functional safety latch orequivalent, and is fully engaged and latched on thebail or slings.

E. Use guide ropes or equivalent to prevent twisting orswinging of the compressor once it has been liftedclear of the ground.

F. DO NOT attempt to lift in high winds.

G. Keep all personnel out from under and away from thecompressor whenever it is suspended.

H. Lift compressor no higher than necessary.

I. Keep lift operator in constant attendance whenevercompressor is suspended.

DANGER

All field equipment must be tested for electro-static fields prior to servicing or making contact with the machine using the following or equiva-lent test equipment:

• 90 – 600 VAC: Volt detector such as Fluke Model 1AC-A

• 600 – 7000 VAC: Voltage detector such as Fluke Networks Model C9970

It is the responsibility of each organization to provide/arrange training for all their associates expected to test for electrostatic fields.



J. Set compressor down only on a level surface capa-ble of safely supporting at least its weight and itsloading unit.

K. When moving the compressor by forklift truck, utilizefork pockets if provided. Otherwise, utilize pallet ifprovided. If neither fork pockets or pallet are pro-vided, then make sure compressor is secure and wellbalanced on forks before attempting to raise or trans-port it any significant distance.

L. Make sure forklift truck forks are fully engaged andtipped back prior to lifting or transporting the com-pressor.

M. Forklift no higher than necessary to clear obstaclesat floor level and transport and corner at minimumpractical speeds.

N. Make sure pallet-mounted compressors are firmlybolted or otherwise secured to the pallet prior toattempting to forklift or transport them. NEVERattempt to forklift a compressor that is not secured toits pallet, as uneven floors or sudden stops maycause the compressor to tumble off, possibly causingserious injury or property damage in the process.

1.10 EntrapmentA. If the compressor enclosure, if any, is large enough

to hold a man and if it is necessary to enter it to per-form service adjustments, inform other personnelbefore doing so, or else secure and tag the accessdoor in the open position to avoid the possibility ofothers closing and possibly latching the door withpersonnel inside.

B. Make sure all personnel are out of compressorbefore closing and latching enclosure doors.

1.11 Implementation of lockout/tagoutThe energy control procedure defines actions necessaryto lockout a power source of any machine to be repaired,serviced or set-up, where unexpected motion, or anelectrical or other energy source, would cause personalinjury or equipment damage. The power source on anymachine shall be locked out by each employee doing thework except when motion is necessary during setup,adjustment or trouble-shooting.

A. The established procedures for the application ofenergy control shall cover the following elements andactions and shall be initiated only by Authorized Per-sons and done in the following sequence:

1. Review the equipment or machine to belocked and tagged out.

2. Alert operator and supervisor of whichmachine is to be worked on, and that powerand utilities will be turned off.

3. Check to make certain no one is operatingthe machine before turning off the power.

4. Turn off the equipment using normal shut-down procedure.

5. Disconnect the energy sources:a. Air and hydraulic lines should be bled,

drained and cleaned out. There shouldbe no pressure in these lines or in thereservoir tanks. Lockout or tag lines orvalves.

b. Any mechanism under tension or pres-sure, such as springs, should bereleased and locked out or tagged.

c. Block any load or machine part prior toworking under it.

d. Electrical circuits should be checked withcalibrated electrical testing equipmentand stored energy and electrical capaci-tors should be safely discharged.

6. Lockout and/or Tagout each energy sourceusing the proper energy isolating devicesand tags. Place lockout hasp and padlock ortag at the point of power disconnect wherelockout is required by each person perform-ing work. Each person shall be provided withtheir own padlock and have possession ofthe only key. If more than one person isworking on a machine each person shall affixpersonal lock and tag using a multi-lockdevice.

7. Tagout devices shall be used only whenpower sources are not capable of beinglocked out by use of padlocks and lockouthasp devices. The name of the person affix-ing tag to power source must be on tag alongwith date tag was placed on power source.

8. Release stored energy and bring the equip-ment to a “zero mechanical state”.

9. Verify Isolation: Before work is started, testequipment to ensure power is disconnected.

B. General Security

1. The lock shall be removed by the “Autho-rized” person who put the lock on theenergy-isolating device. No one other thanthe person/persons placing padlocks and



lockout hasps on power shall remove pad-lock and lockout hasps and restore power.However, when the authorized person whoapplied the lock is unavailable to remove ithis/her Supervisor may remove padlock/pad-locks and lockout hasps and restore poweronly if it is first:a. verified that no person will be exposed to

danger.b. verified that the “Authorized” person who

applied the device is not in the facility.c. noted that all reasonable efforts to con-

tact the “Authorized” person have beenmade to inform him or her that the lock-out or tagout device has been removed.

d. ensured that the “Authorized” person isnotified of lock removal before returningto work.

2. Tagout System—Tags are warning devicesaffixed at points of power disconnect and arenot to be removed by anyone other that theperson placing tag on power lockout. Tagsshall never be by-passed, ignored, or other-wise defeated.

1.12 Safety warningsThe following special instructions apply to VSD packagesprovided with electronic adjustable speed motor drives.These cautions that apply to VSD operation.

WARNING

Ground the unit following the instructions in this manual. Ungrounded units may cause electric shock and/or fire. The variable speed drive has a large capacitive leakage current during opera-tion, which can cause enclosure parts to be above ground potential. Proper grounding, as described in this manual, is required. Failure to observe this precaution could result in death or severe injury.

WARNING

Before applying power to the variable speed drive, make sure that the front and cable covers are closed and fastened to prevent exposure to potential electrical fault conditions. Failure to observe this precaution could result in death or severe injury.

WARNING

Refer all drive service to trained technicians. This equipment should be installed, adjusted, and serviced by qualified electrical maintenance personnel familiar with the construction and operation of this type of equipment and the haz-ards involved and in accordance with published service manuals. Failure to observe this precau-tion could result in death or severe injury.

WARNING

Line terminals (L1, L2, L3), motor terminals (U, V, W) and the DC link/brake resistor terminals (-/+) are live when the drive is connected to power, even if the motor is not running. Contact with this voltage is extremely dangerous and may cause death or severe injury.



WARNING

Before opening the variable speed drive covers:

• Disconnect all power to the variable speed drive.

• Wait a minimum of 5 (five) minutes after all the lights on the keypad are off. This allows time for the DC bus capacitors to discharge.

• A hazard voltage may still remain in the DC bus capacitors even if the power has been turned off. Confirm that the capacitors have fully dis-charged by measuring their voltage using a multimeter set to measure DC voltage. Failure to follow the above precautions may cause death or severe injury.

CAUTION

Do not perform any megger or voltage withstand tests on any part of the variable speed drive or its components. Improper testing may result in damage. Prior to any tests or measurements of the motor or the motor cable, disconnect the motor cable at the variable speed drive output terminals (U, VW) to avoid damaging the vari-able speed drive during motor or cable testing.

CAUTION

Do not touch any components on the circuit boards. Static voltage discharge may damage the components.

CAUTION

Install the variable speed drive in a well venti-lated room that is not subject to temperature extremes, high humidity, or condensation, and avoid locations that are directly exposed to sun-light, or have high concentrations of dust, corro-sive gas, explosive gas, inflammable gas, grinding fluid mist, etc. Improper installation may result in a fire hazard.

CAUTION

Make sure that no power correction capacitors are connected to the variable speed drive output or the motor terminals to prevent variable speed drive malfunction and potential damage.

CAUTION

Make sure that the variable speed drive output terminals (U, V, W) are not connected to the util-ity line power as severe damage to the VSD may occur.

NOTEInterior electrical wiring is performed at the fac-tory. Required customer wiring is minimal, but should be done by a qualified electrician in com-pliance with OSHA, National Electrical Code, and/or any other applicable State, Federal, and local electrical codes concerning isolation switches, fused disconnects, etc. Sullair pro-vides a wiring diagram for use by the installer.

NOTECustomer must provide electrical supply power disconnect within sight of machine.


Notes:


Section 2

ST30 & ST37 (U.S.A. & Mexico) Operation & Maintenance Manual 2: Description


Description2.1 The air compression cycleThe ShopTek™ air compressor uses a lubricated rotaryscrew air end and supporting components to create com-pressed air.

When the rotors inside the air end turn, they draw outsideair into the compressor through the air inlet system. Asthe rotors compress this air from atmospheric pressure tothe target pressure, the lubrication system injects fluidinto the air end to cool the compressed air, lubricate therotors and bearings, and create a seal between the rotorsand the air end casing.

After leaving the air end, the compressed air/fluid mixtureflows into the fluid/air separation system. First, the fluid/air separator tank separates the majority of the fluid from

the compressed air using a combination of centrifugalforce, impingement, and gravity. Then the compressedair passes through the fluid/air separator element toremove almost all of the remaining fluid.

Next, the compressed air flows through the aftercooler.The aftercooler cools the compressed air to 8 – 12°C(14 – 22°F) above the ambient temperature. The com-pressed air then flows through the moisture separator (ifinstalled). The moisture separator collects the watervapor that condensed when the compressed air wascooled.

After leaving the aftercooler (or the moisture separator, ifinstalled), the compressed air flows through the serviceconnector of the compressor for downstream use.

2: Description ST30 & ST37 (U.S.A. & Mexico) Operation & Maintenance Manual


Figure 2-1: ST30 & ST37 machine layout

1. Fluid piping system 5. Discharge system2. Air inlet system 6. Electric control system3. Motor & air end 7. Enclosure4. Cooling fan system 8. Fluid/air separation system



Figure 2-2: ST30 & ST37 piping and instrumentation

Key Description1 Air filter2 Inlet valve3 Capacity control integrated system4 Oil cooler5 Pressure switch6 Indicator7 Aftercooler8 Minimum pressure valve9 Single-stage fluid/air separator element10 Strainer11 Moisture separator12 Pressure sensor13 Temperature sensor14 Compressor air end15 Relief valve16 Fluid/air separator tank17 Sight glass18 Oil plug19 Fluid filter20 Fluid filter pressure difference indicator21 Strainer22 Sight glass23 Orifice24 Thermal valve



2.2 Air inlet systemThe air inlet system provides air for the compressor topressurize. The primary components of the air inlet sys-tem are the air filter, inlet valve, and compressor air end.

2.2.1 General operation of the air inlet system

The air end draws outside air through the air filter andinlet valve into the air end compression chamber. Insidethe compression chamber, a male and female rotor pairrevolve at high speed, compressing the air and increas-ing its pressure. When the compressed air/fluid mixturereaches the end of the compression chamber, the mix-ture flows through the air end discharge port into thefluid/air separator.

2.2.2 Air filterThe air filter removes particulates from the intake air, pro-viding clean air to the compressor. If these particulateswere not removed, they could wear down rotor surfacesand contaminate the compressor fluid.

2.2.2.1 Air filter elementBecause the air filter element traps the particulates it fil-ters from the air on its surface, the air filter element mustbe changed periodically to maintain the air filter’s effec-tiveness.

Additional information• For the recommended air filter maintenance

schedule, see Section 6.3: Recommendedmaintenance schedule on page 28.

• For instructions on how to change the air filterelement, see Section 6.4.4: Air filter mainte-nance on page 30.

2.2.3 Inlet valveThe inlet valve controls intake air volume using a modula-tion control system.

2.2.3.1 Inlet modulationTo minimize the number of starts and stops the compres-sor makes, the inlet modulation system automatically

adjusts the size of the inlet valve opening to match airdemand. The primary components of the inlet modulationsystem are the solenoid valve, inlet valve, blowdownvalve, and control line.

When air demand is equal to or greater than the com-pressors rating, the compressor will run at full load. Thesolenoid valve is energized, closing the control line.Because the control is not in use, the inlet valve of the airend is fully open.

When air demand is lower than the compressor rating,discharge pressure builds up slowly. Once the dischargepressure reaches the unload setting of the controller, thecompressor will switch to unload mode. The solenoidvalve is de-energized, opening the control line. Becausethe control line is in use and the discharge pressure ishigh, the control line closes the inlet valve. At the sametime, the blowdown valve opens to release the pressurein the fluid/air separator tank until the pressure stabilizesat 15 – 25 psi.

Now the compressor will with no load for a preset time.Once the preset time is reached, the compressor willstop. However, if the discharge pressure drops to theload setting of the controller before the preset time isreached, the compressor re-enters load mode. The sole-noid valve is energized, closing the control line. Becausethe control is not in use, the inlet valve of the air end isfully open.

2.3 Discharge systemThe discharge system pushes air from the compressorair end to the service connector. The primary compo-nents of the discharge system are the compressor airend, fluid/air separator, minimum pressure valve, pres-sure relief valve, automatic blowdown valve, aftercooler,moisture separator (optional), and service connector.

2.3.1 General operation of the discharge system

The compressed air/fluid mixture flows through the airend discharge port into the fluid/air separator tank andseparator element. The separator tank and elementremove fluid from the air.

The compressed air then flows through the minimumpressure valve, followed by the aftercooler, then themoisture separator (if installed). Once the air is cooledand the moisture removed (if the moisture separator isinstalled), the air flows to the service connector for down-stream use.

To lower the frequency of the compressor’s load/unloadcycles and extend the life of the compressor, Sullair rec-

WARRANTY NOTICEFailure to follow the air filter maintenance sched-ule or use Sullair genuine air filter elements can cause early contamination of the compressor fluid and the fluid/air separator element and may void your warranty.



ommends installing a wet air receiver after the serviceconnector.

Additional information• For the size of the service connector, see Sec-

tion 3.1: Machine specifications on page 17.

2.3.2 Minimum pressure valveThe minimum pressure valve on the top cover of the fluid/air separator ensures lubricant flow during both normaloperation and start-up by keeping pressure in the fluid/airseparator above 340 kPa (49.3 psi).

When pressure in the fluid/air separator is above 340 kPa(49.3 psi) and higher than the downstream pipeline pres-sure, the minimum pressure valve will be opened. Other-wise, the minimum pressure valve will be closed tomaintain minimum tank pressure.

The minimum pressure valve also functions as a check(non-return) valve, preventing compressed air down-stream of the separator from flowing back into the sepa-rator and air end during compressor blowdown.

2.3.3 Automatic blowdown valveWhen the compressor is unloading or stopping, the blow-down valve in the control line automatically opens torelease pressure. The blowdown valve routes the air tothe air inlet pipe (after the air filter) to prevent a com-pressed air/fluid mixture from venting into the atmo-sphere.

2.3.4 Pressure relief valveTo prevent damage to the fluid/air separator and othercompressor components the pressure relief valve locatedon the fluid/air separator tank will open when the pres-sure in the separator tank exceeds the pressure reliefvalve setpoint.

Under normal operating conditions, the over pressurestop switch will shut down the compressor before thepressure relief valve setpoint is reached (see Section 3.1:Machine specifications on page 17). However, the pres-sure relief valve serves as an additional mechanical safe-guard.

2.3.5 AftercoolerThe aftercooler cools the compressed air to 8 – 12°C(14 – 22°F) above the ambient temperature. This coolingcauses water vapor to condense, which creates moisturein the compressed air stream.

2.3.6 Moisture separatorThe moisture separator removes the moisture from thecompressed air stream. Moisture collected by the mois-ture separator can then be safely disposed of accordingto local regulations.

2.4 Lubrication systemThe lubrication system cools the compressor; lubricatesthe rotors, bearings, and gears; and seals the air endagainst leaks. The primary components of the lubricationsystem are the compressor air end, fluid/air separator,thermal valve, aftercooler, fluid filter, and interconnectingpiping.

2.4.1 General description of the lubrication system

Fluid is injected into the air end compression chamber,where it is compressed along with the intake air. Thecompressed air/fluid mixture then flows into the fluid/airseparation system, which separates the fluid from the airand collects the fluid for re-use. Depending on the fluidtemperature, the thermal valve routes none, some, or allof the fluid to the aftercooler for cooling. Fluid that haspassed through the aftercooler, or that was not routed tothe aftercooler, flows through the fluid filter into the airend to restart the lubrication cycle.

2.4.2 Lubricating fluidThe lubricating fluid provides three benefits.

• Cooling. The compressor fluid acts as a cool-ant, absorbing the large amount of heat gener-ated during compression.

• Lubricating. The compressor fluid forms alayer between the rotors, preventing the maleand female rotors from making direct contactand minimizing the surface wear of the rotors.The compressor fluid also lubricates the bear-ings and gears.

• Sealing. Compressor fluid with sufficient vis-cosity can fill the gaps between rotors andbetween the rotors and the casing. Thisreduces air lost through leakage and increasesthe efficiency of the compressor.

NOTEThe moisture separator ships loose for the cus-tomer to install if needed for their installation. It is not installed by the factory.



Additional information• For the viscosity required for the compressor

fluid to act as a sealant, see Section 3.2: Lubri-cant specifications on page 17.

2.4.3 Fluid filterThe fluid filter collects any impurities in the compressorfluid and ensures that only clean fluid enters the air endcompression chamber and internal lubrication feeds. Ifthese impurities in the fluid were not removed, they wouldcause wear on the rotor and gear surfaces and bearingsand shorten the life of compressor.

2.4.3.1 Fluid filter elementBecause the fluid filter element collects impurities on itssurface, the fluid filter element must be replaced regularlyto ensure good fluid circulation for proper lubrication andcooling.

Additional information• For the recommended fluid filter maintenance

schedule, see Section 6.3: Recommendedmaintenance schedule on page 28.

• For instructions on how to change the fluid filterelement, see Section 6.4.3: Fluid filter mainte-nance on page 30.

2.4.4 Purge oil return lineThe purge oil return line located on the cover of the fluid/air separator passes the compressor fluid collected bythe fluid/air separator element through the purge line fil-ter, then returns the clean fluid to the compressor air end.

A small orifice in the purge oil return line limits return airflow, minimizing the loss of compressed air. A sight glasslocated in the purge line allows an operator to observethe amount of fluid returning from the separator element.

2.5 Cooling systemThe cooling system maintains a proper operating temper-ature for the compressor.

2.5.1 General description of the cooling system

Suction created by an axial flow cooling fan pulls coolingair through louvers on both sides of the compressor. Thiscooling air draws heat from the aftercooler before flowingout of the machine.

2.5.2 Ambient temperatureSullair ShopTek™ compressors are designed to operatein ambient temperatures between 4°C and 40°C (40°Fand 104°F), measured at the cooling air inlet. If you needto operate the compressor in a temperature outside thisrange, contact your Sullair representative.

2.5.2.1 High ambient temperature and overheating

If the ambient temperature is above 40°C (104°F), the airdrawn into the compressor may be too hot to adequatelycool the compressor fluid or the electric motor when thecompressor is operating at full load. If the compressorload is less than 100%, operating the compressor inhigher ambient temperatures may be possible.

Regardless of the ambient temperature, the maximumrecommended operating temperature is 108°C (226°F).

2.6 Fluid/air separation systemThe fluid/air separator system removes the fluid from thecompressed air stream. The primary components of thefluid/air separation system are the fluid/air separator tankand fluid/air separator element.

2.6.1 General description of the fluid/air separation system

The compressed air/fluid mixture from the air end flowsinto the fluid/air separator and strikes the wall of the sep-arator tank, causing large drops of fluid to form becauseof the lower air speed. Most of these fluid drops attach tothe wall of the tank, and gravity causes the drops to col-lect at the bottom of the tank. The thermal valve thenroutes this collected fluid back to the air end through theaftercooler (if necessary) and the filter.

CAUTION

Continuously exceeding the maximum operating temperature will damage the compressor.

CAUTION

In the event of a high operating temperature shutdown fault, do not attempt to restart the compressor without first finding and correcting the underlying cause. Contact your Sullair repre-sentative for assistance.



After hitting the wall of the separator tank, the com-pressed air/fluid mixture then flows through the separatorelement. The separator element removes fine fluid parti-cles. These particles accumulate at the bottom of the ele-ment and return to the air end through the purge oil returnline.

2.6.2 Fluid/air separator tankIn addition to separating the air from the fluid, the fluid/airseparator tank acts as a fluid reservoir, storing most ofthe compressor fluid.

2.6.2.1 Fluid filler port and sight glassThe fluid/air separator tank is equipped with a fluid fillerport and sight glass. Since trace amounts of compressorfluid remain in the discharged compressed air even afterseparation, over time the fluid level of the compressor willdrop. You will need to monitor the fluid level and periodi-cally add additional fluid to the tank.

Additional information• For an explanation of how determine the fluid

level of the compressor, see Section 6.3.6:Compressor fluid levels on page 29.

• For instructions on how to add compressorfluid, see Section 6.4.1: Adding compressorfluid on page 29.

2.6.2.2 Separator tank condensation—low operating temperature

In conditions of high humidity and low operating tempera-ture, water formed by condensation may collect in thecompressor fluid. To ensure trouble-free operation, Sul-lair ShopTek™ compressors are fitted with an oil bypass

thermal valve set at 83°C (181°F), the temperaturerequired to evaporate water.

In areas where the ambient temperature is less than 4°C(40°F), you may need to take steps to prevent condensa-tion. This may include fitting anti-condensation heaters tothe separator vessel. For assistance in operating thecompressor in very low ambient temperatures, pleasecontact your Sullair representative.

2.6.3 Fluid/air separator elementThe fluid/air separator element removes fine fluid parti-cles from the compressed air stream.

Over time, impurities in the lubrication system will clogthe fluid/air separator element, increasing the resistanceof the separator to compressed air flow. Because theincreased resistance will compromise the compressor’soperation, the separator element needs to be replacedperiodically.

Additional information• For the recommended fluid/air separator ele-

ment maintenance schedule, see Section 6.3:Recommended maintenance schedule on page28.

• For instructions on how to change the fluid/airseparator element, see Section 6.4.6: Fluid/airseparator maintenance on page 31.

2.7 Microprocessor control systemThe ShopTek™ compressor is equipped with a micropro-cessor controller. For detailed information on this control-ler, see EC2000 Controller Operation Manual.


Notes:


Section 3

ST30 & ST37 (U.S.A. & Mexico) Operation & Maintenance Manual 3: Specifications


Specifications3.1 Machine specifications

3.2 Lubricant specificationsThe oil used as a lubricant in Sullair’s rotary screw com-pressors must have the following properties:

• Low foaming• Good resistance to emulsification• High oxidation resistance• Viscosity of 10.5 cSt at the compressor’s oper-

ating temperature

Table 3-1: Compressor specifications

Model ST3008 ST3708Capacity at full load pressure 4.5 m3/min (160 cfm) 6.1 m3/min (216 cfm)

Rated pressure 8 bar (115 psi) 8 bar (115 psi)

Maximum working pressure 8.6 bar (125 psi) 8.6 bar (125 psi)

Relief valve setpoint 10 bar (145 psi) 10 bar (145 psi)

Voltage & frequency 460V/60 Hz

Air end type Single stage, oil injected rotary screw

Configuration Gear driven with integrated inlet modulation

Motor type ODP (IP23)

Motor rating 30 kW (40 hp) 37 kW (50 hp)

Motor nominal speed 1770 rpm

Starting mode Y-∆ (Y-delta)

Service factor 1.15

Ambient temperature Between 4° and 40°C (40° and 104°F)

Lubricant Sullube®

Lubricant volume 22 L (5.8 gal) 26 L (6.9 gal)

Service connector NPT 1½″

Moisture drain connector NPT ⅛″ (moisture separator shipped loose)

Machine weight 900 kg (1984 lbs) 998 kg (2200 lbs)

Machine dimensions (L × W × H) 1700 × 935 × 1450 mm (66.9 × 36.8 × 57.1 in)

Package dimensions (L × W × H) 1820 × 1120 × 1625 mm (71.7 × 44.1 × 64.0 in)

Table 3-2: Lubricant specifications

Synthetic oils Ambient temperatureSullube® (factory fill) Up to 40°C (104°F)

WARRANTY INFORMATIONMixing of fluids other than Sullube® will void the compressor’s warranty.

3: Specifications ST30 & ST37 (U.S.A. & Mexico) Operation & Maintenance Manual

Notes:


Section 4

ST30 & ST37 (U.S.A. & Mexico) Operation & Maintenance Manual 4: Installation & Setup


Installation & Setup

4.1 Compressor pre-installationBefore installing your ShopTek™ compressor, check itcarefully for any transportation damage. If you find anydamage, contact your Sullair representative immediately.

4.2 Guidelines for lifting and moving the compressor

Sullair recommends using a forklift to move the compres-sor. A crane can also be used.

4.2.1 Guidelines for moving the compressor with a forklift

When using a forklift to move the compressor, follow alllocal regulations for operating a forklift. In addition, Sullairhas several guidelines that must be followed.

• The forklift’s load rating must be sufficient to liftthe compressor’s weight (see Section 3.1:Machine specifications on page 17).

• The forklift must lift the compressor from thefront.

• The fork tines must be correctly spaced.• The fork lift tines must be long enough to cover

the full depth of the compressor.• The fork tines must be fully engaged and tipped

back prior to lifting the compressor.

4.2.2 Guidelines for moving the compressor with a crane

If a crane is used to move the compressor, ensure thatit’s rating is sufficient to lift the compressor’s weight (seeSection 3.1: Machine specifications on page 17).

When moving the compressor with a crane, lift the com-pressor with slings and use guide ropes to prevent twist-ing. You should also use spreader bars to prevent paneldamage.

When the compressor has been set down, check forcracked welds and loose bolts or nuts.

4.3 Compressor installationThe ShopTek™ compressor is not weatherproof. Thecompressor should be installed inside (or in a shelteredposition outside).

4.3.1 Physical installation requirementsBecause the compressor must remain level at all times(not more than 6 mm or ¼″ unevenness allowed), youshould install the compressor on a flat surface rated tohold the compressor’s weight (see Section 3.1: Machinespecifications on page 17). If you must install the com-pressor on an uneven surface, you can use shims tolevel the compressor. You do not need to bolt the com-pressor in place.

You must position the compressor so it has sufficientclearance on all sides (for the minimum distancesrequired, see Section A.1: ST30 & ST37 identification onpage 69). If you have more than one compressorinstalled at the same location, you must have clearaccess to each compressor. If you need help correctlypositioning your compressor, contact your Sullair repre-sentative for assistance.

WARNING

Incorrect installation or setup may void warranty.

NOTEA site assessment must be carried out to ensure forklift or crane access for removal and servicing of major components and compressor transport.

NOTEA site assessment must be carried out to ensure forklift or crane access for removal and servicing of major components and compressor transport.

4: Installation & Setup ST30 & ST37 (U.S.A. & Mexico) Operation & Maintenance Manual


4.3.2 Heat rejection and ventilation requirements

The compressor rejects a considerable amount of heat,so you must install it in a well-ventilated area.

Hot air from the cooling air discharge must not recirculateinto the cooling air inlet. This recirculation can be causedby installing the compressor in a room with a low ceilingor in a location where the cooling air is discharged pastthe compressor’s cooling air inlet. In these situations, youshould follow the guidelines in Section 4.3.2.1: Poorlyventilated areas.

4.3.2.1 Poorly ventilated areasIn a poorly ventilated area, the heated cooling air dis-charged from the compressor can cause the ambienttemperature to rise above 40°C (104°F), which will causethe compressor to overheat. Sullair recommends addingductwork to route the cooling air discharge away from thecompressor, possibly to another area or room. Any duct-work added (including the outlet grill) should not cause apressure drop greater than 30 Pa (.004 psi) (contact Sul-lair Aftermarket prior to installation) and must not applyany weight to the compressor cabinet. Sullair also recom-mends a section of the ductwork be removable to alloweasy access for servicing.

4.3.2.2 Additional considerations for multiple compressor installations

In a multiple compressor installation, the air dischargedfrom one compressor must never flow into the intake ofanother compressor.

4.3.2.3 Ventilation and existing high ambient temperature

If the compressor is in a location where existing environ-mental conditions will cause the ambient temperature toexceed 40°C (104°F) even if the cooling air is adequatelydissipated (for example, in a boiler room), Sullair recom-mends following the guidelines in Section 4.3.2.1: Poorlyventilated areas.

4.4 Connection to the air systemSullair recommends installing an isolation gate valveimmediately after the service connector to make installa-tion, service, and removal of the compressor easier.

You must install a flexible connection between thecompressor and the external pipe work. Because theinternal components of the compressor are mounted onanti-vibration pads and are not rigidly supported, no loadshould ever be transferred to the service connector of thecompressor.

The plant air line should have an internal diameter atleast the size of the service connector (for service con-nector size, see Section 3.1: Machine specifications onpage 17). For longer pipe runs, the pipe sizes should beincreased by one size to minimize pressure drop. Con-densate from the pipe work should never flow towardsthe compressor. One way of achieving this is to installmains pipe work adjacent to the compressor and belowthe service connector.

Additional information• For the exact location of the service connector,

see Section A.1: ST30 & ST37 identification onpage 69.

4.5 Mechanical checks

4.5.1 Checking the motor to air end coupling

Ensure that the flexible drive coupling connecting themotor and air end is correctly fastened.

4.5.2 Checking the air endBefore a new machine is started for the first time, youmust check that the air end is not hydraulically locked.

IMPORTANTDo not install the compressor in an area where exhaust fumes or other toxic, noxious, or corro-sive fumes, chemicals, or substances can be drawn into the air inlet.

WARRANTY INFORMATIONFailure to install a flexible connection may result in damage to the compressor and void your war-ranty.

WARNING

Ensure that the compressor is electrically iso-lated before performing any mechanical checks.

ST30 & ST37 (U.S.A. & Mexico) Operation & Maintenance Manual 4: Installation & Setup


4.5.2.1 Checking the air end of a new machineRotate the flexible drive coupling by hand through twocomplete revolutions in the direction indicated by thearrows located on the air end and motor.

4.5.3 Checking the compressor fluid levelOpen the front access panel just enough to view the sightglass located on the separator tank, then follow theinstructions in Section 6.3.6: Compressor fluid levels onpage 29 for how to check the compressor’s fluid level.

• If the fluid level is below the minimum fluidlevel, see Section 6.4.1: Adding compressorfluid on page 29.

4.5.4 Checking the isolation gate valveIf an isolation gate valve is installed in your air system,make sure the valve is open.

4.6 Electrical checksWhen performing any electrical work, refer to the electri-cal diagram supplied with your compressor.

All the compressor’s internal wiring is factory fitted andtested. The required connection wiring is minimal, but itmust be performed by a licensed electrician. A licensedelectrician must also review the electrical system to seethat it is adequate for starting and running the compres-sor.

4.6.1 Power supply requirements• Depending on the electrical frequency and volt-

age in your region, your power supply will beeither:

• 460 VAC, 3-phase, 60 Hz with ground• Control voltage: 110 VAC

4.6.2 Checking the motor rotation directionFor the motor to rotate in the correct direction, the powersupply must be correctly connected.

You should check the rotation of the motor before startingup the compressor for use. Before checking the motorrotation direction, you must familiarize yourself with Sec-tion 5: Operation.

1. Pull out emergency stop (E-stop) button fromthe monitor’s control panel.

2. Press the Start button.• If the phase sequence is wrong, a com-

pressor with a phase sequence protectorwill not start and the controller will displayan error message.

3. Immediately press the E-Stop button.• This will cause the motor and air end to

rotate momentarily, but not long enough todamage the air end if the motor rotationdirection is reversed.

4. Check that the motor and air end rotate inthe direction indicated by the arrows on theair end to motor drive coupling.• If the motor and air end do not rotate in the

direction indicated by the arrows, theincoming mains power leads need to bereversed by a licensed electrician.

• Do not reverse any motor or starter wir-ing. This wiring must not be modified.

WARNING

Never run the motor with the rotation direction reversed!

Motor rotation in the wrong direction can dam-age the air end and may void your warranty.

4: Installation & Setup ST30 & ST37 (U.S.A. & Mexico) Operation & Maintenance Manual

Notes:


Section 5

ST30 & ST37 (U.S.A. & Mexico) Operation & Maintenance Manual 5: Operation


Operation5.1 Compressor protection featuresYour ShopTek™ compressor controller optimizes the per-formance of your system by adding additional electronicprotection to the motor and air end.

5.1.1 Stop run-on timerThis stop run-on timer provides a soft stop function,reducing the load on the air end before stopping the com-pressor. When you press the Stop button, the compres-sor will unload and then run for a period of time pre-setby the factory, reducing the pressure in the separatortank, before coming to a complete stop.

5.1.2 Emergency stopPressing the emergency stop (E-stop) button will stop thecompressor immediately.

You must pull out the E-stop button to release it beforethe compressor can be restarted.

5.2 Starting the compressor for the first time

1. Read the preceding pages of this manualthoroughly.

2. If you are installing the compressor, confirmyou have followed all the requirements and

guidelines in Section 4.3: Compressor instal-lation and Section 4.4: Connection to the airsystem.

3. Perform all mechanical checks described inSection 4.5.

4. Open the isolation gate valve if it is installed.5. If you are installing the compressor, perform

the motor rotation direction check describedin Section 4.6.2.

6. Switch on the mains power (if it is notalready on).

7. Press the Start button.• The compressor will start and switch from

the Y start configuration to the delta run-ning configuration as it reaches full speed.

8. Monitor the status of the compressor on thecontroller display.• Rising discharge air pressure and rising

operating temperature indicate correctoperation (see Section 2.1: The air com-pression cycle on page 9).

• On reaching the preset operating pressure,the controller will unload the compressorand the discharge air pressure will stop ris-ing. The compressor will continue to run,but it will run unloaded.

9. Run the compressor through a number ofload/unload cycles (bleed air from the plantair system, if necessary) and check for con-sistent operation, leaks (air or fluid), and astable operating temperature (see Section2.5: Cooling system on page 14).

NOTEYou should always use the Stop button to stop the compressor under normal circumstances.

You should only use the E-stop button to stop the compressor in an emergency.

NOTEAlso follow this procedure if the compressor has been out of service for more than 60 days or you have installed the compressor in a new location.

CAUTION

The compressor should always run smoothly. If the compressor vibrates excessively while run-ning, shut it down and contact your Sullair repre-sentative immediately.

5: Operation ST30 & ST37 (U.S.A. & Mexico) Operation & Maintenance Manual


5.3 Starting the compressorIf the compressor has been out of service for more than60 days or you have installed the compressor in a newlocation, follow the steps under Section 5.2: Starting thecompressor for the first time instead of this procedure.

1. Open the isolation gate valve if it is installed.2. Press the Start button.

5.4 Shutting down the compressor1. Press the Stop button.

• The compressor will begin a delayed stopsequence and will stop automatically afterthe delayed stop sequence is complete.

• During the delayed stop sequencepressing the Start button will not restartthe compressor. You can only restartthe compressor after the delayed stopsequence is complete.

5.5 Electronic controllerThe EC2000 Controller Operation Manual describes thelayout and explains the features of the ShopTek™ elec-tronic controller.

5.6 High temperature shutdownThe electronic controller will shut down the compressor ifthe fluid temperature sensor reports a separator tanktemperature above 113°C (235°F). This shutdown tem-perature is set at the factory and should not be changed.

A high temperature shutdown places the electronic con-troller into fault mode, which prevents the compressorfrom restarting. After the compressor cools down, thefault mode may be cleared by pressing the Reset buttonon the controller.

5.7 Motor overload protectionBoth the compressor main drive motor and the fan motorhave overload protection. If either motor draws too muchcurrent, its overload protection will shut down the com-pressor.

A motor overload protection shutdown places the elec-tronic controller into fault mode, which prevents the com-

WARNING

Never assume that the compressor has com-pletely stopped, even if the compressor does not appear to be running. The compressor may be in standby mode and restart at any time. Do not remove any covers or panels or attempt any ser-vice without first isolating the compressor from the mains power supply and tagging it.

WARNING

For safety reasons, the electronic controller pressure settings should never be adjusted to anything other than the required settings for the serial plate nominal operating pressure. If you require different pressure settings, contact your Sullair representative.

Adjusting the nominal operating pressure above the maximum working pressure of your com-pressor as indicated on the serial number plate may damage your compressor and void your warranty.

CAUTION

In the event of a high operating temperature shutdown fault, do not attempt to restart the compressor without first finding and correcting the underlying cause. Contact your Sullair repre-sentative for assistance.

ST30 & ST37 (U.S.A. & Mexico) Operation & Maintenance Manual 5: Operation


pressor from restarting. The fault mode may be clearedby pressing the Reset button on the controller.

5.8 Phase failure/reversalThe electronic controller includes a phase failure/reversalmonitor to protect against reverse motor rotation. Themonitor can detect an under voltage condition, theabsence of a supply phase, or the incorrect sequencingof the supply power. If the monitor detects any of theseconditions, the electronic controller will shut down thecompressor. A licensed electrician must examine thecompressor to resolve the problem.

5.9 Run-on timerKeeping with Sullair’s philosophy of minimizing energyconsumption, the electronic controller has a run-on timer.The run-on timer monitors how long the compressor hasrun without compressing air. If this length of time isgreater than the pre-set run-on time, the compressor willenter standby mode. The compressor will automaticallyrestart if a fall in system pressure is registered.

The factory setting of the run-on time is six minutes, butyou can use the electronic controller to adjust the run-ontime to anywhere between zero and ten minutes toensure that the compressor does not exceed six shutdowns per hour. Contact your Sullair representativebefore making any adjustments, since an incorrect set-ting may result in damage to the compressor.

CAUTION

In the event of a motor overload protection shut-down fault, do not attempt to restart the com-pressor without first finding and correcting the underlying cause that triggered the motor over-load protection.

You can contact your Sullair representative for assistance in finding and correcting the underly-ing cause of a motor overload protection shut-down condition.

WARNING

Never assume that the compressor has com-pletely stopped, even if the compressor does not appear to be running. The compressor may be in standby mode and restart at any time. Do not remove any covers or panels or attempt any ser-vice without first isolating the compressor from the mains power supply and tagging it.

5: Operation ST30 & ST37 (U.S.A. & Mexico) Operation & Maintenance Manual

Notes:


Section 6

ST30 & ST37 (U.S.A. & Mexico) Operation & Maintenance Manual 6: Maintenance


Maintenance6.1 GeneralNormal operation of your compressor depends upon per-forming maintenance and service correctly and accordingto a consistent schedule.

To help you follow this schedule, the ShopTek™ micro-processor controller has a programmable service timer.When the service timer reaches the programmed value,the controller will display a service reminder message inthe status column. (After service is performed, you mustreset the service timer. For more information, see theEC2000 Controller Operation Manual.)

6.2 Daily maintenanceIf the compressor is run 24 hours a day, perform the ser-vices listed in Section 6.2.1 and Section 6.2.2 frequently.

6.2.1 Before starting the compressor• Check the compressor fluid level and add fluid

if necessary.

• Drain the water from the moisture separator.

6.2.2 After starting the compressor• Monitor the electronic controller display for any

fault messages or abnormal readings (forexample, unusually high or low temperatures orpressures).

• Check for fluid or air leaks, excessive vibration,or unusual sounds.

WARNING

Isolate the compressor from the power supply before performing any maintenance or service work.

WARNING

Do not disassemble any component of the com-pressor when the compressor is running or pres-surized. Before disassembling any compressor component, shut down the compressor, isolate the compressor from any sources of external pressure, and bleed the compressor’s internal pressure to zero.

WARRANTY NOTICEFailure to use Sullair genuine parts when servic-ing a Sullair compressor may void your warranty.

WARNING

If you need to open the fluid filler plug, wait for the fluid level to settle and the separator tank to depressurize.

6: Maintenance ST30 & ST37 (U.S.A. & Mexico) Operation & Maintenance Manual


6.3 Recommended maintenance schedule

6.3.1 Service at 50 operating hours• Replace the fluid filter element.• Check the condition of the purge oil return line

filter and replace the filter if necessary.• Tighten all electrical connections.• Assess the condition of the air filter element. If

it is excessively dirty, you may need to replaceit more frequently than the normal schedule(every 2000 hours).

6.3.2 Service every 1000 operating hours• Replace the fluid filter element(s).• Inspect the air filter element and replace it if

necessary.

• Check the condition of the purge oil return linefilter and replace the filter if necessary.

• Tighten all electrical connections.

6.3.3 Service every 2000 operating hoursPerform all checks listed for every 1000 hours plus:

• Replace the air filter element.• Grease the main motor bearings.

• Use POLYREX EM grease unless themotor nameplate indicates a differentgrease model.

• Refer to the motor nameplate for greasefilling volume and filling locations.

• Take a sample of the compressor fluid andsend it for analysis.

• Change the compressor fluid (Sullube®) ifthe analysis indicates it is necessary.

6.3.4 Service every 4000 operating hours (or semi-annually)

Perform all checks listed for every 1000 and 2000 hoursplus:

• Replace the fluid/air separator element andpurge oil return line filter.

• Inspect the flexible drive coupling and service itif necessary.

• Tighten all nuts, bolts, pipe fittings and electri-cal connections.

• Check that all safety devices are operating cor-rectly.

6.3.5 Service every 8000 hours (or yearly)Perform all checks listed for every 1000, 2000, and 4000hours plus:

• Change the compressor fluid (Sullube®)

Table 6-1: Standard maintenance intervals

Fluid

Change intervals1(all hours are operating hours)

FluidFluid filter2

Fluid/air separator element Air filter2

Sullube® 1 year or 8000 hours 1000 hours6 months or 4000 hours 2000 hours

1 If multiple intervals are listed, change the item at whichever interval is reached first.

2 If the compressor is in a dusty environment, you should service the fluid and air filters more frequently.

NOTEService intervals may be extended if the com-pressor is installed in a clean, cool environment. Contact your Sullair representative for advice on the correct service intervals for your installation.



6.3.6 Compressor fluid levels

Check the fluid level when the compressor is running.The fluid level in the sight glass should normally bebetween halfway and three-quarters of the way up thesight glass.

• While the compressor is running, the fluid levelshould never exceed the maximum fluid levelshown in Figure 6-1.

• Fluid should be added before the fluid leveldrops below the minimum fluid level shown inFigure 6-1.

6.4 Compressor maintenanceRefer to Section 7: Parts List for the part numbers of alitems mentioned in this section.

6.4.1 Adding compressor fluidWhen adding compressor fluid, only use new Sullube®fluid. Using dirty or used fluid may cause poor perfor-mance, foaming, and clogging of the filter element, noz-zle, or pipes.

1. Shut down the compressor, bleed pressureto zero, and allow the compressor to cool.

2. Slowly loosen the fluid filler cap by turning itto the left by hand to allow any trapped air tovent, then remove the cap.

3. Pour fluid into the fluid filler.4. Replace the fluid filler cap by turning the cap

to the right by hand until it will not turn anyfurther. Ensure the O-ring is properly seated.

5. Run the compressor for a short period oftime and check the fluid level through thesight glass, adding more fluid if necessary(see Section 6.3.6: Compressor fluid levels).

6.4.2 Changing compressor fluidWhen changing compressor fluid, only use new Sullube®fluid. Using dirty or used fluid may cause poor perfor-mance, foaming, and clogging of the filter element, noz-zle, or pipes.

Figure 6-1: Compressor fluid levels

1. Fluid filler2. Sight glassA. Maximum fluid levelB. Normal fluid levelC. Minimum fluid level

WARNING

Do not attempt any maintenance when the com-pressor is running or pressurized. Stop the com-pressor, relieve all internal pressure, and isolate the power supply before performing mainte-nance. Only a competent person, experienced in compressor service, should perform any service, including maintenance.


6: Maintenance ST30 & ST37 (U.S.A. & Mexico) Operation & Maintenance Manual


Clean the lubrication system before changing fluid. If theambient temperature is outside of the allowed range forthe fluid, please contact your Sullair representative.

1. Shut down the compressor, bleed pressureto zero, and allow the compressor to cool.

2. Slowly remove the plug from the ball valve atthe bottom of the fluid/air separator tank.

3. Securely attach a drain hose to the valve.• It may be convenient to run the waste fluid

directly into a waste fluid drum.4. Slowly open the ball valve. Leave the valve

open until the fluid stops draining.

5. Close the valve and remove the drain hose.6. Replace the plug.7. Remove the fluid filler cap.8. Pour fluid into the fluid filler.9. Replace the fluid filler cap by turning the cap

to the right by hand until it will not turn anyfurther. Ensure the O-ring is properly seated.

10. Run the compressor for a short period oftime and check the fluid level through thesight glass, adding more fluid if necessary(see Section 6.3.6: Compressor fluid levels).

6.4.3 Fluid filter maintenanceReplace the fluid filter element every 1000 hours of ser-vice. The fluid filter service indicator will display a warn-ing when the fluid filter element has exceeded its usefulservice life.

6.4.3.1 Replacing the fluid filter element1. Shut down the compressor and bleed pres-

sure to zero.2. Remove the old element and washer using a

filter wrench.3. Clean the washer seating surface.

4. Apply a light film of silicone grease to thenew washer.

5. Hand tighten the new element until thewasher is seated.

6. Continue to tighten the element by hand anadditional ½ to ¾ turn.

7. Restart the compressor and check for leaks.

6.4.4 Air filter maintenanceInspect the air filter element every 1000 hours of service.Replace the air filter element every 2000 hours of serviceor if the service indicator of the air filter is in the red zonewhen running the compressor at full load.

6.4.4.1 Replacing the air filter element1. Shut down the compressor.2. Clean the shell of filter.3. Loosen the clamp.4. Screw off rubber ring inside the dust cover

and dust off.


CAUTION

Assume the fluid is hot and under pressure.

Figure 6-2: Fluid filter

1. Top cover2. Washer3. Fluid filter element11 Element part number: 250025-526

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