Como Medir FETs

8/4/2019 Como Medir FETs

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FreesunBeijingTechnology Co.,Ltd .

Operating Instructions

Electronic Ballast

575/1200 EB Universal

- flicker free -

FreesunBeijingTechnology Co.,Ltd.3FLOOR BAOFENG BUILDING, 160 EAST EIGHT HOUSE, JIANGTAi VILLAGE,

CHAOYANG DISTRICT, BEIJING, CHINA

HTTP://www.bjfreesun.com

TEL: 0086-10-52038831/32

FAX: 0086-10-52038807


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Contents Page

1. General Remarks ................................................................................................... 3

2 Important Safety Instructions................................................................................. 3

3 .Product Description............................................................................................... 44. Start-Up Procedure. ............................................................................................... 5

4.1 Energizing System ............................................................................................ 5

4.2 Control of Light Intensity.................................................................................. 5

4.3 Reduction of Lamp Noise ..................................................................................5

5. Technical Data............................................................................................................ 5

6. Trouble Shooting Guide............................................................................................. 6

7. Connector Wiring8

8. Operating Parts 9

Operating Parts on Front Panel .9

Block Diagram EB 575/1200 Universal10

Diagram Bottom Plate, back EB 575/1200 Universal.11

Diagram Heat Sink right EB 575/1200 Universal.12

Diagram Heat Sink left EB 575/1200 Universal (1)13

Diagram Heat Sink left EB 575/1200 Universal (2)14

Diagram Bottom Plate, front EB 575/1200 Universal..15

Diagram Bottom Plate, bottom EB 575/1200 Universal.16

Diagram Cover EB 575/1200 Universal17

9. Measuring Instructions..19

Measuring Instructions M 1,2 - 1................................................................................19








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OPERATING INSTRUCTIONSElectronic Ballast 575/1200EB Universal

1. General Remarks Please read the following operating instructions very carefully

before using the Electronic Ballast (EB) the first time. Theycontain important information and instructions for the safety, useand maintenance of the appliance. For your own safety please

follow all safety instructions and warnings. Keep the operating

instructions carefully in a safe place and pass them to any futureowner.

2. Important Safety 2.1 Warning - High voltages inside ballast ! Danger to life !

Instructions Disconnect EB from power supply before opening

(pull out the line plug). Do not pull on the connection cable, buton the plug, to disconnect the EB from mains. Any repairs or

changing of the line plug must only be carried out by qualifiedpersonnel or ervice departments.

2.2 Before connecting the Electronic Ballast to the power supply

ensure that the socket is correctly wired. Do not use without

adequate earth connection unless either an isolation transformeror an earth-leakage trip is employed.

2.3 Lamphead must be disconnected from Electronic Ballast or

Electronic Ballast must be disconnected from mains before

fitting or replacing a lamp.

2.4 The Electronic Ballast must be switched off before

connecting or disconnecting either head or supply cable. Do not

use connectors with permitted cross section of the leads. injury tothe user as well as damage to the ballast could be caused.

2.5 The Electronic Ballast satisfies the standards of the

recognized state of the engineering and the pertinent safety

regulation of DIN EN 60598/1 and DIN EN 60065 for electricalappliances.

2.6 Supply voltage must not exceed the ranges that are given in

the "Technical Data" (see page5). Check that the power supplyvoltage and wiring is suitable for the ballast to be used. Supply

voltages which are greater or less than that specified for the

ballast can cause injury to the user as well as damage to the

ballast. The electronic of the EB is built in a housing withprotective class I and protective rate IP 22.

Ambient operating temperatures must be between -20C and +

50C!Neither back and side heat sinks nor air slots for ventilation

should ever be covered or masked.

The EB must be placed only on solid, flat and dry ground.Temperature of the ground should be less than 50C. If the EB


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could slip over the ground, it must be fastened.

Protect EB against direct sunshine. Protection against rain isneeded when wind pushes water drops direct into the air slots of

the EB (acc. to protective rate IP 22).

It is not allowed to operate the EB in high humidity (dew) or in

agressive or explosive gas-air mixtures.2.7 The Electronic Ballast must be used only according to the

directions in this "Operating Instruction". The manufacturer shall

not be liable for any damages caused by unintended use or wrongoperation.

2.8 The user of the Electronic Ballast is urgently requested to

observe either the following instructions:

lace the ballast into operation if damages are apparent.

information given in these operating instructions, connect and

operate it as shown on the serial number plate.e the EB from mains (pull out

the line plug).

the EB must be carried out by a qualified personnel or service

only.

Use only original accessories.

worn-out Electronic Ballasts inoperable immediately by

pulling out the line plug and cutting the line cable at the ballast.Then dispose of the Electronic Ballast properly.

Make sure that children do not operate the EB.

out line plug before you

clean it or do maintenance work on it.Clean EB dry only or with a moist cloth. Never immerse it into

water.

Do not use the connection cables of the EB for carrying, do notpull them over sharp edges, clamp them under doors or clamp

them in any other way.

Switch off EB when it is not needed.

3. Product Description The 575/1200 EB is part of an optimized lighting system along withall 575W and1200W luminaires .

It is suitable for both professional indoor and outdoor use (IP22

protection).

Note: The Electronic Ballast 575/1200 EB meets the European

Council Directive 89/336/EEC of electromagnetic compatibility.

Over an extensive range limits of radio disturbance

characteristic B are fulfilled. But on principle it has to beclassified under characteristic A, group 1.


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Although limits of radio disturbance characteristic A are

prescribed for industrial areas administrative authority can allowthe use of equipment with chacteristic A in other than industrial

areas. Compared to magnetic ballasts there are a number of

advantages when operating daylight-lamps with Electronic

Ballasts:

lamp power

on the power of the lamp (see also "Technical Data" for limits,

on page 5).

on the power of the lamp

ballasts

-in to a casing with type of protection IP22.

4. Start-up procedure All operating controls and cable connections are arranged onthe front panel.

4.1 Energizing System

-position.

properly checked daylight luminaire with headto ballast cable to electronic ballast

Voltage is applied and the Main Circuit Breaker is in "ON"

position.

front plate illuminates. If not, disconnect EB from mains (pull

out line plug) and check power supply and socket (Ref. 2.2. on

page 3)-position as well on the EB as

on the head. Lamp will ignite after about 5 sec.

ignition was successful.

4.2 Control of light intensity

After warming up, the light intensity of the metal halide


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daylight-lamp may be controlled by the dimming potentiometer

(stepless). The nominal lamp power can be adjusted between50 - 100% (left stop = MIN, right stop = MAX of power).

4.3 Reduction of lamp noise

When metal halide day light lamps are operated in theflicker

free mode some noise might occur, due to the specialsquare-wave operation of the lamp.

1. In the positionflicker free (yellow LED indicating light) the

electronic ballast will operateflicker free up to 10,000 fps, thelamp gives out a constant light.

2. In the position "50 Hz" and "60 Hz" (red LED indicating

light) noise will be substantially reduced, the amount

depending on the lamp, in some cases even to almost zero.The light, however, is NOT flicker free any more. When

operating in this mode, the same limitations for speed of

camera and/or shutter angle apply as for magnetic ballasts. All

other advantages of the electronicballast will apply as before!

If in doubt (i.e. remote from ballast) with the flicker analyzerP.R.O.F. light can be checked to be flicker free or not.

5. Technical Data Mains supply

Line Power : 2290 VA (max.)Supply Voltage : 90 - 125V~ / 180 - 250V~ 50/60 Hz

Nominal Current : 25 - 18A / 13 - 9A

Power Factor : cos

Lamp connectionLamp Power : 575 / 1200W constant control

Power Regulation : autom. recognition of lamp-types

575W and 1200WCurrent Characteristic : square wave, ca. 75 Hz

Dimming : Range 50 - 100% of nominal Lamp

power

Starting : cold start and hot restriketypical light ripple : typ. < 3%

Dimensions

width height depth : 200 150 300 mmWeight : ca. 7 kg

Protective Rate : IP 22

6. Trouble Shooting 6.1 Does supply voltage correspond with ballast required voltage?

Dual voltage Guide ballasts are autoswitching.


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6.2. Ensure ballast wattage matches lamp power!

6.3 Ensure correct lamp is fitted!

6.4 Connect ballast to power supply and test earth (LED PEhas to be on)..

6.5 Re-energizing system: Ensure ON/OFF Switch is in "OFF"

position. Set ON/OFF switch to "ON". Switch should nowilluminate.WAITAfter approx. 5 seconds lamp should ignite.

6.6 If lamp does not strike, the safety circuit may be broken -

check if lens door is fully shut and the lens safety switch isactivated.

6.7 Is there a good power supply to the ballast?

6.8 Is the ballast main circuit breaker in ON position?

6.9 If a ballast / head to ballast cable / luminaire does not workthen all three units should be considered faulty. Do not try a

suspected luminaire with another ballast - you may end up with

two faulty

ballasts!To check if a ballast is good, run it with a known good luminaire

and known goodhead to ballast cable.

6.10 If a ballast cuts out after running a few minutes there are a

number of possible failures:

-out in the ballast may have activated due to

extreme ambient temperature or exposure to direct sunlight in hot

summer conditions.case the ballast

can be used after it had cooled down and the condition causing

the overheating is removed.

drop-outs the ballast switches off to protect itself. If running on a

generator the output should be regulated between 95120 V

respectively 195 - 245V.-out

switch the ballast "OFF" and "ON" again. The ballast should

start up as normal.

cables will alsocause the protection circuit to be activated. Test the ballast with a

known good luminaire. If cables are suspect, they should be

exchanged with known good cables.If a ballast is found to be faulty ideally it should be returned

together with the luminaire and head to ballast cable to the

service location for examination.


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Measuring Instructions M1,2 - 1Check of Power SupplyThe admissable power supply (voltage) range for Electronic Ballasts (EB) 575/ 1200 EB

Universal is

90 Veff to 125 Veff and 190 Veff to 250 Veff .These limits are not to be exceeded either before or during operation of the EB, sincethis could

cause operating failure and damages of the EB.

Moreover, operation at voltage limits 90 V / 180 V and 125 V / 250 V is only allowed forshort

periods of time (max. 0,5 hrs).

Power supply can be checked with common RMS- Voltmeters.

At loss of serveral half-cycles in power supply, EB switches to stand-by, and has to berestarted

(switch OFF, and ON again).

The EB may only be operated if above mentioned limit values are safely kept, andeventual

failure/malfunction of power supply has been eliminated.


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Measuring Instructions M 1, 2 - 2Pre-ChecksEven before opening up the EB for an inspection, certain statements in regard to the

operating

conditions of the ballast can be made. To conduct the tests listed in the following, the unithas to beoperated under no-load-condition.1st Test - Starting procedure : (Starting sequence of EB-internal contactors/relais,

fuse-test).2nd Test - Outlet voltages : (Measuring of voltages at the EB's lamp connector).

Depending on the results of both checks the possible point and cause of failure already

might be

located roughly.

WARNING : Electronic Ballasts do not operate separated from mains. Measuring

instruments

therefore always must be connected ground-free. There might be line voltage at thecontacts of the EB's lamp-connector outlet.

The necessary safety rules for this type of operation always have to be followed.

Danger to Life.

1st Test - Start-Up ProcedureTo check the starting sequence, the unit will be operated under no-load condition. To do

this,

contacts A and B at the EB's lamp connector have to be bridged to simulate the lighthead's safety

loop.

Connect EB to 230 V (mains) power supply. The following sequence of events should

occur if theEB operates properly:

- About 0,5 sec after switching ON you should hear the clicking of the contactor K7.- After approx. 3 sec. main contactors K5 and K6 are closed (clicking noise), K7 is

opened

(silent).

- After 1 more sec. ignition contactor K9 will be energized for abt. 0,7 sec(click/click-noise).

This sketched sequence refers to an EB operating properly.

If there is no reaction after switching ON, the following checks have to be conducted :

- Disconnection of EB from power supply und opening up.

- Checking fuses (2 x T6,3 A) on the Mains Board ( see page 14 )- If one or both fuses are blown, Mains Board has to exchanged.

- If the fuses are well, the test "M1,2-6: Check of the Mains Board" has to beconducted.

2nd Test - Outlet VoltagesContacts A and B remain bridged, since for this test EB also has to be operated under


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no-load

condition.A)Measuring of Lamp VoltageSwitch ON the ballast. After start-up sequence has passed, a square-wave voltage of

approx. 310

Veffshould be measured between contacts C and D of EB's lamp connector. Use f.i.digital multimeter

with adequate voltage range or oscilloscope.

WARNING: Mains powered measuring instruments have to be connected ground-freeto the EB.

Otherwise high currents might flow across the ground/earth contact which might

damage EB and/or measuring instruments.

The respective safety rules have to be watched.Basically three different measuring results are possible:

1. U = 310 V :This is the normal outlet voltage.

2. U = 150 V :Defective output bridge, missing half-cycle of lamp voltage.

3. U = 0 V : Unit has switched off electronically. Defects/failures possible in all areas.Result 1. : EB-failure possibly caused by defective lamp cable or lamp head. Replace

lamp headand/or cable by checked-out system. If after this there is no ignition (no ignition noise in

the lamp), lamp's ignition voltage should be checked.

Result 2.

and 3. : Defect(s) in the area of the power modules. At 150 V lamp voltage (2.) at leastone

power module of the output bridge of the LF-Gate Drive Board has failed. At 0 V the

defect might be in the buck-converter as well as in the output bridge.Generally with the results 2. and 3. test "M 1, 2-4 : Power Modules" has to be

conducted.

B) Measuring of Ignition Voltage of the Lamp

Ignition of the lamp happens automatically. Ignition contactor K9 switches the lampvoltage for appr.

0,7 sec. to pin F of the lamp connector. This voltage can be measured with an

oscilloscope (ground

free!!) between pins F and D (= reference point, "Llow").

Digital multi-meters are not particularly apt for this measurement, since lamp voltage

applies only for

abt. 0,7 sec., and most multi-meters need a longer time to indicate a value.Another method of measuring can be to connect a 230 V incandescent lamp (max 40 W)

between pin Fand D of the lamp connector of the EB. This incandescent lamp then has to be lit for abt.

0,7 sec after

EB has been switched ON.

If there is no ignition voltage, although the output voltage between C and D is correct,

then the ignition resistors (2 x 47/5W) on the LF-Gate Drive Board are defective andhave to be changed.


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A possible cause could be a defective igniter of the lamp. The respective light head

should be seriouslychecked by all means, to avoid repetitive damage of this or other EB's.


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Measuring Instructions M 1, 2 - 3Failure of the Mains Curcuit BreakerThe Mains Curcuit Breaker is tripping, if the EB is operated on Line voltage > 270 Veff

or aninternal short circuit causes an exceeding mains current.The following measurements should be conducted at the EB for identification of the

failure.

- Disconnect EB from power supply and switch on Mains Circuit Breaker. ConnectOhmmeter

between the contacts of the EB's Line plug. If there is a short circuit at the power

supply side of the EB,then the varistor on the Mains Board (see page 14) has to be

exchanged.- This varistor has been installed for a sole purpose: to protect the EB from overvoltage.A

damaged varistor therefore generally indicates, that the EB has been operated with

overvoltagefrom the power supply side.

- If there is no short circuit at the mains plug to be detected, the unit has to be opened up,

and

at first a multi-meter(diode testing range)-test has to be conducted between the flatconnector X10 and X12 of the Input Rectifier (see page 16).

- If the multi-meter shows conducting/passage state of the diode in one direction, and

"OL" in the opposite direction, the mains rectifier is defective and has to be changed.- In any case an additional test "M 1, 2 - 4: Power Modules" should be conducted.

- If there is passage state of the diode in both directions, there is a short circuit at the

DC-side

of the mains rectifier; test "M 1, 2 - 4 : Power Modules" is required.- If the multi-meter show "OL" in both directions, test "M 1, 2 - 4 : Power Modules"has to

be the next step.


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Measuring Instructions M 1, 2- 4Test Power ModulesWARNING: Electronic Ballasts do not operate separated from mains. Measuring

instruments

therefore always must be connected ground-free. There might apply line voltage atcontacts or connections of the EB. The necessary safety rules for this type ofoperation alwas have to be followed.

Danger to Life.

For the checks described hereafter, the power supply of the output stage should bedisconnected

from the mains power supply input.

This way it is possible to inspect all control signals and electronic voltages inside of the

EB withoutcausing further damages to the EB.

In any case, prior to disconnecting the power modules, the DC-voltage at the input

capacitors has tobe checked. The multi-meter has to be connected to testpoints P5.Y1 and P5.Y2 (see 17;

screw

contacts of the Capacitor Board).

Ifvoltage is > 0 V , the input capacitors have to be discharged (f.i. with incandescentlamp

230V/40W or resistor 1k/ 20W connected to the testpoints P5.Y1 and P5.Y2).

The disconnection from input power supply is achieved the easiest way by pulling off

cables from flatconnectors P4.X8 and P4.X9 on the Mains Board (see page 14).

After this disconnection the input capacitors will not be charged anymore. Power supply

passage isinterrupted.

CAUTION : A protection circuit on the Control Board stops the drive of the HF

converter, if theinput capacitors are discharged.

To conduct the following test, one end of a diode (1N4148) has to be soldered off from

the controlboard. This is marked on page 12. From serial No. 0121001895 it is realized with a

jumper.

1. Test of the Power Transistors (Power-FETs IRFP 450 and IGBTs GT50J101)

Always the internal free-wheel diode of the FETs and IGBTs is checked. The multi-meter

is switchedto the Ohm-range, especially tuned in for diode measuring, and connected to drain and

source of

the FETs, respectively collector and emitter of the IGBTs.All IGBTs of the output bridge (see page 15, LF-Gate Drive Board) have to be checked,

and also

the 3 FETs of the HF-converter (see page 16, HF-Gate Drive Board).Philips Multimeter PM will f.i. show the following values:


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FET IRFP 450, not damaged: appr. 490in one direction "OL" in the opposite direction.

FET IRFP, 450 damaged: Short circuit (appr. 2...3) or "OL" in both measuringdirections.For the IGBTs GT50J101 there are similar values.

It goes without saying, that multimeters of other manufacturers are apt for this test. Thecorrect

Ohm-value then has to be evaluated by measuring a FET or IGBT which works properly.

2. Test of the Free-Wheel Diodes (BYT 30 PI 800)

The free-wheel diode of the HF-Gate Drive Board (BYT 03 PI 800) is tested on the sameway as the

FETs are tested (see page 16).

Philips Multimeter PM will f.i. show the following values:

BYT 30 PI 800, not damaged : appr. 450in one direction, "OL" in the oppositedirection.

BYT 30 PI 800, damaged : Short circuit (appr. 2...3) or "OL" in both measuring

directions.If defective power-FETs, IGBTs or damaged free-wheel diodes are detected, therespective

semiconductors have to be changed. In any case the base drive pulses have to be checked.

This is theonly way, to prevent repetitive damage of the power semiconductors, in case f.i. there is a

fault in the

gate drive circuit.

3. Test of HF-Gate Drive Board

To check the drive signals, the EB also has to be operated under no-load condition, with

the power

supply internally disconnected. Bridging of contacts A and B of the lamp connector alsohas to

remain.

On the HF-Gate Drive Board there are 3 LED, who indicate the working conditions of theboard.

(see page 16).

- LED1 (red) : Failure on the HF Drive Board, normally not lit.

- LED2 (green) : Operating voltage supply okay, when lit.- LED3 (yellow) : Drive signals of the IRFP 450 okay, when lit.

If LED2 is not lit, the test "M1, 2- 6 : Check of the Mains Board" has to be performed.

If the Mains Board works well, the HF-Drive Board has to be exchanged.

If LED3 is not lit, the test "M1, 2- 7 : Check of the Control Board" has to beperformed.

If the Control Board is ok, the HF-Drive Board has to be exchanged.

After fixing possible failures or exchange of defective boards the drive signals of the 3FET IRFP

450 have to be checked with an oscilloscope. Measuring points are gate and source at

each FET(see page 16). There has to be a square wave (FET on = 13V, FET off = 0V, frequency


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20 kHz,

switch on time abt. 95%) to be measured.Fig. 4.1 shows that signal.

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