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CAMAC PROTECTION SYSTEM FOR THE 8816 EXTRACTOR TANK

R.L. Keizer

GENERAL

MAGNET SURVEY BOX

The CAMAC cratePower distribution and e.m. valveEarthfault moduleFast protection module(s)Temperature moduleSumfault modulePulse counterCrate wiring diagram and earth pointsN

MN

MN

NM

Nm

am

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I

DIAGNOSTICS

3.1. Interpretation CAMAC modules3.2. STAR output

CABLE CONNECTIONS

. Connections between tank and MAGNET SURVEY BOXh.lh.2 Valve control cable and power cable 'h.3. Magnet fault cables

MODES OF OPERATION

5.1. Operation in the CENTRAL HALL BUILDING5.2 Operation with the test power supply

SPARE COMPONENTS

REFERENCES

1. GENERAL

A block diagram of the extractor tank SSl6 is shown in Fig. 1.

Only the elements mounted on or inside the tank are shown. The test

stand in Hall 167 is equipped with the complete set of interlocks,

while in the ring only the Water flow, i.e. minimum inlet

pressure and maximum outlet pressure,form part of the CAMAC protection.

The complete layout, including the power supplies and various

junction boxes, is shown in Fig. 2. The MAGNET SURVEY BOX forms1)

Section 2. The same system with minor modifications is used for

the control part of the protection system and is described in

the septum tanks in other straight sections and in the BOOSTER

TRANSFER LINE.

The Section DIAGNOSTICS summarizes the functioning of the various

CAMAC modules and then gives briefly the counter measures to take in

case a given warning signal flashes on.

2. MAGNET SURVEY BOX

2.1 The CAMAC crate (Model CM 302540)

The dimensions of the crate are 3 units of height

(3 x 44.4 mm) by 24 + 1 units of width (25 x 17.1 mm)by 460 mm. The crate contains the modules specified in

Table l. The crate is shown in Fig. 3.

TABLE 1 _ The content of the various CAMAC crates

DESCRIPTION OF THE MODULE 8816 ES T-SVl T-SV2 TI-S

Earth Fault module, 2 units of width

Fast Protection, 3 bridge, 4 units of width 1" l0

Fast Protection, 2 bridge, 2 units of widthTemperature module, 2 units of widthSum Fault module, 2 units of widthPower module, 1 unit of widthPulse Counter H

+4H

\»F

‘IJw

H+4

a

F‘F1

m

F‘F‘

H

F4F‘

H

All the connections are made on the rear panel. The input

signals are received via the STATUS TANK plug but provision is made

for special cases where the signals do not come directly from the

TANK JUNCTION BOX: In this case the TUGHEL connectors are used.

On a strip inside the crate are mounted a stabilised : 15 V

DC supply, an unstabilised 48 V DC supply, a magnetic valve relay

and a pulse counter (8816 only).

2.2 Power distribution and em.valve

The electrical circuit is shown in Fig. 4. The position

and the outlay of the POWER UNIT PANEL is shown in Fig-5 "

on the extreme right.

The POWER UNIT controls the mains supply (switch s1) to thepower units : 15-V and 48 V. The thermal fuses O1 and 02 are

mounted on the rear panel.

With switch 32 a LAMP TEST may be carried out which tests all

signal lamps except those for the DC power supplies (: 15 V and 48 V).

Switch S3 either activates a PLUG TEST (left) or shows whether

the MAGNET CURRENT is on (right). The PLUG TEST checks whether the

LONG STATUS CABLE, which connects the TANK JUNCTION BOX and MAGNET

SURVEY BOX (Fig. 2), has been plugged in on both sides.

The DC power supplies M (48 V) and L1’ L2 (i 15 V) are shownin Fig. 4 and Fig. 5 respectively.

The MAGNETIC VALVE RELAY controls the 48 V, 400 mA VANELEC

valve which interrupts the cooling water supply to the magnets

in case the vacuum deteriorateS'MJalevel, 10—4 Torr, at which

the ion pumps will switch off.

2.3 Earth fault module

An EARTH FAULT module is shown in Fig. 6. Since all power

supplies are earthed via an earth fault protection, it is possible

to test the insulation between the electrically insulated magnet

core and the coil.

_3-

In case of a short-circuit, which exceeds 200 ms in duration,

relay B is activated and relay A, the memory relay, is released.

0n the front panel (see Fig. 3), the red signal lamp is switchedon and an EARTH FAULT signal is transmitted to the SUM FAULT

module.

The test voltage, 24 V DC plus the voltage of the corresponding

power supply, never exceeds 100 V.

With the push-button marked TEST the correct functioning ofthe EARTH FAULT and SUM FAULT modules may be checked. This switch

simulates an insulation failure. The module is reset by applying

the green push—button marked RESET on the SUM FAULT module. Since

the magnet cores are isolated from the earth, it is possible to run

the magnets, in case of a short circuit between coil and core, without

the earth fault protection. Inside the SUM FAULT module, a switch

is provided which will inactivate all earth fault protection.

The red earthfault signal lamp on this module will be permanently

switched on as a reminder that the protection is temporarily switched

off.

2.4 Fast protection module(s)

General — A Wheatstone bridge is formed by two windings in

series (external half—bridge) and the complement (internal half-

bridge) in the fast modules , (see Fig. 7). The sensitive elementis a polarized relay.

The FAST PROTECTION thus provides a relative measurement of

the temperature and protects in case of open or short—circuit

in the coil.

The $816 magnets are pulsed, 20 ms rise time with theSP61 power supply, with pulse lengths up to 1000 ms. The

Booster magnets are all DC. On the flat top the current in

the polarized relay is given by

_4_

where k is the ratio of the electrical resistance of the two

windings. If the difference is caused by an average temperature

' 'fidifference of AiCu

_. '_m'k—l+dAiCu

for copper the thermal coefficient of resistivity is 0.00400-1.

The sensitivity of the bridge then will be

1 1H3 1AT : °’ R + 2R A/OC

Cu 2 3

For maximum sensitivity R2 + 2R3 should be a minimum, hence

a relay with a low coil resistance has been chosen. The minimum

value of R2 is determined by the condition that the current in

the bridge be small compared with the magnet current. All the magnet

‘protection systems have been designed with a maximum sensitivity

of N 0.14 mA/OC (or 12.500 temp. difference with relay AYLZ 7300-100).

R2 is determined by the condition that the current in the bridge

is small (5 0.10/00) compared with the magnet current. All magnet

protection systems have been designed with a maximum sensitivity of

0.14 mA/OC or 12.500 temperature difference for relay AYLZ 7300—100.

To protect a 2-turn magnet it is necessary to have one bridge

plus one thermocouple, the latter for the absolute measurement.

For a B—turn magnet two bridges are necessary. The resistance of 50 Q

parallel to the centre winding will weaken the magnet current by

approximately 0.8 10-2 o 00.

Since the magnets are pulsed dynamic balancing should be possible

with, see Fig. 7, the 2nd 5-turn magnet

R

l—‘

However eddy current effect$ play a dominant role and the balancing

of these bridges becomes a complicated procedure. Therefore no dynamic

balancing has been provided but the time constant has been increased

by placing a capacity (Figs. 8,9) across the relay (Le time = 60 msfor 500 H F). In order to protect the sensitive relays the bridge

is short-circuited for voltages > 500 mV by two diodes.

Balancing procedure

Sensitivity adjustment

— Turn the sensitivity potentiometers fully anticlockwise

(i.e. sensitivity is minimal)— Switch on the magnet power supply

— Monitor bridge voltages with a scope with differential input

— Adjust zero‘s~ Repeat preceding cycle with increasing sensitivity.

The bridge is now adjusted and the sensitivity will be about 23 mV/OC

or 0.14 mA/OC. The relay will trigger when the average temperature dif—

ference is 12.500. The shape of the bridge voltages, with 20 ms and

30 ms respective pulses, in the 8816 extractor is shown in Fig. 10.

In order to check the functioning of the unit, proceed in the

following way

— Adjust sensitivity .

— Turn zero clockwise. The unit should trigger at roughly + 23 mV

- Turn zero anti-clockwise. The unit should trigger at roughly - 23 mV

If the triggering is not symmetric about zero, the contacts

on the relay should be adjusted or the bridge should be set at

the average of the two readings. For instance, for triggering

at +40 mV and -10 mV, the zero position should be at +15 mV

for normal operation.

2.5 Temperature module

The TEMPERATURE module measures the absolute value of

the temperature with a time constantof 500 to 1000 ms.

The circuit is shown in Fig. ll. The sensitive element

is a cu-constantan thermocouple type THERMOCOAX 0.8 mm diameter.

The two thermocouple wires are electrically floating. The thermo—

couple output is amplified 100 times. The time constant of the

amplifier, 500 ms, has been chosen much longer than that of

the ambient noise, so that no common mode rejection is necessary.

With the BALANCE potentiometer (intern) the zero is adjustedas follows

~ Short circuit the input or connect thermocouple. The

magnet should be switched off in the latter case.

m Measure between output amplifier (1) and ground (2).

The output voltage should be less than 5 mV.

The TEffl button has been provided to check whether the

thermocouple has been connected and whether in that case the

TEMPERATURE module will trigger if the setting is at a vdue

be10w AT = 50°C.

— Turn LEVEL potentiometer at least 20 times anti—clockwise.

Thereafter rotate four times in clockwise direction.

If the RED pilot light on the TEMPERATURE module is on,

push the RESET button on the SUM FAULT module. The light

will now disappear.

— Push the TEST button, the red light will switch on only if

the thermocouple is connected.

The triggering level should be adjusted the following way :

— Obtain the reference point AT = 50°C by

(a) Turn the LEVEL potentiometer at least 20 times clock-

wise (high setting). The voltage difference measured

between (1) and (2) (Fig. 11) should be 200 mV, and(b) with the TEST button pushed in, turn slowly anti-clock-

wise until the unit triggers, i.e. the RED pilot

light switches on.

— Obtain correct level setting by :

(a) Turn in clock—wise direction if AT should be more

than 50°C, add 50°C per turn, and

(b) for AT <5o°c turn in anti—clockwise direction,subtract 5°C per turn.

If it is necessary to measure the temperatureincrease,

the following steps should be undertaken :

— With a voltmeter connected to (l) and (2), the zeroshould be adjusted with cooling water running but the

poWer switched off.

— With thenagnetunder p0wer, the voltmeter reading isproportional to the temperature difference, sensitivity

4 mv/°c.

2.6 SUM FAULT module

The SUM FAULT module is shown in Fig. 12. The system

»provides inputs for up to seven interlock signals which

should obey the following codel)

(1) N0 warning if input impedance is low.

(2) If the impedance is a: an output signal MAGNET FAULT

is produced.

' For each interlock signal is provided : one relay (A to F),one signal lamp and one STATUS STAR output. All interlock

signals of one kind are connected in series to form, for instance,

one TEMP or one FAST signal.

If any one of the input impedances becomes <9 a MAGNET

FAULT is produced (contact e8).

The RESET RELAY (I) forms all the reset signals necessary

to start the CAMAC modules; the possibility of EXTERNAL RESET

exists.

The VACUUM, EMERGENCY, FLOW and PRESSURE interlocks may

be permanently short-circuited at the rear panel of the CAMAC

crate by short-circuiting the corresponding TUCHEL contact.

-8_

It is also possible to work temporarily without VACUUM,

EMERGENCY or EARTH interlocks in cases where the magnets have

to be tested in air or in case of earth fault failure. In

the latter case, the magnets could still run but with less safety.

Inside the SUMFAULT module, switches 81, 82 and SB are

mounted, which will bridge the respective relays, but the

corresponding signal lamps emA,vacC and earth will be switched

on so that one should not forget that the interlock is switched

off.

In case of a VACUUM warning, the MAGNETIC VALVE will be

'closed automatically.

2.7 Pulse Counter

The circuit is Shown in Fig. 13. The counter will accept slow

(t > 50 ms) negative pulses only between 1 V and 5.5 V. The Sodecco

counter is mounted on the rear panel and cannot be reset.

2.8 Crate Wiring Diagram and Earth Points

The crate wiring diagram is shown in Fig. 14. The mains is

earthed near plug P.

The 48 V supply is earthed via the earth protection (Fig. 15)

of the power supply. A second, high impedance, earth point ( 1 MO

resismor) is necessary to make sure that the magnet cores do not

charge up when the cables are not connected.

The i 15 V supplies are nowhere earthed, the thermocouple ampli—

fiers and FAST circuits are floating.

5.1

DIAGNOSTICS

Interpretation CAMAC modules

Table 2 Interpretation CAMAC modules

CAMACMODULE ACTION RESULT INTERPRETATION REF

POWER POWER—SWITCH ON Green i 15 V, 48 V i 15 V, 48 V power SectionUNIT indicator lamps ON supplies OK 2.2

Fig. 4

Indicator lamps OFF Check thermal fuses, Fig. 5mains connection orfuses 15 V DC powersupply

Activate LAMP Test all lamps except Replace burnt-outTEST i 15 V, 48 V lamps

Activate PLUG Green indicator LONG STATUS CABLE isTEST lamp ON connectedswitch in lefthand position

MAGNET CURRENT Green MAGNET CURRENT Magnet power supplyswitch in right indicator lamp ON is switched ONhand position

EARTH Red indicator lamp ON Short circuit bet- SectionFAULT ween core and coil of 2.3UNITSNo. 1 UNIT 1 , 2-turn magnet Fig. 62 and UNIT 2 , first 5—T magnet3- UNIT 3 , second 3—T magnet

try RESET

Activate TEST Red indicator lamp ON Unit functionsunits 1, 2 or 3 Corresponding unit normally

switches ON__________________ i__________-_______._____L_________.._________..___1__________

CAMACMODULE

FASTPROTEC-TIONUNITS3 bridgeand 2bridge

TEMP-ERATUREUNITSl, 2and 3

Table 2 — cont.

ACTION

Balance bridges asdescribed

Adjust sensitivityas described

Activate TESTunits 1, 2 or 3

-10-

RESULT

Unit ready

Hed indicator lamp ON

No.

No.

No.

No.

Unit ready

Red indicator lamp ON

No. 1

No. 2

No. 3

Red indicator lamp ONunit switches ON

Indicator lamp OFF

INTERPRETATION

Section2.4

Overheating or short Fig. 8circuit

2-turn magnet innerconductor

2—turn magnet septumconductororfirst B—T magnetinner conductor,check mon. l, 2 ormon. 2, 5 with100 mV meter

first 5—T magnetcentre conductor

first 3-T magnetseptum conductor

second 3—T magnetinner conductor

second S-T magnetcentre conductor

second B—T magnetseptum conductor

Section2.5

Overheatng of coil : Fig. 11

2—turn magnet

first 5—turn magnet

second 3-turn magnet

unit functions norma-lly, thermocouplenot connected

unit fault or thermo—couple not connected

______________________ .J

Table 2 cont.

SfiMfiC ACTION RESULT INTERPRETATION REF

SUM Activate RESET Green RESET indicator All units OK SectionFAULT with all red lamp ON 2.6UNIT indicator lamps Fig. 12

OFF

Throw switches31 and/or 52nd or Sa / 5

inside the unit

indicator lamp OFF

Red indicator lampsVACUUM, and/orEMERGENCY and/orEARTH are onRESET is stillpossible

One of the red indi-cator lamps is ONmagnet switched OEF

Check SUMFAULT unit

VACUUM EMERGENCY andEARTH interlocks notin for possiblemagnet testing in air

One of the units hastriggered the MAGNETFAULT signal

12 -

5 - 2 sm ,Ol‘EPELt.

A 24 pin AMTHENOL MINIATURE plug has been foreseen on the

rear panel (Fig. 3). The code adapted is that given

by Brehy and Guillaume2). The information is available

in terms of impedance as shown in Table 3.

TABLE 3 — The STATUS STAR Output

PIN DESIGNATION IMPEDANCE ZERO IMPEDANCE m

2 VACUUM Vacuum in tank OK Vacuum pressure > 10-4 Torrem valve in hydraulic circuit oftanks E—S, T—SVl, T-SV2, Tl—S or8816 closed

1 EMERGENCY No emergency Emergency stop

5 EARTH FAULT Insulation OK Short circuit in insulationbetween coil and core in one ofthe magnets

4 FLOW Water flow in hydraulic Insufficient water flow in cor~circuits of tank OK responding tank or water cooled

cable of Tl-S or 8816

3 PRESSURE Inlet water pressure OK Insufficient water pressure incorresponding tank

6 TEMP Outlet temperature OK Water temperature on outletcooling circuit(s) too high

7 FAST Coil temperatures show Overheating or short circuit indifferencgs of less magnet coil(s)than 12.5 C

8 MAGNET FAULT No magnet fault Magnet fault tank E—S, T—SVl,T-SVZ, Tl—S or 8816 (This signalshould appear simultaneouslywith one of the abOVe—mcntionedsignals)

9 MAINS Mains voltage switch of Mains voltage switch is OFFCAMAC crate is ON

10 VALVE Magnetic valve OPEN Magnetic valve CLOSED

11 COMMON — -

-13—

4. CABLE CONNECTIONS

4.1 Connections between tank and MAGNET SURVEY BOX

Inside the tank all connections, except the thermocouples

are made of hard drawn (10% elongation) silver plated copperwire insulated with 4 mm ‘fi ceramic beads. The wires areterminated on the magnet side withBURNDY pins which fit in

corresponding sockets soldered to the coils. To each pin

and socket is soldered a small copper plate with inscriptions

"R", "S", "T" etc. for the FAST connections, and "I1",'T2",

"13"etc. for the EARTH FAULT wires.

The thermocouples are 0.8 mm thick THERMOCOAX cables

with the thermocouples floating electrically.

The FEED THROUGH, SHORT STATUS CABLE(S), TANK JUNCTIONBOX and LONG STATUS CABLES are shown in Figs. 16 and 17.

The TANK JUNCTION BOX forms part of the magnet tank, the

green light shows whether the magnet current is ON and the

EMERGENCY stop is mounted on the lid.

The cables have the following code numbers

E—S Long status cable, code 112045T-SVl Long status cable, code 112045

T—SV2 Long status cable, code 112047

Tl—S Long status cable, code 1120493816 Long status cable, code 112042

The SHORT VACUUM MONITOR CABLE links the vacuum monitor

with the MAGNET SURVEY BOX and is specified as follows :

Table 4 W:_,The SHORT VACUUM CONTROL CABLE

0n the MSB WIRE NUMBER On the VACUUMside : in cable MONITOR side DESIGNATION REFTUCHEL male 2xO.75 mm2 TUOHELS female3-pin 3-pin

l VACUUM Figs 2

not used and 16

2 VACUUM

-14-

In the BOR the VACUUM MONITORS are located as follows

Table 5 Location cine.ylcmzllgrlugas.

Vacuum MonitorVacuum ____m_/V_ 44~77UAE> 7777 <47 _7 f7 >>_ #444474_

InterlockRack Chassis Cable Connector Ref.

E—S 119 02 112065 S7 Fig.3

T—SVl 233 03 112066 S?

T—SV2 233 03 112067 S9

T143 — - 112068 — [

In 8816 the vacuum interlock is not used in the ring.

4.2 Valve control cable and power cable

The VALVE CONTROL CABLE links the MAGNET SURVEY BOX and

the MAGNET TANK and is specified in the following table

Table 6 — The VALVE CONTROL CABLE

On the MSB WIRE NUMBER On the magnetside : in cable tank sideBURNDY male LEMO No. 2 DESIGNATION REF

. 2 .4 p1n 4x1 mm 2 pin

1 l }2 2 male current Fig. 2

3 34 4 } female current and 3

The cables have the following code numbers

E-S valve control, code 112044

T—SVl valve control,code 112046

T—SV2 valve control,code 112048

Tl—S valve control, code 112050

8816 cable not used.

-15-

The POWER CABLE links the MAGNET SURVEY BOX with the mains

and is specified in the following table :

Table 7 — The POWER CABLE

On the MSB WIRE NUMBER On the MAINSside :1 side U

SOURIAU female in cable DESIGNATION RHF7—pin

l ... .1 live 220V mains Fig. 2

~ earth chassisand 5

3 neutral 220V mains

The MAGNET FAULT CABLE links the m.s. box with the

DISTRIBUTION RACK SMlT, SPGI on the TEST control panel.

For the SMlT and PSGI power supply the cable is as follows :

Table 8 — The MAGNET FAULT cable

On the MSB Wire number On the SPGIside : in cable sideBURNDY male DESIGNATION REF

8—pin

l - not used + 48V Fig. 2

2 — MAGNET FAULT and 5used

5 - EXTRACTOR l6

4 - used RESET

5 - EXTRACTOR l6

6 — not used COMMON

7 - POWER SURPLY

8 — mt used EXTRACTOR 16ON

"16..

For the test power supply, the cable connection (Fig. 2)

is as shown in the following table

Table 9_- The TEST SURREY MAC—NET FAULT CABLE

On the MSB On theie$ p.s.

133112131311 female WIRE NUMBER 2:2?01 panel DESIGNATION REF19—pin ”1 °able BURN'DY male '

19—pin

1 1 Fig. 142 2 }WATER FLOW plug T

3 34 4 }MAGNET5 56 6 }WATER TEMP.7 78 8 }VACUUM9 9

10 10 }EMERGENCY11 1112 12 }WATER PRESSURE13 13 }14 14 CURRENT15 1516 1617 17 NOT CONNECTED18 1819 19

5. MODES OF OPERATION

5.1 Operation in the CENTRAL HALL BUILDING

The layout is shown in Figs. 1 and 2.

signals VACUUM and FLOW are not used.

therefore not controlled from the MAGNET SURVEY BOX.

The e.m. valve is

The interlock

-17-

The following steps should be undertaken

— short—circuit contacts 1 and 3 on TUCHELS "VACUUM” and

"FLOW”,

— connect the following cables

LONG STATUS CABLEPOWER CABLEMAGNET FAULT CABLE (to POWER SUPPLY INTERLOCKRESET EXT. (to TUCHEL) CONNECTOR)

5.2 Operation with the test power supply

As shown in Figs. 1 and 2, the full set of interlocks is

used.

The following points are therefore important

— make sure the FLOW SIGNAL is derived from both the

magnet tank and the water cooled power cable,

— connect the following cables

LONG STATUS CABLE

SHORT VACUUM CABLE

VALVE CONTROL CABLE

FOELDI MAGNET FAULT CABLE

6. SPARE COMPONENTS

All the components are standard except the relays in the FAST

module which is of the type

BARBER COLMAN No. AYL7 7300-100

furnished by OMNI BAX GmbH, Zflrich, Tel. 478200, price FrS. 285,-—.

Spare units of each module exist and are obtainable from

R.L. Keizer, CERN.

Each rack containing these CAMAC modules is provided with a

locked drawer with the necessary items, such as fuses, special

cables, etc. to do the necessary adjustments and to carry out

minor repairs.

-18-

REFERENCES

1. For the original layout, see

E. Weisse, controls for the PSB-CPS transfer line,SI/note MAE/70-7, 5.6.1970

2. D. Brahy et C. Guillaume, L'utilisation du STAR acquisitionet controleMrs/co Note 71—1, 4.1.1971

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