Failure mode impact studies and LV system commissioning tests Technical review on UPS power distribution of the LHC Beam Dumping System N.Magnin - 20.06.2012

Failure mode impact studiesand

LV system commissioning tests

Technical review on UPS power distribution of the LHC Beam Dumping System

N.Magnin - 20.06.2012

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Outline

• LBDS components - Powering summary• LBDS diagnosis systems• Expected power failure impact• Commissioning tests• How to perform commissioning ?• When to perform commissioning ?

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LBDS componentsPowering summary (1)

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Systems MAIN UPS-A UPS-B Function15 MKD HV PS X LBDS operation15 MKD PLC X LBDS operation15 MKD PTU X LBDS operationLBDS MASTER PLC X LBDS operationTFO-A X LBDS operationTFO-B X LBDS operationRTU-A X LBDS operationRTU-B X LBDS operationTSU-A FEC X LBDS operationTSU-B FEC X LBDS operationTSI FEC X X LBDS operationBETS FEC X X LBDS operation

IPOC - TSU FEC X X LBDS diagnosisIPOC1 - MKD FEC X LBDS diagnosisIPOC2 - MKD FEC X LBDS diagnosis

(Suggested powering after LS1)

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LBDS componentsPowering summary (2)

1. EN/EL circuit-breaker.

2. 4x LBDS UPS-A circuit-breaker.

3. LBDS MAIN circuit-breaker.

4. LBDS UPS-B circuit-breaker.

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EN /EL

U PS-BU PS-A

LBD SM AIN

LBD SU PS-B

LBD SU PS-A

1

LBD S CO M PO N EN TS

432

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LBDS diagnosis systems (1)

SCSS (WinCC):– Checks all redundant signals for presence

(Triggers and Re-triggers).– Surveillance of Main and UPS power presence.

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TSU - FESA:Checks the status of internal TSU registers.(Detected clients,BRF presence,PLL locked, etc…)

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IPOC - TSU:Checks signals at input and output of TSU for presence and correct synchronisation.

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IPOC - MKD:Checks MKD current waveforms for correct strength and synchronisation.

Synchronous trigger

Asynchronous trigger(Switch erratic)

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XPOC:• BTVDD: Shows beam position on TDE.• BLMs: Show beam losses during extraction.• BPMD: Shows beam position in extraction line.

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Expected power failure impact1 - Main failure

• Expected scenario:1) LBDS MASTER PLC detects MAIN failure.2) LBDS MASTER PLC issues an internal

dump request to TSU cards.3) Synchronous dump executed before MKD

generator voltages reach their tracking limits (BETS/SCSS).

•Expected result: Synchronous dump•Missing diagnosis systems :

- NONE!

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Assessment of correct LBDS behaviour: OK

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Expected power failure impact2 - UPS-A failure (a)

• Expected scenario a):1) LBDS MASTER PLC powers off.2) Safety link to TSU is broken

= TSU internal dump request.3) Synchronous dump executed before

MKD PTU and generator voltages reach their tracking limits.


- IPOC1-MKD- TSU-A registers- SCSS (WinCC)

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Expected power failure impact2 - UPS-A failure (b)

•Expected scenario b):1) TSU-A powers off.2) TSU-B detects TSU-A problem

= TSU-B internal dump request.3) Synchronous dump executed before



- IPOC1-MKD- TSU-B registers- SCSS (WinCC)

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Expected power failure impact2 - UPS-A failure (c)

• Expected scenario c):1) TSU-A detects power failure

= TSU-A internal dump request.2) Synchronous dump executed before



- IPOC1-MKD.- TSU-A internal statuses.- SCSS (WinCC)

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Expected power failure impact3 - UPS-B failure

• Expected scenario:1) TSU-B detects power failure

= TSU-B internal dump request.2) Synchronous dump executed.

•Expected result: Synchronous dump

•Missing diagnosis systems :- IPOC2-MKD.- TSU-B internal statuses.

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Expected power failure impact4 - TOTAL failure

•E xpected scenario:1) TSU-A/B detects power failure

= TSU internal dump request.2) Synchronous dump executed before



•Missing diagnosis systems :- ALL ! (But XPOC in REMOTE with BEAM)

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Systems MAIN UPS-A UPS-B Function15 MKD HV PS X LBDS operation15 MKD PLC X LBDS operation15 MKD PTU X LBDS operationLBDS MASTER PLC X LBDS operationTFO-A X LBDS operationTFO-B X LBDS operationRTB-A X LBDS operationRTB-B X LBDS operationTSU-A FEC X LBDS operationTSU-B FEC X LBDS operationTSI FEC X X LBDS operationBETS FEC X X LBDS operation

IPOC - TSU FEC X LBDS diagnosisIPOC1 - MKD FEC X LBDS diagnosisIPOC2 - MKD FEC X LBDS diagnosis

Assessment of correct LBDS behaviour: BAD !

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Expected power failure impact5 - Shortcut in TSU crate (+12V)

• Expected scenario:1) TSU-A/B detects power failure

= TSU internal dump request.2) Synchronous dump executed.


•Missing diagnosis systems :- NONE

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Commissioning tests Tests already performed - Main failure

Tests performed locally at Point 6 in 2006.

LBDS-MAIN circuit-breaker has been opened manually.

Resulted in a synchronous dump.

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EN/EL

UPS

LBDSMAIN

LBDSUPS-A

LBDS COMPONENTS

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Commissioning testsTests already performed – UPS failure

Tests performed locally at Point 6 in 2006.

Four LBDS UPS circuit-breakers have been opened manually ‘at the same time’.

Resulted in a synchronous dump.

Is it representative of a real UPS failure ?

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EN/EL

UPS

LBDSMAIN

LBDSUPS-A

LBDS COMPONENTS

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Commissioning testsTests foreseen for end of LS1

• MAIN failure:– Already done in 2006.

• UPS-A failure:– Already done in 2006 (manually = not real UPS failure ?).

• UPS-B failure:– Never done so far !

• UPS-A + UPS-B failure– Never done so far !

• TOTAL failure (Main + UPS-A + UPS-B)– Never done so far !

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How to perform the commissioning LOCAL or REMOTE ?

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CONS:•We need to arm LBDS:- Close BIS loops.- Close LASS.- Arm BETS (connect BETS-Simulator).•Test with beam is not possible !•Cannot be done on regular basis.•...

PROS:• Tests performed from 450 GeV to7 TeV.• Team on site in case of LBDS problem.• ...

LOCAL commissioning at Point 6: REMOTE commissioning from CCC:

PROS:• Test with pilot beam at 450 GeV is

possible.• Check LBDS with external diagnosis

systems (XPOC).• Arming of LBDS is easy.• Could be done on a regular basis.• ...

CONS:• How to cut/re-establish power

remotely ?• Tests at 7 TeV not possible.• Access needed in case of LBDS

problem.• ...

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How to perform the commissioningProvoke TOTAL power failure ?

1. By-Pass mode for both UPS.

2. Opening of EN/EL Circuit-Breaker.

Impact of total power loss on other LHC equipment ?(Cryogenics, QPS, Vacuum, BIS, …)

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EN/EL

UPS-BUPS-A

LBDSMAIN

LBDSUPS-B

LBDSUPS-A

1 1

2

LBDS COMPONENTS

Is this possible in REMOTE mode ?

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How to perform the commissioning Assess correct LBDS behaviour

• We need the most important diagnosis FECs:

– IPOC - TSU:• Check for correct TSU card behaviour.• Check LBDS synchronisation with beam.

– IPOC - MKD:• Check for correct MKD strength.• Check for correct MKD synchronisation wrt each other.

Þ We need power for at least these two important diagnosis FECs.Þ We need power for the network infrastructure.

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Do we need a special power feed for diagnosis FECs & IT equipment ?(At least in case TOTAL failure test is feasible)

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How to perform the commissioningEN/EL modifications needed ?

- Insert new circuit-breakers ?(Temporarily / Definitively ) ?

- Remote control of circuit-breakers ?

- Powering of diagnosis FECs from upstream of new circuit-breakers ?

- …

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EN /EL

U PS-BU PS-A

LBD SM AIN

LBD SU PS-B

LBD SU PS-A

LBD S CO M PO N EN TS

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When to perform the commissioning

• Must be done at the end of LS1 !– We will have all LOCAL conditions to arm LBDS.– Test procedure to be defined...

• Should we do it on a regular basis ?– Should we do it at the end of every WS ??

- LOCAL ? / REMOTE ?

– Should we do it at the end of every TS ???- REMOTE ?

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Documents

Failure mode impact studies and LV system commissioning tests Technical review on UPS power distribution of the LHC Beam Dumping System N.Magnin - 20.06.2012