Failure mode impact studies and LV system commissioning tests Technical review on UPS power...

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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Failure mode impact studies and LV system commissioning tests Technical review on UPS power...

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