acting on electrical p ower for MEYNA ExperimentsBarracks PLC TYPE AND FUNCTION PLC SCHNEIDER of type TSXNANO TSX07 312422 out of production by SCHNEIDER Installed by EL at the end of the 90s ID: 316970
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Slide1
PLC NANO MANAGING SAFETY FUNCTIONS
acting on electrical
p
ower
for
MEY/NA Experiments/BarracksSlide2
PLC TYPE AND FUNCTION
PLC
SCHNEIDER
of type TSX-NANO (TSX-07 312422), out of production by SCHNEIDERInstalled by EL at the end of the ’90’sIt manages safety inputs, such as FIRE, GAS, TEMPERATURE and AUL to cut the power of the Experiment and/or its barracks and/or its clim, based on the logic below:
08/10/2012
S. Infante on behalf of EN/EL
2
/7Slide3
Some photos
08/10/2012
S. Infante on behalf of EN/EL
3
/7Slide4
POWER CUT OF ALPHA EXP.
After the power cut of ALPHA Experiment (
193 - AD
Complex) on the 28/07/2012, due to failure of a PLC NANO, a MERI was issued (EDMS 1234142) and the incident discussed during a TIOC meeting.The Group EL clarified that, although the PLC’s
had been installed by EL based on Users request at the time, they are are not EN/EL responsibility, nor within EL competences and mandate.
08/10/2012
S. Infante on behalf of EN/EL4/7Slide5
NUMBER OF PLC installed
An
inventory
has been done by EL in the mean time. 21 PLC’s of this type have been found in Meyrin and North Area experimental areas:
3 in AD
2 in West Hall7 in East Hall
1 in nTOF3 in EHN15 in EHN208/10/2012S. Infante on behalf of EN/EL
5
/7Slide6
Current situation
By a visual
inspection
of the installations, it has been noted that the majority of inputs are bridged (Temp, Gas,..) and some are not even cabled.In West Hall 2 PLC’s
still running could be dismantled since all inputs are bridged (no more beam lines).
2 versions of PLC software programs have been found (with a minor variant between the 2 programs).
A general PLC electrical drawing exists, that would need to be crosschecked for each installed PLC (to mark what is really cabled and what it is not).08/10/2012
S. Infante on behalf of EN/EL
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/7Slide7
Common approach for all PLC
Due to the obsolescence of the
material, the installation and the difficulty to have PLC
NANO spares, all PLC’s will have to be replaced In the mean time the 2 PLC in WH could be removed and kept as spareThe visual inspection in the PLC rack proved that a
risk analysis should be re-evaluated for each installation, to know exactly what information should cut the power of an Experiment and its barracks.
Extreme difficulty we’ve found so far to know who to contact to bring up this issue (Facility M
anager, Infrastructure Responsible, Experiment Responsible, TSO’s, DSO’s, HSE, GS-ASE, EN-MEF,…).Who will have to take care of this upgrade has to be clarified!08/10/2012
S. Infante on behalf of EN/EL
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