Safety Instructions For The Auxiliary Services Board - ABB PVS-120 Hardware Manual

12 Safety instructions
e. Turn the disconnecting switch of the MV transformer side of the MV switchgear to
open position. Lock and add a warning notice.
f. Disconnect the MV switchgear from the MV network (all possible external power
supplies, grid and parallel stations). See the User's manual of the MV switchgear.
Lock and add warning notices.
4. Check that all shrouds/screens are in place.
5. Check that you are not near to any live parts while working. All live circuits must be
protected with shrouds/screens.
6. Make sure that the MV switchgear is dead.
• Check the status of voltage indicators in all MV switchgear bays. Note that all phase
LEDs which were switched on AC cabinet at step 3 are now switched off).
7. Earth the MV switchgear and AC cabinet.
• Turn the earthing switches of the MV switchgear to "earthed" position, lock (remove
the MV switchgear Ronnis key of the V module) and add warning notices. If the
station is connected to parallel stations, make sure that you also turn the appropriate
earthing switches of the parallel stations to "earthed" position.
• Temporarily, ground the MV switchgear terminals at all possible external power
supplies (grid and parallel stations). See the User's manual of the MV switchgear.
Lock and add warning notices.
• Ground the inverter AC sides with appropriate temporary grounding set.
8. Check that the MV transformer is dead (high voltage terminals, low voltage terminals,
any auxiliary power, and instrumentation). Use an appropriate high voltage tester only
for the high voltage side, and a voltage detector with suitable testing heads for the low
voltage side.
9. Issue a work permit.

Safety instructions for the auxiliary services board

1. Open the main circuit breaker or main switch of the auxiliary service transformer, and
secure by locking and tagging.
2. Open the secondary circuit breaker of the auxiliary service transformer, and secure by
locking and tagging.
3. Open all switches, breakers and connectors of the auxiliary service board, and secure
by locking and tagging.
4. Make sure you are not near to any live parts while working. Disconnect the live circuits
or protect them with shrouds/screens.
5. Check the status of the voltage indicators in the auxiliary service board.
6. Check that the auxiliary service board is dead.
7. Issue a work permit.