RECOVERY FROM CATASTROPHIC POWER FAILURE PROCEDURE

TM 9-6920-737-10

RECOVERY FROM CATASTROPHIC POWER FAILURE PROCEDURE

In the event of an external power failure or operator-initiated emergency electrical shut-down (see 2-214), the main circuit

breakers in the Computer and Integration Shelters will trip automatically. The air conditioners, normal lighting, and

electronic equipment will go off. Battery operated emergency lights will turn on automatically and the Fire *Control Panel

system trouble alarm will sound. Operation cannot be resumed unless external power is restored and the main circuit

breakers are manually reset. To restore operation after a catastrophic power failure, perform the following procedure.

WARNING

Do not remain in shelters with all doors and vents closed unless at least one air conditioner blower is operating.

Suffocation can result from lack of fresh air. If external power is off for more than five minutes, clear the shelters of

personnel until operation is restored.

NOTE

If external power is not restored within two hours, notify organizational maintenance. Emergency light batteries may

totally discharge after two hours of operation and you may not be able to power up the system due to battery discharge

within the Fire Control Panel.

In Computer Shelter at AC Power Line Protection Panel (1), make sure that three green indicator lamps (2) are

or come on when external power is restored.

NOTE

To reset circuit breaker after it has tripped, the toggle must be pulled firmly to the OFF position until it clicks, before

resetting to ON.

(deleted)

In Computer Shelter, at Utility Power Distribution Panel (5), set all ten circuit breakers (6) to OFF.

Reset main circuit breaker (7) to ON, and then set all ten circuit breakers (6) to ON, one at a time. Close panel

door.

4.1

In Integration Shelter, at Utility Power Distribution Panel (7A), opens door and reset Main circuit breakers (7B) to

ON. Close panel door.

In Trainer Shelter, at Fire Control Panel (8), make sure SYSTEM TROUBLE indicator (9) and audible alarm go

off

and only the AC ONE indicator (10) lights green. If AC ON indicator (10) does not light, or if any of the other

panel indicators are on, leave the shelters and notify organizational maintenance.

Change 1 2-210