Liebert Series 600T Input Fail, DC Ground Fault, DC Capacitor, Fuse Blown, Battery CB Open, Power

Table 1		Alarm Messages - Meaning and Corrective Action
Alarm		Cabinet	Special	Meaning and
Message		Location	Functions	Corrective Action in Brackets [ ]
AC INPUT
Input Fail		MMU	—	The rectifier input line voltage is outside of specified limits or the
				input circuit breaker is opened while the battery circuit breaker
				remains closed. The battery supplies power to the critical load
				through the UPS inverter.
DC BUS
DC Ground Fault		MMU	L, S	Either the positive (+) or negative (-) DC bus is grounded. No transfer
				or shutdown occurs.
				[Contact Liebert Global Services at once. Do not attempt to locate or
				repair the fault.]
DC Capacitor		MMU	D, F, S	At least one DC capacitor fuse has opened. The UPS module is
Fuse Blown				taken off-line and the input and battery circuit breakers trip open.
				[Contact Liebert Global Services at once. Do not attempt to reset the
				circuit breakers.]
Battery CB Open		MMU	R, S	The module battery circuit breaker (MBD) is open. This circuit
				breaker can be opened either manually or automatically in a UPS
				shutdown procedure. If the UPS is operating with this breaker open,
				the critical load is not protected from loss of the utility source
				power.
				[After AC power is restored and the DC bus is at 100% operating
				voltage, manually close the battery circuit breaker so the rectifier can
				charge the battery.]
Battery		MMU	R, S	The battery is discharging. This occurs whenever the battery
Discharging				supplies power to the load for more than 5 seconds because of input
				power failure, a rectifier problem, or an overload condition. If the
				input power or a source of auxiliary power is restored to the UPS
				module, the UPS automatically returns to normal operation.
				[Watch the battery voltage carefully. Reduce the load (begin
				controlled shutdown) to extend the battery back-up time. Reset the
				UPS alarms after the input power is restored. The message clears
				after 30 seconds.]
Low Battery		MMU	R, S	The battery voltage is approaching the minimum discharge voltage
Warning				(approximately 5 minutes remaining).
				[Complete the controlled shutdown of the critical load. Reset the
				alarms if the input power is restored before shutdown.]
Low Battery		MMU	D, F, L, S	The battery voltage has decreased to the minimum discharge value.
Shutdown				The UPS module is taken off-line (no power to the critical load)
				and the battery and input circuit breakers trip open.
				[Perform a UPS system start-up procedure when AC power
				becomes available.]
DC Over-Voltage		MMU	D, F, L, S	The maximum preset value of the DC Bus voltage has been
Shutdown				exceeded. The UPS module is taken off-line and the input and
				battery circuit breakers trip open.
				[Contact Liebert Global Services at once. A fault may have occurred
				within the UPS. Do not attempt to reset the circuit breaker.]
BYPASS
Load On Bypass		SCC	D, E, F	The critical load is being supplied power from the bypass line, and is
				therefore exposed to utility power disturbances.
				[Clear all of the alarms before attempting to retransfer the load from
				the bypass line to the UPS.]
Table 1 Abbreviations
D = auto-dial;	L = latches
E = reports only;	R = remote
F = freezes;	S = summary

D* = auto-dial initiated by Auto Transfer to Bypass if load is on UPS when alarm occurs

D# = auto-dial initiated through Module N (1-6) off-line

70	Operation	DISCONTINUED
		PRODUCT