Liebert 1000kVA Transfer, Module N Off, Line, Inverter, Nonsynchronized, Reverse Power, Blown

Operation

Table 9	Alarm messages - meaning and corrective action (continued)
Alarm			Cabinet	Special
Message			Location	Functions	Meaning and Corrective Action
UPS SYSTEM (Cont’d.)
					The load on the UPS has exceeded the current versus time window of
Overload			SCC	D, F, L, S	system overload capacity. The UPS system transfers the load to bypass.
					Reduce the load. If the system does not initiate an automatic load
Transfer
					retransfer, manually retransfer the critical load from the bypass line to the
					UPS. Reset the alarm.
			SCC	S	An alarm message (see lists in SCC and module remote monitor
Module Summary					indications and Other alarms that activate summary alarms in 3.2.6 -
					System Configuration Screens) or the watchdog timer has activated the
Alarm			MMU	R
					Module Summary Alarm.
					Clear alarm conditions, if possible.
Module N Off			SCC	D	The output circuit breaker of Module N is open. The number N will identify
					the module (1 through 6).
Line			MMU	R
					Review active alarms at Module N and clear alarm conditions, if possible.
					Inverter output is not synchronized with the UPS system critical bus. This
Inverter					also means the output circuit breaker is open and should not be closed
			MMU	—	until the output is in sync. This condition may correct itself. If not, shut
Nonsynchronized
					down the UPS module and then perform a start-up procedure.
					Contact Liebert Global Services if condition persists.
					The UPS output current has exceeded 175% of the rated full load or the
Overload					overload capacity has been exceeded. The UPS module is taken off-line
			MMU	D, F, L, S	and shut down.
Shutdown
					Contact Liebert Global Services at once. Do not attempt to reset circuit
					breakers.
					Excessive reverse power flow from the critical bus into the UPS inverter
					has occurred, probably because of low inverter output voltage or a phase
Reverse Power			MMU	D, F, L, S	mismatch. The UPS module is taken off-line and is shut down.
					Contact Liebert Global Services immediately. Do not attempt to reset
					circuit breakers.
					At least one of the fuses has opened or a rectifier fault was detected. UPS
Rectifier Fuse			MMU	D, F, S	module is taken off-line and is shut down.
Blown					Contact Liebert Global Services immediately. Do not attempt to reset
					circuit breakers.
					At least one of the fuses has opened or an inverter fault was detected.
Inverter Fault			MMU	D, F, S	The UPS module is taken off-line and is shut down.
					Contact Liebert Global Services immediately. Do not attempt to reset the
					circuit breakers.
Communication			SCC	S	The COM FAIL status message is as important as an alarm message.
Failure					Refer to 3.2.14 - Alarm and Status Messages.
					The optional Battery Cycle Monitor can retain information about the last
Battery Cycle					132 battery discharge events. When the storage buffer approaches its
			MMU	D, S	capacity, this warning message is broadcast via terminal and modem
Buffer Warning
					communication channels and a complete listing of all records is sent to
					the terminal port. The message clears after 30 seconds.
					Battery self-test can be enabled from System Options screen. For test to
					start, the following conditions must be valid:
					1. No Battery Overtemp Alarm must exist.
					2. Battery input and output circuit breakers must be closed.
Battery Exercise			MMU	—	3. All three input volt phases must be within nominal range (+10%, -20%).
					4. DC volts must be greater than (DC Ref) -20V. For a 540 bus, the
					nominal float voltage for 240 cells (the DC voltage reference setting) the
					DC voltage on the battery must be greater than 520VDC.
					5. Battery charge must be greater than 90%.
					6. Load must be greater than 15%.
Table 9 Abbreviations
D = auto-dial;		L = latches
E = logs 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

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