72 Operation
UPS SYSTEM (Contʼd.)
Overload SCC
MMU
R, S
S
TheUPS output current exceeds the rated systemload current. This
conditioncauses an alarm only, the UPS does not shut down.
[Determinecause of the overload. Reducethe load until the overload
conditionis corrected. Reset the UPS alarm.]
OverloadTransfer SCC D, F, L, S Theload on the UPS hasexceeded the current versus time window
ofsystem overload capacity. The UPS system transfers the load to
bypass.
[Reducethe load. If the system does not initiate an automatic load
retransfer,manually retransfer the critical load from the bypassline
tot he UPS.Reset the alarm.]
ModuleSummary
Alarm
SCC S
R( MMU)
An alarmmessage (see lists in SCC and Module Remote Monitor
Indicationsand Other Alarms That Activate Summary Alarmsin
3.1.5- System Configuration Screens) or the watchdog timer has
activatedthe Module Summary Alarm.
[Clearalarm conditions, if possible.]
ModuleN Off Line SCC D
R( MMU)
Theoutput circuit breaker of Module N is open. The number N will
identifythe module (1 through 6).
[Reviewactive alarms at Module N and clear alarm conditions, if
possible.]
Inverter
Nonsynchronized
MMU — Inverteroutput is not synchronized with the UPS system criticalbus.
Thisalso means the output circuit breaker is open and should not be
closeduntil the output is in sync. This condition may correct itself.If
not,shut down the UPS module and then perform a start-up
procedure.
[ContactLiebert Global Services if condition persists.]
Overload
Shutdown
MMU D, F, L, S TheUPS output current has exceeded175% of the rated full load or
theoverload capacity has been exceeded. The UPS module istaken
off-lineand shut down.
[ContactLiebert Global Services at once. Do not attempt to reset
circuitbreakers.]
ReversePower MMU D, F, L, S Excessivereverse power flow from the criticalbus into the UPS
inverterhas occurred, probably because of low inverterout put
voltageor a phase mismatch. The UPS module is taken off-line and
isshut down.
[ContactLiebert Global Services immediately. Do not attempt to
resetcircuit breakers.]
InverterFault MMU D,F, S Atleast one of the fuses has openedor an inverter fault was
detected.The UPS module is taken off-line and is shut down.
[ContactLiebert Global Services immediately. Do not attempt to
resetthe circuit breakers.]
Communication
Failure
SCC S The COM FAIL statusmessage is as important as an alarm
message.Refer to 3.1.13 - Alarm and Status Messages.
BatteryCycle
BufferWarning
— D, E TheoptionalBattery Cycle Monitor can retain information about the
last132 battery discharge events. When the storage buffer
approachesits capacity, this warning message is broadcast via
terminaland modem communication channels, and a complete
listingof all records is sent to the terminal port. The message clears
after30 seconds.
Table1 Alarm Messages - Meaning and Corrective Action (continued)
Alarm
Message
Cabinet
Location
Special
Functions
Meaning and
Corrective Action in Brackets [ ]
Table 1 Abbreviations
D= auto-dial; L= latches
E= reports only ; R= remote
F= freezes; S= summary
D*= auto-dial initiatedby Auto Transfert oBypass if load is on UPS whenalarm occurs
D#= auto-dial initiatedthrough Module N( 1-6)off-line
DISCONTINUED
PROD U C T