Operation 73
UPS SYSTEM (Contʼd.)
Hardware
Shutdown
MMU D# Atl eastone of the following alarm conditions is present: Inverter
Fault,Rectifier Fuse Blown, Reverse Power, Overload Shutdown,
logicpower supply failure, or inverter output symmetry failure. The
UPS moduleis taken off-line and is shut down.
[ContactLiebert Global Services at once. Do not attemptto reset the
circuitbreakers.]
EmergencyOff SCC
MMU
D*,L, S TheEm ergencyModule Off (or Emergency Power Off) switch has
beenpressed, which caused the UPS system to shut down and
transferthe load to the bypass line (or all power to the critical load
hasbeen shutdown).
[Determinethe cause of the emergency condition and correct it if
possible.Contact Liebert Global Services if you requireassistance.]
COOLING
AmbientOver-
Temperature
MMU R,S Theintake air to the UPS module exceeds the specified maximum
temperature.
[Thiscondition only causes an alarm, but should be corrected
immediatelyto prevent damage to equipment due to overheating.]
BlowerFailed MMU S A fault in one or more of the blower motors has occurred. This
conditiononly causes an alarm, but if not promptly corrected it could
causean equipment over-temperature condition that would shut
downthe UPS module.
[Checkthe blowers for proper operation. Contact Liebert Global
Servicesif you require assistance.]
EquipmentOver-
Temperature
MMU S Sensors on power semiconductor heatsinks detecttemperatures
abovethe steady state limits for these components.The control logic
setsoff the alarm but does not shut down the UPS module if the
conditionlasts less than 10 minutes.
[Checkthe air intake, air exhaust, and filters. Reduce the load or
transferit to bypass. Contact Liebert Global Services ift healarm
persists.]
Over-Temperature
Timeout
MMU D, F AnEquipmentOver-Temperature condition has persisted for more
than10 minutes. The UPS module is taken off-line and is shut down.
[Checkthe air intake, air exhaust, and filters before attempting to
start-up the UPS.]
REMOTE MONITOR PANELS
(Referalso to SCC and Module Remote Monitor Indications and Other Alarms That Activate SummaryAlarms in
3.1.5- System Configuration Screens)
LoadOn UPS — R(SCC) TheUPS isoperating properly. No corrective action is necessary.
NewAlarm — R(SCC)
R( MMU)
Anothernew alarm message has been registered on the UPS
system.
[Clearthe new alarm condition, if possible.]
SystemSummary
Alarm
— R(SCC) Oneor more of the UPS system alarm messages has beenactivated
ora control logic failure has been detected by a watchdog timer.
[Usethe Present Status screen to determine which alarms are
active.Clear the new alarm condition if possible to do so.]
ModuleSummary
Alarm
— R(MMU) One or more of the UPS module alarm messageshas been
activated.
[Usethe Present Status screen to determine which alarms are
active.Clear the new alarm condition, if possible to do so.]
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