Operation 71
BYPASS (Contʼd.)
AutoTransfer to
Bypass
SCC D,E, F Thecritical load has been automatically transferred to the bypass
line.
[Usethe History Status screen to determine the cause for the
transfer.Clear all of the alarms before attempting to retransfer the
load from bypass to UPS.]
AutoRetransfer
Primed
SCC — Anautomatic retransfer will be initiatedwhen the OK to Transfer
conditionhas been present for 10 seconds, if the overload has
droppedbelow 100% of the rated SCC current and if enough UPS
modulesare on-line.
ManualReset/
Retransfer
SCC — Amanual retransfer is required.Ei thera system overload condition
haslasted more than 5 minutes, or no more auto-retransfer attempts
areavailable. Note that this alarm is only used if auto-retransfer
attemptsare enabled.
[Performa manual retransfer if all necessary conditionsare present.]
StaticSwitch
Unable
SCC S The UPS output is not synchronized to the bypass power source.
Thestatic bypass switch is disconnected, or it has failed internally.
[Emergencyand overload transfer to the bypass source is not
available.Manually set the Static Switch Disconnects to ON (closed)
if thestatic switch is disconnected. If the alarm conditions are
automaticallycorrected, reset the alarm to clear it. ContactLiebert
GlobalServices if the alarm stays on.]
BypassNot
Available
SCC — Thebypass power source voltage is not within specifications.
[Checkthe bypass power source.]
BypassPhase
SequenceWrong
SCC — Thepower conductors onthe bypass line are not wired to the UPS in
therequired sequence. This alarm should appear only during initial
start-upor after a repair to the source power system.
[Disconnectpower from the bypass line and correct the wiring.A
LiebertGlobal Services representative must be present duringi nitial
start-upof your UPS System.]
UPS SYSTEM
InputCurrent
Unbalanced
MMU E At least one inputphase differs from the average current by 10% or
morefor four (4) hours. Contact Liebert Global Services. If the
conditionpersists, transfer the load to the bypass line.
ControlPower
Fail
SCC
MMU
L,S
L,R, S
Thelogic control power supply from the UPS output is not operating
properly.The UPS module continues operating but will shut down if
theinput power fails. The SCC continues operating but will shut
downif the bypass power fails. Contact Liebert Global Services
immediately.
OutputOver/
UnderFrequency
SCC L,S Outputf requencydiffers from the nominal (60 Hz) by more than 0.5
Hz.No transfer or shutdown occurs.
[ContactLiebert Global Services at once.]
OutputUnder-
Voltage
SCC D,F, L, S TheUPS systemoutput voltage is under the minimum (-12%)
deviationfrom nominal. The load automatically transfers to the
bypassline.
[Ifthe alarm condition is no longer present, reset the alarm and
retransferthe load from bypass to UPS. Contact Liebert Global
Servicesif alarm persists.]
OutputOver-
Voltage
SCC D,F, L, S TheUPS system outputvoltage is above the maximum (+10%)
deviationfrom nominal. The load automatically transfers to the
bypassline. All UPS modules are taken off-line and are shut down.
[ContactLiebert Global Services at once. Do not attempt to reset
circuitbreakers.]
Table1 AlarmMessages - 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