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Operation 63
3.11 Alarm Messages
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Table 8 Alarm Messages
Alarm
Message
Meaning and
Corrective Action in Brackets [ ]
AC INPUT
Input power out of tolerance Frequency or voltage of the input power is outside the acceptable range. The
battery supplies power to the critical load through the UPS Module.
DC BUS
Charger in reduced current mode Customer has selected reduced current operation of the charger from a contact
external to the UPS.
Battery charger problems The battery is not being charged. The voltage produced by the charger is
insufficient to maintain a charge on the battery.
[Contact Liebert Customer Service and Support.]
Low battery warning issued Battery has been discharging and the Low Battery Warning Time (factory set at
5 minutes, adjustable range 1 to 99 minutes) has been reached.
[Note time stamp on alarm message. Follow appropriate procedures to shut
down the critical load in an orderly sequence.]
Low battery shutdown Battery has discharged to the minimum allowable voltage and the UPS is shut
down. No power is being supplied to the critical load.
[When input power becomes available, perform a UPS start-up procedure.]
DC bus overvoltage DC bus voltage has exceeded the specified limit and the charger has been
turned off. The charger will automatically restart when the DC bus voltage
returns to within tolerance.
[Contact Liebert Customer Service and Support if this condition persists for
more than 2 minutes.]
BYPASS
Bypass frequency out of tolerance Input power frequency is outside of the specified tolerance (adjustable range .5
to 5 Hz). Automatic transfers to the Static Bypass Line are prohibited.
[Do not operate the Rotary Switch while this condition is present.]
Load transferred to bypass due to
overload
Critical load connected to the UPS has exceeded the UPS power rating. The
load has been automatically transferred to the Static Bypass Line. Power to the
load is not being conditioned by the UPS. An automatic retransfer will be
attempted when the load is reduced.
[Determine cause of the overload and reduce the load.]
Load transferred to bypass due to DC
overvoltage
DC bus voltage has exceeded the specified limit. The load has been
automatically transferred to the Static Bypass Line. An automatic retransfer will
be attempted when the DC bus voltage returns to within tolerance.
[Contact Liebert Customer Service and Support if this condition persists for
more than 2 minutes.]
Excessive retransfers attempted Several automatic retransfer attempts (15 attempts during 20 minutes or less)
have been made to retransfer the load from the Static Bypass Line back to the
UPS. The UPS has not been able to consistently sustain the load because of
an overload condition or an inverter failure. The load will remain on the Static
Bypass Line. Power to the load is not being conditioned by the UPS.
[Check other messages for inverter failure. Determine cause of the overload
and reduce the load.]
Static Switch failure A fault has been detected in the Static Transfer Switch. Automatic transfers to
the Static Bypass Line are prohibited.
[Contact Liebert Customer Service and Support.]