Vertiv™ | Liebert
®
STS2
™
100-1000A, 50/60Hz User Manual | Rev. 12 | 11/2017 118
HEAT SINK OVERTEMP
Heat Sink Over Temperature.
The system heat sink temperature has exceeded the design limits.
Take immediate steps to cool the unit. Remove obstructions from the air inlet in the front of the unit. Remove and replace
the air filter behind the front door. A standard furnace filter can be used.
Press SILENCE on the touchscreen to turn Off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn Off the audible alarm.
This event was written to the Event Log, if so configured.
S1 UV
Source 1 Under Voltage (fast detection).
The input voltage from Source 1 dropped below a set percentage of the nominal voltage, as set in the Fast UV set point
under the User Settings. An S1 Fail alarm was also issued and source transfer has been inhibited.
The load of the Liebert STS2 has been transferred to Source 2.
Press SILENCE on the touchscreen to turn Off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn Off the audible alarm.
This event was written to the Event Log, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type
CA and
press RETURN on your keyboard.
S1 UV (RMS)
Source 1 Under Voltage (slow detection).
The input voltage from Source 1 remained below a set percentage of the nominal voltage for a designated period, as set in
the Slow UV Setting and Slow UV Detection Delay set points configured under the User Settings. An S1 Fail alarm was
also issued and source transfer has been inhibited.
The load of the Liebert STS2 has been transferred to Source 2.
Press SILENCE on the touchscreen to turn Off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn Off the audible alarm.
The alarm is latched and must be reset after the voltage returns to the nominal voltage. If the Reset option is not configured
for AUTO (automatic reset), then the reset action must be done manually. When the voltage is within acceptable
parameters, touch the RESET button on the touchscreen. If you are accessing the unit from a terminal, type
CA and press
RETURN on your keyboard.
This event was written to the Event Log, if so configured.
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