Emerson Liebert Static Transfer Switch - Manual (Page 135)

Event Message Help Text
127
S2 UV (RMS)
Source 2 Under Voltage (slow detection).
The input voltage from Source 2 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 S2 Fail alarm was
also issued and source transfer has been inhibited.
The load of the Liebert STS2 has been transferred to Source 1.
Press SILENCE on the touch screen 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 touch screen. 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.
S2 OV
Source 2 Over Voltage.
The input voltage from Source 2 exceeded a set percentage of the nominal voltage, as set in the OV Setting and OV
Detection Delay set points configured under the User Settings. An S2 Fail alarm was also issued and source transfer has
been inhibited.
The load of the Liebert STS2 has been transferred to Source 1.
Press SILENCE on the touch screen 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.
The alarm has triggered a message to be sent to the modem, 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.
S2 UF/OF
Source 2 Under Frequency/Over Frequency
The frequency for Source 2 is running outside the acceptable operating range, as set in the Frequency Trip Point under
User Settings. An S2 Fail alarm was also issued and source transfer has been inhibited.
Press SILENCE on the touch screen 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.
The alarm has triggered a message to be sent to the modem, 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.