Chapter 4 Operator Control And Display Panel 27
Liebert APM 90 Integrated Modular UPS User Manual
Table 4-2 Indicator description
Indicator State Description
Solid green Rectifiers in normal operation
Flashing green Mains input normal, but rectifiers not operating
Solid red Rectifiers failed
Rectifier indicator
Off Rectifiers not operating, mains input abnormal
Solid green Load on battery
Flashing green Battery EOD pre-warning
Solid red
Battery abnormal (failed, absent or polarity reversed) or battery
converter abnormal (failed, overcurrent or overtemperature)
Battery indicator
Off Battery and battery converter normal, battery charging
Solid green Load on bypass
Solid red
Bypass power abnormal or outside specifications, or static bypass switch
fault
Bypass indicator
Off Bypass normal
Solid green Load on inverters
Flashing green
Inverters turning on, starting up, synchronizing, or standing by (ECO
mode)
Solid red Inverter fault
Inverter indicator
Off Inverters not operating
Solid green UPS output on and normal
Solid red UPS output on and overloaded
Load indicator
Off UP output off
Solid green Normal operation
Solid yellow Alarm (for example, AC input failure)
Status indicator
Solid red Fault (for example, fuse or hardware fault)
4.1.2 Audible Alarm (Buzzer)
UPS activity is accompanied by the two kinds of sound listed in Table 4-3.
Table 4-3 Audible alarm description
Alarm sound Meaning
Beep every other second UPS alarm, for example, AC input failure
Continuous beep UPS fault, for example, fuse or hardware fault
4.1.3 Control Keys
The operator control and display panel provides five control keys, as described in Table 4-4.
Table 4-4 Description of control keys
Control key Silkscreen Description
EPO switch EPO
Cut off the load power, shut down the rectifier, inverter, static bypass
and battery
Inverter start switch INVERTER ON Start the inverter
Inverter shutdown
switch
INVERTER OFF Shut down the inverter
Fault reset switch FAULT CLEAR Restart the UPS (subject to any fault being cleared)
Audible alarm
silencing switch
SILENCE ON/OFF
When an alarm is active, pressing this button silences the audible alarm.
Pressing this button again enables the buzzer again
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