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