Led Indicators; Audible Alarm (Buzzer); Control Keys - Liebert APM 150 User Manual

28 Chapter 4 Operator Control And Display Panel

4.1.1 LED Indicators

The LED indicators mounted on the mimic power flow chart represent the various power paths and current
UPS operational status. The indicators are described in Table 4-2.
Indicator
Rectifier indicator
Battery indicator
Bypass indicator
Inverter indicator
Load indicator
Status indicator

4.1.2 Audible Alarm (Buzzer)

UPS activity is accompanied by the two kinds of sound listed in Table 4-3.
Beep every other second
Continuous beep

4.1.3 Control Keys

The operator control and display panel provides five control keys, as described in Table 4-4.
Control key
EPO switch
Inverter start switch
Inverter shutdown switch
Fault reset switch
Audible alarm silencing
switch
Liebert APM 150 Integrated UPS Single Module And Parallel System
Table 4-2 Indicator description
State
Solid green Rectifiers in normal operation
Flashing green Mains input normal, but rectifiers not operating
Solid red Rectifiers failed
Off Rectifiers not operating, mains input abnormal
Solid green Load on battery
Flashing green Battery EOD pre-warning
Battery abnormal (failed, absent or polarity reversed) or battery converter
Solid red
abnormal (failed, overcurrent or overtemperature)
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
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
Off Inverters not operating
Solid green UPS output on and normal
Solid red UPS output on and overloaded
Off UP output off
Solid green Normal operation
Solid yellow Alarm (for example, AC input failure)
Solid red Fault (for example, fuse or hardware fault)
Table 4-3 Audible alarm description
Alarm sound
Table 4-4 Description of control keys
Silkscreen
Cut off the load power, shut down the rectifier, inverter, static bypass
EPO
and battery
INVERTER ON Start the inverter
INVERTER OFF Shut down the inverter
FAULT CLEAR Restart the UPS (subject to any fault being cleared)
SILENCE When an alarm is active, pressing this button silences the audible alarm.
ON/OFF Pressing this button again enables the buzzer again
Description
Meaning
UPS alarm, for example, AC input failure
UPS fault, for example, fuse or hardware fault
Description
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