Audible Alarm (Buzzer); Control Keys - Emerson Liebert APM 90 User Manual

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
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
Solid red
converter abnormal (failed, overcurrent or overtemperature)
Off Battery and battery converter normal, battery charging
Solid green Load on bypass
Bypass power abnormal or outside specifications, or static bypass switch
Solid red
fault
Off Bypass normal
Solid green Load on inverters
Inverters turning on, starting up, synchronizing, or standing by (ECO
Flashing green
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)
When an alarm is active, pressing this button silences the audible alarm.
SILENCE ON/OFF
Pressing this button again enables the buzzer again
Liebert APM 90 Integrated Modular UPS User Manual
Chapter 4 Operator Control And Display Panel
Description
Meaning
UPS alarm, for example, AC input failure
UPS fault, for example, fuse or hardware fault
Description
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