LED STATE DESCRIPTION
Battery LED
On (Green) The battery is discharging
Flashing (Green) The battery has a pre-alarm of low voltage
On (Red) The DC-DC converter is faulty
Off The battery is charging, and the DC-DC converter is not functioning
Bypass LED
On (Green) The bypass is supplying power
On (Red) The bypass is abnormal and not available
Off The bypass is normal, but not supplying output power
Inverter LED
On (green) The inverter is supplying output power
Flashing (green) The inverter is starting up, in soft start or phase locked, and is not supplying output power
On (red) The inverter is faulty
Off The inverter is off
Output LED
On (green) The UPS output is supplying power
Flashing (green) The UPS internal manual bypass is supplying output power
On (red) The UPS has output overload
Off The UPS does not have output power
Fault LED
On (yellow) The UPS has an alarm or alarms
On (red) The UPS has one or more faults
Off UPS operating normally with no alarm or fault conditions
Table 5.1 LED descriptions (continued)
5.2 Audible Alarms
Three different audible alarms may occur during the UPS operation, described in Table 5.2 below.
ALARM SOUND MEANING
One beep per second When the UPS has an alarm, for example, AC fault (mains failure)
One beep every 0.5 second Upon UPS output overload or low battery voltage alarm during discharge
Continuous beep When the UPS has a fault
Table 5.2 Audible alarm descriptions
5.2.1 Control Buttons
The operation and display panel provides two control buttons described in Table 5.3 on the facing page.
Vertiv | Liebert® APS™ Installer/User Guide | 58
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