017-230-B4 Rev B
40
Figure 24 — UPS Maintenance: Inverter screen
UPS Maintenance > Inverter
Inverter Enabled/Disabled
Enabled: the inverter can function depending on the setting of the Inverter On/Off field.
Disabled: the FXM will not go into Inverter mode when it loses AC power.
Inverter On/Off
Selecting inverter On/Off will not turn on the inverter unless inverter is enabled first.
Inverter Off Delay Time
Used to set a delay before the inverter switches off to allow time for switching off critical loads. The set In-
verter ON/OFF delay is only available when the Alpha FXM is in the Battery or Standby modes.
The delay can be adjusted in 1 second steps with a default setting of 0 seconds to a maximum of 600 sec-
onds (10 minutes). The delay is only available in the Standby or Inverter modes. Once the Alpha FXM returns
to the Line mode, the delay resets to 0 seconds.
Inverter Cutoff Enable/Disable
Enabled: the user configured inverter cutoff threshold is used.
Disabled: the default FXM inverter cutoff threshold is used.
Inverter Cutoff Threshold
Defines the point where the unit will switch from Inverter to Standby when the battery is considered to be low
or in order to preserve the battery.
The inverter cutoff threshold is configurable in 0.1Vdc increments according to the battery voltage as de-
scribed in the following table.
24Vdc Battery
48Vdc Battery
Parameter
Default
Minimum Maximum
Default
Minimum Maximum
Inverter Cutoff (Vdc)
21.5
21.5
23
42
42
46
Battery Low Warning Threshold (Vdc)
Vset + 1
Vset + 2
