Alpha Technologies XM3-HP Series - Technical Manual - Manual (Page 18)

18 017-882-B0-001 Rev. C2 (10/2013)
1.0
Introduction
1.2 Theory of Operation, continued
1.2.2 Standby Operation, continued
• When set to Individual Battery Voltage Mode, if individual battery voltage is lost, the unit automatically
reverts back to Battery String Voltage Mode and "Low Battery Cutoff” (EOD) will revert back to default
value based on battery type.
HP Batteries GXL Batteries OTHER Batteries
Fixed Fixed Fixed
String Low Battery
Cutoff (EOD)
30.6 VDC
(1.70 V/C)
31.5 VDC
(1.75 V/C)
31.5 VDC
(1.75 V/C)
Individual Low
Battery Cutoff
(EOD)
Default Minimum Maximum
HP Batteries
10.2 VDC
(1.70 V/C)
9.9 VDC
(1.65 V/C)
10.8 VDC
(1.80 V/C) GXL Batteries
10.5 VDC
(1.75 V/C)
OTHER Batteries
10.5 VDC
(1.75 V/C)
• When acceptable AC line voltage returns, the Power Supply returns to AC line operation after a 10
to 20 second lag. This delay lets the AC line voltage and frequency stabilize before the control logic
phase-locks the inverter’s output to the utility input. The control logic then de-energizes the isolation
relay, reconnects the AC line to the primary of the ferroresonant transformer and disables (turns off)
the inverter. This results in a smooth, in-phase transfer back to utility power without interruption of
service to the load. The battery charging circuit then activates to recharge the batteries in preparation
for the next power outage.
1.2.3 Charger Modes of Operation
AlphaCell Batteries OTHER Batteries
HP GXL Default Minimum Maximum
Float V/C 2.25 2.27 2.27 2.10 2.35
Accept V/C 2.35 2.40 2.40 2.20 2.45
Automatic 30-Minute
Refresh On/Off
ON ON OFF OFF OFF
Manual 24-Hour
Refresh On/Off
OFF
(Programmable)
OFF
(Programmable)
OFF
(Programmable)
OFF ON
Refresh V/C 2.45 2.45 2.45 2.40 2.50
Rest On/Off ON OFF
OFF
(Programmable)
OFF ON
Temperature
Compensation
-4mV / ºC / cell -5mV / ºC / cell
-5mV / ºC / cell
(Programmable)
0 mV / ºC / cell -5mV / ºC / cell
1.0 Introduction, continued
Table 1-1, Low Battery Cutoff (EOD)
Table 1-2, Charger Modes of Operation
If a battery type other than an AlphaCell is installed, it is the responsibility of the technician to review the proper
charging specifications for the battery used.
NOTE: