Alpha Technologies AlphaGen PN-6x-T 7.5kW 48VDC - Technical Manual - Manual (Page 74)

74 042-288-B0-001, Rev. A
Fig. 6-2, Wiring for ECM, Ignition Battery Charger, and Ignition Battery
6.0 Operation, continued
6.2 Alpha Ignition Battery Charger Overview
The Alpha Ignition Battery Charger (Alpha P/N 744-870-21)) keeps the ignition battery
charged to start the Auxiliary Power Unit (APU) in the event of an extended power outage.
The charger is active when the yellow LED on the face of the unit is lit. When the generator
starts, the Alpha Ignition Battery Charger (IBC) shuts off and internal engine charger takes
over ignition battery charging.
48V Systems
The ECM monitors ignition battery voltage via the generator control board. The following
conditions must be met for the ECM to turn on the ignition battery charger:
• DC bus greater than 49Vdc
• Ambient temperature less than 35°C and battery voltage less than 13.2Vdc, or battery
voltage less than 12.6V at any temperature
The following conditions turn the ignition battery charger off:
• Engine off and DC bus less than 48Vdc
• Ambient temperature greater than 40°C and battery volts greater than 13.2
• Battery volts greater than 14.5
Fig. 6-1, Ignition Battery Charger LED
LED ON Indicates Charger is
Active
Engine
Control
Module
Charger
Control
Ignition
Battery
Charger
Ignition Battery
DC BUS
Charger
Power
PCB Mounted
Temp Sensor