Alpha Technologies AlphaGen PN-6x-T 7.5kW 48VDC - Technical Manual - Manual (Page 72)

72 042-288-B0-001, Rev. A
5.0 Turn-up and Test, continued
5.4 Generator System Sensor Verifi cation, continued
5.4.2 AC and DC Line Sense Verifi cation
The ECM monitors the AC line and DC bus status to determine when to start and
stop the APU. In the event of an extended power outage or low battery bus voltage
the ECM will start the APU. The following test verifi es these functions.
1. Verify the ECM RAS switch is in the AUTO position, the APU is not running, and
there are no major or minor alarms reported other than the Tamper alarm.
2. Place the Output Circuit Breaker in the OFF position.
3. ECM reports a minor DC Bus Fault alarm.
4. Verify the APU starts and alarm clears. Return the Output Circuit Breaker to the
ON position.
5. After the ECM verifi es 53Vdc (or greater) the generator will run for a12-minute
cooldown period and shut down
6. Remove the AC Utility Line sense cable from the front of the ECM.
7. Verify the ECM reports a Line Failure notifi cation and the APU starts running after
a three minute time delay.
8. Replace the AC Utility Line sense cable and verify the notifi cation clears.
9. Verify the APU stops running after the 12-minute cooldown period