Alpha Technologies AlphaGen PN-6x-T 7.5kW 48VDC - Installation and Operation Manual - Manual (Page 57)

745-020-B0-003, Rev. C 57
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 will verify 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. Verify the APU starts and the ECM reports a minor DC Bus Fault alarm.
4. Verify the alarm clears, and return the Output Circuit Breaker to the ON position.
5. Verify the RAS switch is in the AUTO position, and the APU has run for one
minute.
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 continues to run for a 12 minute “cool down” period.