Alpha Technologies GMX-915 - Manual (Page 31)

31 017-932-B0-002, Rev. B
5.0 Operation, continued
5.1
Start-up and Test, continued
Standby Operation
1. Perform the following procedure after successful completion of a self-test with the GMX
Power Supply operating normally in AC line mode: Momentarily fail the AC utility input
power by switching the AC circuit breaker (service disconnect) to OFF.
2. The GMX Power Supply should start operating in the inverter mode. Use the Smart
Display or a true RMS voltmeter to verify output at the V
out
± terminals. Output voltages
should appear within ±5% of 87Vac (for 90V units) and 63Vac (for 60V units), at nominal
line input voltage.
3. Return the GMX Power Supply to AC Line mode by switching the AC (service disconnect)
circuit breaker to ON. The transfer back to utility power may take 10 to 20 seconds. This
delay allows the utility voltage and frequency to stabilize before the module’s phase-lock
circuitry is activated. The module then synchronizes the inverter’s waveform to the utility’s
before initiating a smooth, in-phase transfer back to utility power. Once the transfer is
complete, the smart display will report: OPER MODE = LINE.
. The GMX Power Supply is now fully operational.
SETTING LOW (-5%) HIGH (+5%)
87Vac 82.65Vac 91.35Vac
63Vac 59.85Vac 66.15Vac