Alpha Technologies XM2, XM2-HV, XM2-HP - Manual (Page 55)

4.1 Start-up and Test, continued
4.1.3 Standby Operation
Perform the following procedure after successful completion of a self test with the
CableUPS operating normally in AC line mode.
1. Momentarily fail the AC utility input power by switching the AC (service
disconnect) circuit breaker to OFF.
2. The power supply starts operating in the inverter mode. Use the Smart Display or
a true RMS voltmeter to verify output. Output voltages should appear within ±5%
of: 89Vac for HV models, 87Vac for 90V units, 75Vac for 75V units and 63Vac
for 60V units, at nominal line input voltage. In the case of an XM2-615A that has
been set for 48Vac output, the measured output voltage should be ±5% of 48Vac.
See Table 4-1.
3. Return the 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 50 seconds for the utility voltage and frequency to stabilize, and the module’s
phase-lock circuitry to activate. The module then synchronizes the inverter’s
waveforms before initiating a smooth, in-phase transfer back to utility power.
Once the transfer is complete, the Smart Display reports: OPER MODE = LINE.
The CableUPS is now fully operational.
55 017-805-B0-010 Rev. K2