Alpha Technologies XM3-HP Series - Technical Manual - Manual (Page 90)

90 017-882-B0-001 Rev. C2 (10/2013)
3.0
Operation
3.8 Providing Power via Portable Generator or Inverter, continued
3.8.2 AC Powering, continued
4. After the generator is properly grounded, unplug the Power Supply from the convenience outlet
inside the enclosure and plug the Power Supply input cable into the generator output. Use an
outdoor rated approved extension cord. Recommend min 12 AWG for 120V, 14AWG for 240V
installations.
5. Start and operate the generator according to the generator operation manual.
6. If the generator kilowatt rating is twice the kilowatts used by the Power Supply indicated on the
Smart Display, leave the battery breaker on and the generator will charge the batteries. If the
generator fails, the Power Supply will continue to provide battery backup. If the generator output
is not approximately twice the kilowatt rating indicated on the Smart Display, switch the battery
breaker off to reduce the load on the generator if battery backup of the system is unavailable.
7. In either case, after the power from the generator is applied to the Power Supply, use the Smart
Display to increase the Frequency Input Tolerance to ±6Hz from the normal ±3Hz, inhibiting the
Power Supply from switching to battery backup if the generator occasionally does not operate
on the proper frequency. It is not uncommon for smaller (4 kilowatt or less) sized generators to
get “off frequency” due to the step loading of the Power Supply.
3.8.3 Using a Truck-mounted Inverter or Generator
To use a truck-mounted inverter or generator, follow the steps listed in Section 3.8.2, AC
Powering with the additional step of grounding the truck. Run the ground wire from an unpainted
point on the truck chassis to either a driven ground rod or strand ground to complete the
grounding circuit. The rubber tires on the truck insulate it from being grounded in all but the most
exceptional circumstances.
Ground the vehicle before operating a truck inverter or truck-mounted generator. Failure to do
so places service personnel at risk for electric shock.
WARNING!
3.0 Operation, continued