Alpha Technologies GMX-915 - Manual (Page 48)

8 017-932-B0-002, Rev. B
5. 0 Operation, continued
5.5 Providing Power via External Source, continued
5.5.2 AC Powering, continued
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 (this reduces the load on the generator but 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. This limits 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.
5.5.3 Using a Truck-mounted Inverter or Generator
To use a truck-mounted inverter or generator follow the steps listed in Section
5.5.2 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 the truck inverter or truck-mounted generator. Failure
to do so will place service personnel at risk for electric shock.
WARNING!