Operational Testing - Generac Power Systems 50 Hertz Air-cooled Generators Installation Manuallines

Appendix A
5. Being careful to support the lugs, torque the lugs in the
transfer switch to the specifications shown on the transfer
switch. Decal located on the inside of the switch door.

OPERATIONAL TESTING

1. Switch the main utility breaker OFF. Refer to NFPA 70-E for the
safety equipment required when working inside a live transfer
switch.
2. Energize the utility and check line-to-line and line-to-neutral
(if applicable) voltage at terminals N1 and N2 on the transfer
contactor. If line-to-line voltage is not approximately 220 volts,
de-energize utility power and check the terminations between
the utility and N1 and N2.
If applicable, if line-to-neutral voltage is not approximately
110 volts, de-energize utility power and check the neutral
terminations.
Repeat the same voltage checks on terminals T1 and T2 to
make sure current is flowing properly through the contactor.
12
3. Switch the generator's main circuit breaker OFF and put the
mode switch in the OFF position.
4. Make sure utility power is OFF and place all of the individual
circuit breakers in the main distribution panel in the OFF position.
5. Locate the transfer handle, insert the metal end into the slot in
the main contactor assembly. Pull the handle DOWN to move
the main contacts to the standby power (generator) position.
NEVER OPERATE THE TRANSFER SWITCH MANUALLY WHEN
LOADS ARE CONNECTED.
6. Put the generator's mode switch in MANUAL to start the engine.
Allow the engine to warm up, then switch the generator's main
breaker to the ON position. The generator is now supplying
electricity to the transfer switch but is not carrying any load.
7. Check to be sure that voltage and frequency from the
generator is correct. If line-to-line voltage is not approximately
220 volts, refer to the generator Owner's Manual for the proper
adjustment procedures. If line-to-neutral (if applicable) voltage
is not approximately 110 volts, check the neutral connection
between the generator and transfer switch.