Generac Power Systems CorePower Repair Manual page 21

GENERAL INFORMATION
Exercise
• Exercise will not function if the generator is already running
in either AUTO or MANUAL mode.
• During exercise, the controller will only transfer if Utility fails
during exercise for 10 seconds, and will follow the steps
outline above for AUTO operation.
Utility Restored
The generator is running, switch is in the "Standby" position,
running in Utility failure. When the Utility returns (above 75%
of nominal), a 15 second return to Utility timer will start. At
the completion of this timer, if the Utility supply is still present
and acceptable, the controller will transfer the load back to
the Utility and run the engine through a one minute cool down
period and then shutdown. If Utility fails for three seconds
during this cool down period, the controller will transfer load
back to the generator and continue to run while monitoring for
Utility to return.
PART 1
Section 1.5
Automatic Operating Parameters
Page 19