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Operation
8. Check that the frequency (Hz) is correct on the Generator screen. With no loads connected to the generator,
the frequency should read approximately 60 Hz, depending on the type of engine governing used.
9. If all wiring connections have been made correctly, switch the main circuit breaker to the ON (I) position and
then add any loads attached to the receptacles by switching the respective circuit breaker to the ON (I) posi-
tion. You will notice a slight change in engine sound when a load is applied to the unit.
10. Once the engine is running, allow it to reach normal operating temperature before switching on any loads.
AUTO (REMOTE) STARTING OF THE UNIT
Auto mode is used when the unit is started from a location other than the control panel by using a transfer switch.
Auto (remote start) is the normal setting when the generator is being used as a standby power supply. Before putting
the unit in the Auto mode, review the
and information on isolating the generator with a transfer switch if the unit is to be used as a standby power supply.
Then continue with the steps described below:
1. Perform a manual start of the unit at least once to verify that the engine is operating correctly.
Note: The lights are automatically disconnected on startup. The main circuit breaker can be left on if no other loads
are connected, except for the lights. Any connected external loads must be disconnected by a transfer switch when
starting the unit.
2. If a check of the remove start circuit is desired:
a. Remove the wires from the remote start terminal block. Press the Select () button to select "AUTO." The
Select LED with be lit.
b. Attach a jumper wire (minimum 16 gauge) across the two terminals on the remote start terminal block. This
applies a ground to the Power Zone™ Light controller to close the starting circuit contacts. The engine
should crank, start and run.
c. Remove the jumper wire form the remote start terminal block and the engine will stop.
d. Reconnect any necessary wires form the remote start switch (transfer switch) to the remote start terminal
block.
3. Confirm the unit is in Auto mode. The Select LED should be lit.
4. Secure the unit by closing and locking all access doors.
5. The unit is now ready for remote starting.
VOLTAGE REGULATOR
The electronic voltage regulator controls the output of the generator by regulating the current into the exciter field.
The regulator has three screwdriver adjustable potentiometers that may be adjusted for voltage, stability and voltage
roll-off (U/F). The voltage regulator on your unit is adjusted before shipment from the factory. Contact Generac Mobile
Products LLC for additional information before attempting to adjust the voltage regulator.
DERATING FOR ALTITUDE
All units are subject to derating for altitude and temperature; this will reduce the available power for operating tools
and accessories connected to the receptacles. Typical reductions in performance are 2-4% for every 1000 ft (305
m) of elevation and 1% per 10ºF (5.6ºC) increase in ambient air temperature over 72ºF (22ºC).
WET STACKING
The unit is powered by a diesel engine. Diesel engines are susceptible to wet stacking if lightly loaded. Wet stacking
18
"Prestart Checklist"
and
"Manually Starting the
MDG20IF4-MLG20IF4 Operating Manual
Unit". Also following any warnings
37100 B
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