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Operation
30 MMG130DI4/175DI4/205DI4 Operating Manual 33722 D
VOLTAGE REGULATOR
The electronic voltage regulator controls the output of the generator by regulating the current into the exciter field.
The regulator has four screwdriver adjustable potentiometers that may be adjusted for U/F dip, under frequency
protection (U/F), stability, and voltage. The voltage regulator on the unit is adjusted before shipment from the factory.
Contact Generac Mobile Products LLC for additional information before attempting to adjust the voltage regulator.
Note: For units equipped with a Marathon DVR2000E+ digital voltage regulator, please refer to the Marathon operating
manual provided with the unit.
CUSTOMER CONVENIENCE RECEPTACLES
The unit is equipped with five receptacles. The large
receptacles are 240/120VAC twist-lock receptacles
rated at 50A each. The smaller duplex receptacles
are 120VAC rated at 20A each with ground fault circuit
interrupt (GFCI) protection. These receptacles are not
routed through the main circuit breaker. Each recep-
tacle has its own circuit breaker, located directly above
or next to the receptacle. Each breaker is sized to the
maximum rating of the corresponding receptacle.
Power to the receptacles is
available any time the generator
is running, EVEN IF THE MAIN
CIRCUIT BREAKER IS OFF (O)
VERIFY ANY EQUIPMENT
CONNECTED TO THE
RECEPTACLES IS TURNED
OFF BEFORE TURNING THE
BREAKERS ON. Verify the
voltage selector switch is in the
proper position and that the
output voltage is correct for the
equipment that is connected to
the receptacles. Improper voltage
may cause equipment damage or
malfunction.
Note: When the voltage selector switch is in position for 480/277V 3Ø, voltage at the two GFCI receptacles is 139
volts and the voltage at the three twist-lock receptacles is 240/139 volts. Generac Mobile Products LLC does not
recommend using the receptacles in the 480V position. When the voltage selector switch is in position for 208/120V
3Ø, voltage at the three twist-lock receptacles and the two GFCI receptacles is 208/120 volts.
50A Circuit
Breakers
20A Circuit
Breakers
120V GFCI
Receptacles
120/240V
Twist-Lock
Receptacles
02110
Figure 3-8. Receptacle and
Breaker Locations
36


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