Fine Voltage Adjustment; Voltage Regulator; Customer Convenience Receptacles; Main Circuit Breaker - Generac Mobile MMG35DF4 Owner's Manual

Operation
4. Replace and lock padlock on voltage selector
switch lockout device.
5. Start the unit according to
Unit or AUTO (Remote) Starting the

Fine Voltage Adjustment

The fine voltage adjustment is done through the
potentiometer (pot). The pot allows for ±10% voltage.

Voltage Regulator

The automatic voltage regulator controls the output of the
generator by regulating the current into the exciter field.
The voltage regulator is adjusted before shipment from
the factory. The regulator has four screwdriver adjustable
potentiometers that may be adjusted for under frequency
roll-off (U/F), U/F dip (DIP), stability (STAB), and voltage
(VOLT). Contact a GMASD for additional information
before attempting to adjust the voltage regulator.
NOTE: For units equipped with a Marathon DVR2000E+
automatic voltage regulator, see the Marathon operating
manual provided with the unit.
Customer Convenience
Receptacles
CAUTION
Equipment Damage. Verify voltage application
before making changes to factory settings. Incorrect
voltage applied to a load could result in equipment
damage.
See Figure 2-4. The unit is equipped with four
receptacles. The 240/120V twist-lock receptacles are
rated at 50A each. The 120V GFCI receptacles are rated
at 20A each, with ground fault circuit interrupt (GFCI)
protection. The receptacles are not routed through the
main circuit breaker. Each receptacle 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.
NOTE: Power to the receptacles is available any time
the generator is running, even if the main circuit breaker
is OFF (O). Verify equipment connected to the
receptacles is turned OFF before turning the breakers
ON (I).
NOTE: When the voltage selector switch is in position for
480/277V three-phase, voltage at the two GFCI
receptacles is 139 volts and the voltage at the three twist-
lock receptacles is 240/139 volts. Generac Mobile does
not recommend using the receptacles in the 480V
position. When the voltage selector switch is in position
for 208/120V three-phase, voltage at the two twist-lock
30
Manually Starting the
Unit.
(000303)
receptacles and the two GFCI receptacles is 208/120
volts.

Main Circuit Breaker

The main circuit breaker is located on the main control
panel. See Figure 2-4. When the breaker is OFF (O),
power is interrupted to the connection lugs, the optional
cam lock receptacles, and the generator. The breaker
may be switched ON (I) once the connections have been
made to the connection lugs or the optional cam lock
receptacles, and the unit has been started and allowed to
reach normal operating temperature.
NOTE: Main circuit breaker cannot be turned on until
controller reads GENERATOR AVAILABLE.
Reasons the main circuit breaker may trip:
Overload of the generator circuits to the connection
•
lugs or the optional cam lock receptacles.
The door covering the connection lugs or the
•
optional cam lock receptacles is opened.
If the emergency stop switch is activated.
•
Verify any problems that cause the main circuit breaker
to trip are corrected before returning the switch to ON (I).
NOTE: The main circuit breaker only interrupts power to
the connection lugs and the optional cam lock
receptacles. The customer convenience receptacles
have power even if the main circuit breaker is OFF (O).
Use the individual circuit breakers located near each
receptacle to disconnect power to these receptacles.
DOC and SCR Cleaning
Operations
WARNING
Risk of Burn. Stay clear of the exhaust system
during operation and exhaust filter cleaning.
Exposure to hot exhaust gases and components
could result in serious injury.
When enabled, the exhaust after-treatment system goes
through an automatic cleaning process known as
regeneration. Under normal circumstances, regeneration
occurs without interrupting unit operation and with
minimal operator involvement. In the event there are
conditions requiring the operation of the unit with the auto
exhaust after-treatment cleaning disabled, the operator
may be required to perform procedures to enable or
disable the auto exhaust after-treatment cleaning. The
operator may also be required to perform a manual
regeneration.
NOTE: Always park the unit in a safe location for
elevated exhaust temperatures and check for adequate
fuel level before beginning the exhaust after-treatment
cleaning process. The cleaning cycle can take an
Owner's Manual for Mobile Generator
(000304)