Voltage Regulator; Derating For Altitude; Wet Stacking; Receptacle Panel - Generac Power Systems MLG20ICAN Owner's Manual

Voltage Regulator

This unit is equipped with an electronic voltage regulator.
The voltage regulator controls the output of the generator
by regulating the current into the exciter field. The
regulator has three
potentiometers that may be adjusted for voltage, stability
and voltage roll-off (U/F). The voltage regulator is
adjusted before shipment from the factory. Contact
Generac Mobile Products 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 occurs when an engine is run at less than 30%
of its full load capacity, causing unburned fuel to
accumulate in the exhaust system. Wet stacking can be
detected by continuous black exhaust when the unit is
under a constant load. It can also cause fouling of
injectors and buildup on engine valves. Diesel engines
operate properly when applied loads are between 30%
and 100% capacity. Appropriate generator sizing is
determined by the anticipated load. If the unit is in a wet
stack condition, load the unit heavily for five hours or until
the exhaust is clear.

Receptacle Panel

This unit is equipped with a receptacle panel for running
accessories or tools from the generator. Power is
supplied to the receptacles any time the engine is
running and the main circuit breaker is switched to ON
(I). Each receptacle has an individual circuit breaker,
located inside the cabinet under a flip-up cover. Each
circuit breaker corresponds with the receptacle located
below it on the receptacle panel.
Should the main breaker, or any of the individual circuit
breakers trip, remove some of the load to the receptacles
before turning them back on.
NOTE: To ensure proper grounding, anytime the
generator is providing power to any equipment or load
panels that do not have a grounded plug, a ground wire
must be added between the equipment and the
grounding stud on the receptacle panel per the National
Electrical Code (NEC), state and local regulations.
Owner's Manual for Mobile Generator
screwdriver adjustable
Figure 3-5. Receptacle Panel Grounding Stud
A Receptacle Panel Grounding Stud

Shutting Down the Unit

Check with personnel using power supplied by the unit
and let them know the power is going to be turned off.
Verify the power shut down will not create any hazards by
accidentally turning off equipment that needs to be kept
on (pumps, compressors, lights, etc.). When you have
finished using the unit, proceed with shut down as
follows:
Remove all loads from the receptacles.
1.
Switch the individual circuit breakers for each
2.
receptacle to OFF (O).
Switch the main circuit breaker to OFF (O).
3.
Turn the key switch to OFF.
4.
NOTE: For extended storage time, disconnect the
battery. For extended storage requirements, see the
engine operator's manual.

Towing the Unit

Once the engine is shut down, follow these steps to
prepare the unit for towing.
Verify the unit is OFF.
1.
Use the jack to raise or lower the trailer onto the
2.
hitch of the towing vehicle. Lock the hitch coupling
and attach the safety chains or cables to the
vehicle. Raise the jack foot completely.
Connect any trailer wiring to the tow vehicle. Check
3.
for proper operation of the directional and brake
lights.
Verify all doors are properly latched.
4.
Check for proper inflation of the trailer tires. Proper
5.
inflation is specified on each tire.
Operation
A
003555
11