Product Manual

Owner’s Manual for Mobile Generator 27
Operation
Figure 3-3. Three or More Units in Parallel
Manual Parallel
1. Verify the units to be paralleled are OFF.
2. Secure all electrical connections to each unit and a
common bus. Verify all wiring is properly color
coded or labeled prior to connection. Any crossed
connections will prevent units from paralleling.
3. Connect MSC cable(s) and terminating plugs
(resistors) to the end units.
4. Turn the battery disconnect ON.
5. Turn on the controller power for each unit.
6. Put the controller in MANUAL mode (lower left
button).
7. Start each unit to be paralleled and allow them to
warm up.
8. Press the Close Circuit Breaker button on each
unit.
Automatic Parallel
1. Verify the units to be paralleled are OFF.
2. Secure all electrical connections to each unit and a
common bus. Verify all wiring is properly color
coded or labeled prior to connection. Any crossed
connections will prevent units from paralleling.
3. Connect MSC cable(s) and terminating plugs
(resistors) to the end units.
4. Turn the battery disconnect ON.
5. Connect two wire start signal (dry contact closure)
to all the generators on the MSC network. The
contact closure will be in parallel.
6. Turn ON the controller power for each unit.
7. Put the controller in AUTO mode.
Shutting Down the Units in MANUAL Mode
1. Press the Open Circuit Breaker button on each unit
to be shut down. Note the controller will ramp off
the load before opening the circuit breaker.
2. Allow the engine to cool if previously under heavy
load.
3. Press the Engine Stop button.
4. Turn OFF controller power.
5. Turn battery disconnect OFF.
NOTE: If any units are in parallel, do not disconnect the
MSC cable.
Low Idle Switch
Engine idle speed is 1,000 to 1,200 rpm. The engine will
start at idle speed and run at idle for 15 seconds no
matter what position the idle switch is in. After 15
seconds of running at idle, the unit will ramp up to 1,800
rpm if the idle switch is OFF. Otherwise the unit will
continue to idle if the idle switch is ON.
When the engine is at idle speed (1,000 rpm), the voltage
regulator will not function and the output voltage is
dropped out by the voltage regulator.
IMPORTANT NOTE: Do not apply load to the unit
when the engine is running at idle speed.
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.
Cold Weather Operation
The engine may be equipped with a coolant heater, oil
pan heater, crankcase ventilation heater, battery heater
or fuel heater as cold weather starting aids.
See Figure 3-4. Starting aids are required below
32°F (0°C). They will enhance starting performance
below these temperatures and may be needed to start
applications that have high parasitic loads during
cranking and start acceleration to idle. Other cold
weather starting aids are required at temperatures below
-13°F (-25°C) or at altitudes above 5,000 ft (1,500 m).
The use of correct grade oil (see Recommended Oil
Types) is critical to achieving adequate cold weather
cranking speed. Synthetic oils have improved flow at low
temperatures.
The oil pan heater, battery heater and fuel filter heater (if
equipped) are activated with a thermostat and will turn on
and off as needed. The coolant heater is powered by a
shore power 120V electrical connection. The crankcase
ventilation heater is powered by the generator and will
stay on when the engine is operating in cold weather
conditions.
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