Generac Power Systems MAGNUM MTT20IF4, Operating Manual

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
Ensure all covers are in place and secure.
 Ensure the emergency stop switch is pulled out.
ENGINE BREAK-IN REQUIREMENTS
Note: The EPA final tier 4 Isuzu engines have an engine break-in duration that will prohibit the unit from providing
rated standby power upon factory delivery. The unit is tested at the factory and is initially capable of a prime standby
power output. The engine performance will increase to 95% of full rated power during the first 20 hours of loaded
operation. The unit will provide full rated power after the complete engine break-in period of 70 hours of loaded
operation.
Operate the engine at heavy loads (60-90% [24-36kW] of rated output maximum) as much as possible during the
break-in period. If the engine has spent significant time at idle, constant speed(s) and/or light load or if makeup oil
is required, a longer break in period may be needed. Refer to the engine operator’s manual for a full description of
necessary procedures on the addition of oil and extension of the break-in period. For more information on regular
maintenance intervals, refer to
“Basic Maintenance Schedule - Isuzu Engine” on page 37 .
EMERGENCY STOP SWITCH
The unit is equipped with one emergency stop switch. For location of the emergency
stop switch, refer to
“Component Locations” on page 13 . The red switch is clearly
labeled “EMERGENCY STOP.” The switch can be accessed and activated with all
doors closed and locked.
Activate the emergency stop switch by pushing the red button in until it locks down.
This will open the fuel circuit, shutting down the engine. The switch will remain closed
until it is pulled out.
Use the emergency stop switch only when the unit must be shut down immediately. For any
other shut down, refer to “Shutting Down the Unit” on page 32 .
MANUAL STARTING OF THE UNIT
All units equipped with the L401 controller will initially start up in Stop mode. Use the following procedure to start the
generator in Manual mode:
1. Check that the main circuit breaker is in the OFF (O) position. Make sure the individual circuit breakers for each
of the lights are pushed in to the reset position.
2. Move the Control Power switch to the ON (I) position.
3. When the controller powers up, the Home screen will
be displayed and the controller will be in Stop mode
as indicated by the Stop LED being lit. Press the Start
button to initiate the startup procedure and start the
engine, provided there are no engine faults
preventing the unit from starting. The Start LED will
now become lit.
Note: The controller can be started from any screen. It
may take a few seconds for the engine to run smoothly
and reach its governed operating speed.
ST
OP
E
ME
RGENC
Y
00230
ON ON
NEUTRAL BONDED TO FRAME
DC
BREAKER
MAIN
BREAKER
240V
00898