Generac Power Systems MAGNUM MTT20IF4, Operating Manual

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To exit the active DTC(s) alarm section, press the ↑ and ↓ buttons simultaneously to enter the navigation menu. Once
entered, cycle to the desired operator screen.
EVENT LOG
The controller’s event log displays a list of the last 15 record electrical trip or shutdown events and the engine hours
at which they occurred. Once the log is full, any subsequent electrical trip or shutdown alarms overwrites the oldest
entry in the log. Hence, the log always contains the most recent shutdown alarms.
To view the event log, press both ↑ and ↓ buttons simultaneously, the navigation menu is then displayed. Once
entered, cycle to the event log section and press the Auto button to enter. Repeatedly press the ↑ or ↓ buttons until
the LCD window displays the desired event.
Continue to press down the ↑ or ↓ buttons to cycle through the past alarms, after which they display shows the most
recent alarm and the cycle begins again.
To exit the event log, press the ↑ and ↓ buttons simultaneously to enter the navigation menu. Once entered, cycle
to the desired operator screen.
PRESTART CHECKLIST
Before starting the unit, all items in the prestart checklist must be completed.

Read and understand ALL safety sections at the beginning of this manual.
 Ensure all maintenance procedures are up to date. For more information, refer to “General
Maintenance” on page 37 and “Basic Maintenance Schedule - Isuzu Engine” on page 37 .
 The unit must be level.

The unit must be dry. Check for any water inside, on, or near the unit; dry if needed.
 Ensure the unit is properly grounded to a good earthen ground. Installation should be in compliance
with the National Electrical Code (NEC), state and local regulations.
 Switch the Control Power switch to the OFF (O) position.

Switch all circuit breakers to the OFF (O) position.
 Inspect all electrical cords; repair or replace any that are cut, worn, or bare.

Ensure all winch cables are in good condition and centered on each pulley. Do not use if cables are
kinked or beginning to unravel.

Check oil, coolant, and fuel levels. For more information, refer to “General Maintenance” on page 37 .
 Ensure engine battery connections are secure.

Turn the battery disconnect switch on, if equipped.
 Check the engine fan belt tension and condition.

Check the engine fan belt guard.
 Check the engine exhaust system for loose or rusted components.
Icon Fault DTC Description
Check Engine Fault
The engine ECU has detected a fault not recognized by the con-
troller, contact the engine manufacturer for support.
Low Oil Pressure
The engine ECU has detected that the engine oil pressure has
fallen below its configured low oil pressure alarm level.
Under Speed
The engine ECU has detected that the engine speed has fallen
below its configured under speed alarm level.
Over Speed
The engine ECU has detected that the engine speed has risen
above its configured over speed alarm level.
Low Fuel Level
The engine ECU has detected that the engine’s fuel level has
fallen below its configured low fuel level alarm.
Battery Under/Over Voltage
The engine ECU has detected that the engine’s DC supply has
fallen below or risen above its configured alarm level.