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ENGINE/GENERATOR PROTECTIVE DEVICES
The unit may be required to operate for long periods of time without an operator on hand to monitor operating
conditions. For this reason, the unit has numerous sensors to provide the control panel with the information it needs
to protect both the engine and generator. The control panel is designed to shut down the engine if potentially damaging
conditions occur. These conditions can include low oil pressure, high coolant temperature, low coolant level, engine
overspeed, over or under voltage, over or under frequency, etc. These settings are configured at the factory and can
be changed/adjusted by an Independent Authorized Service Dealer if required.
DIGITAL CONTROLLER
The generator leaves the factory with the controller warning set at 105% load and shutdown set at 110% load. The
unit is equipped with a digital controller with paralleling capabilities. The paralleling feature allows the operator to
synchronize multiple controllers and distribute the load between units. Contact Generac Mobile Products Technical
Support for more information about this feature.
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1. Horn Reset: Deactivates the horn (audible alarm).
Mode ←: Cycles backward through genset operation modes.
2.
Mode →: Cycles forward through genset operation modes.
3.
Fault Reset: Acknowledges faults and alarms.
4.
Start: Starts the genset in manual (MAN) mode.
5.
Stop: Stops the genset in manual (MAN) mode.
6.
Bus: Green LED is on if bus voltage is present and within limits.
7.
GCB ON: Green LED is on if generator circuit breaker feedback is active. Flashes during synchronizing.
8.
Genset Failure: Red LED starts flashing when any failure occurs. After Fault Reset button is pressed,
9.
changes to steady light (if an alarm is still active) or is off (if no alarm is active).
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Figure 10 - Digital Controller Pushbuttons and LEDs
MGG155/210 Operating Manual
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General Information
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Table of Contents
Troubleshooting
