User manual

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3. Controller Operation
3.1 OFF/ AUTO/ RUN Modes
On power up the controller defaults to the mode it was in when power was last removed (AUTO or
OFF). OFF mode can be entered by pressing the OFF button on the front panel. When the GSC300
is in the OFF mode the “Not In Auto” LED will be lit on the front panel (NOT IN AUTO below).
When the GSC300 is in the OFF mode, starting – either from the remote start contacts or from the
front panel run button – is disabled. To start the genset the GSC300 needs to be placed in the
AUTO mode by pressing the AUTO button on the front panel.
Once in AUTO mode the genset can be started by pressing the RUN button.
Once crank success is achieved (i.e. engine has started), the GSC300 enters the RUN mode and the
front panel ENGINE RUNNING LED will be lit. Removing power while the controller is in the RUN
mode may corrupt the EEPROM. If this occurs, the GSC300 will have to be reprogrammed.
3.2 General Failure Conditions
The following conditions can cause the GSC300 controller to shutdown the engine-generator system
unexpectedly.
To reset a failure press the Off key for 3 seconds. This will exit the FAILURE mode and take the
controller back to the OFF mode.
Auxiliary Failure (“XTR_FAIL”) Extra failure is indicated by a flashing RED Low oil pressure LED
Low Oil Pressure Low Oil pressure is indicated by a steady on RED Low oil pressure LED
High Coolant Temperature High coolant temperature is indicated by a steady on RED High water
temp LED
Overcrank Overcrank failure is indicated by a steady on RED Overcrank LED
Overspeed Overspeed failure is indicated by a steady on RED Overspeed LED
Loss of Speed (“SPDLOSS”) Loss of speed signal is indicated by a flashing RED Overspeed LED
The General Failure output annunciation is triggered during any of the above failure conditions and
is rated 300mA Max.
NOT IN AUTO: When the controller is in the OFF Mode, the NOT IN AUTO LED will illuminate
and the NOT IN AUTO Output will be triggered. During this OFF mode Automatic engine starting is
disabled. The LCD display will read “OFF”, and the backlight on the LCD display will be off.
NOTE: + Battery must be permanently connected to the main power terminal for the NOT IN
AUTO feature.
LOW BATTERY VOLTAGE ALARM: When the battery voltage drops below the user defined
set point which can be programmed between 7 and 35VDC, the engine controller displays a Low
Battery Condition. The Low battery warning Led will be illuminated at any time during OFF, AUTO