User manual

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2.5 Speed Inputs
Menu Location
Page
1
Speed
Sensing
Advanced Setup > Speed Sensing
55
The GSC400 senses engine speed via two spade terminals on the bottom of the
unit (not needed for J1939). Magnetic input, generator AC voltage, or J1939 can
be used.
2.5.1 Generator AC Voltage / Magnetic Pickup
Two wires must be run to the speed inputs (even if using generator output). The
AC Voltage Sensing terminals provide the AC voltage level and frequency while
the speed inputs provide the engine speed sensing.
Either L-N or L-L AC voltage can be connected to the speed inputs up to a
maximum of 300VAC.
Magnetic Pickup
If you are using a magnetic pickup sensor you must know the number of teeth of
the flywheel you are measuring. This is needed to configure the GSC400 speed
sensing.
An alternative is to let the generator run at its rated speed (the speed at which it
produces power) and measure the AC frequency with a multimeter. Then you
can enter this frequency directly instead of calculating the frequency based on
the number of teeth. See the speed sensing configuration in the next chapter for
more information.
2.5.2 J1939
If using an electronic engine you do not need to connect anything to the speed
inputs.
2.5.3 Troubleshooting
 Symptom: Speed is zero, generator won’t stop cranking.
Speed 1 and 2 terminals (J17, J18) need to be connected to generator output.
 Symptom: Turns off starter prematurely or does not turn on starter and
then goes into a low speed or low AC voltage failure without starting the
generator.