Murphy EMS-GC10, Operator'S Manual

Page: 46 / 183

Section 75 00-02-0878
2013-03-07 - 40 -
Running Feedback
Different types of running feedback can be used to detect if the motor is running. Refer
to parameters 6170, 6171, 6175 for selection of the running feedback type.
The running detection is made with a built-in safety routine. The running feedback
selected is the primary feedback. At all times, all the types of running feedback is used
for running detection. If, for some reason, the primary choice is not detecting any
running feedback, the starter relay will stay activated for 1 additional second. If a
running feedback is detected based on one of the secondary choices, the genset will
start. This way, the genset will still be functional even though a speed (MPU /
alternator) sensor is damaged or dirty.
As soon as the genset is running, no matter if the genset is started based on the
primary or secondary feedback, the running detection will be made, based on all
available types.
The sequence is shown in the diagram below.
Interruption of Start Sequence
The start sequence is interrupted in the following situations:
Event Comment
Stop signal
Start failure
Remove starter feedback Tacho setpoint.
Running feedback Digital input.
Running feedback Tacho setpoint.
Running feedback W terminal
Running feedback
Frequency measurement above 32 Hz.
The frequency measurement requires a voltage measurement of 30% of
UNOM (normal voltage).
The running detection based on the frequency measurement can replace
the running feedback based on speedo signal (MPU alternator) or digital
input or engine communication (J1939).