Diesel Gen-set Operation Instructions
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4) Stability adjustment shall be selected as per Table 3-3.
Table 3-3 Stability selection list
Serial number
Power range Response speed
B-D
〈
100kW Slow
No connection
〈
100kW Fast
B-C
〉
100kW Fast
5) See Table 3-4 for roles and adjustment methods of AVR adjustment potentiometer.
Table 3-4 Function list of AS480 adjustment potentiometer
Control button
Function
Direction of adjustment
Voltage
Adjust output voltage of
alternator
Turn clockwise to
increase output voltage
Droop (applicable for
parallel connection)
Droop is 5% when power
factor of Gen-set is Gen-set
as 0
Turn clockwise to
increase droop
Stability
Prevent voltage swing
Turn clockwise to
increase damping effect
UFRO (Under-Frequency
Roll Off)
Set UFRO knee point
Turn clockwise to
decrease knee point
frequency
3.4 Regulating method of AVR
Adjustment potentiometer on AVR has been set when being delivered from factory, so
it is unnecessary to adjust other buttons at random except voltage and stability button.
1) Adjustment method of voltage
Counterclockwise turn voltage adjustment button on AVR to the end, then place this
regulator knob to middle position if the alternator is provided with an external voltage
regulator. Start Gen-set and slowly turn voltage regulator on AVR clockwise under
Rated speed until rated voltage is reached.
2) Adjustment method of voltage stability
When adjustment is necessary for the reason of unstable voltage, following operation
