Setup Procedure
Page 25 of 58
057-281 ISSUE: 1
4.3.2.4
DERIVATIVE
NOTE: Proceed below only after setting both Proportional and Integral.
NOTE: If an oscilloscope is not available, the voltmeter and SCADA screen are used
solely. This does not show rapid oscillation of the voltage output and hence does not provide
the optimum setup environment.
NOTE: If the genset is intended for dual frequency operation, the Voltage Set Point Step
test must be completed at both frequencies. If the response is stable at one frequency, but
unstable at the other, adjust the Derivative Set Point and repeat the test.
WARNING!: Use only a suitable insulated preset adjustment tool.
The
Derivative
preset can only be adjusted
by changing the AVR’s configuration file.
The settings is found on the selected
Stability Configuration
page. To begin testing, increment the
Derivative Set Point
in steps of 20. After
making each adjustment, write the configuration to the AVR, and then start the generator. Once this is
done repeat the
Voltage Set Point Step
test, and check the response. A good response should match
the middle oscilloscope trace, shown above. Once this has been achieved, all the stability settings of
the AVR have been satisfactorily set up and do not require further adjustment. Further load
acceptance tests can be performed with a load bank, if deemed necessary.
The below image illustrates the Commissioning Screen from a correctly configured AVR during
Voltage Set Point Step
testing:
Derivative
setting
