Volts Per Hertz (Hz) Adjustments (Droop) - Kohler 17RES Manual

2. Start the generator set.
3. Follow the controller instructions in Figure 5-19 to
enter the adjustment mode. Increase or decrease
voltage (parameter 1P) until the output reaches the
desired voltage. See Figure 5-15.
Voltage
Measurement
Models
L -- L0
1 phase, 60 Hz
1 phase, 50 Hz L -- L0
L -- L0
3 phase, 50 Hz
Figure 5-15 Voltage Measurement
4. Follow the controller instructions to step to the
voltage gain (parameter 2P) adjustment menu.
Adjust the voltage gain (2P) until the light flicker
minimizes. Save the settings. See Figure 5-21.
5. Check and readjust the voltage if necessary.
6. Set the voltmeter to measure frequency. Adjust the
engine speed to the cut-in frequency shown in
Figure 5-16 by adjusting the engine governor
speed (parameter 4P) through the ADC controller.
See Figure 5-20.
Frequency Cut-In Frequency
60 Hz 57.5 Hz
50 Hz 47.5 Hz
Figure 5-16 Cut-In Frequencies
7. Set the voltmeter to measure voltage. Adjust the
volts/Hz (parameter 3P) until the voltage level
measured by the voltmeter begins to drop. When
set, the generator (as load is applied) attempts to
maintain normal output until the engine speed
drops below the cut-in frequency set in step 6.
Note: See Section 5.8.2 for more information
about the volts/Hz (droop) adjustment.
8. Set the voltmeter to measure frequency. Adjust the
engine speed to the operating frequency (50 or
60 Hz) by adjusting the engine governor speed
(parameter 4P) through the ADC controller.
9. Readjust the voltage gain (parameter 2P) until the
light flicker minimizes, if necessary.
10. Check the voltage.
(parameter 1P), if necessary.
11. Save the settings.
instructions.
TP-6519 8/17
Approximate
Voltage, VAC
120
L - L 240
115
L - L 230
230
L - L 400
Readjust the voltage
Refer to Figure 5-21 for
Note: The controller will revert to the previous
settings at the next startup if the changes
are not saved.
12. Stop the generator set.
5.8.2 Volts per Hertz (Hz) Adjustments
(Droop)
Refer to Section 5.8 and the instructions in the
generator set installation manual to adjust the volts/Hz
using controller parameter 3P.
When the frequency falls below the cut-in frequency
(see Figure 5-17), output voltage is reduced to relieve
the engine. The magnitude of the voltage reduction is
set by the 3P parameter. Monitor engine speed and
output voltage as loads are applied.
If there is excessive droop in engine speed and little
D
droop in voltage, increase the 3P value.
If there is little engine speed droop but excessive
D
voltage droop, decrease the 3P value.
Readjust the voltage stability (2P) and voltage (1P)
D
parameters after adjusting the 3P setting, if
necessary.
Remember to save your settings.
D
Frequency Cut-In Frequency
60 Hz 57.5 Hz
50 Hz 47.5 Hz
Figure 5-17 Cut-In Frequencies
Each step of 3P changes the amount of voltage droop
approximately 0.5% of system voltage for each cycle
(Hz) below the cut-in frequency. See Figure 5-18.
Voltage Droop, % of System Voltage per
1 Hz Cycle Below Cut- -In Frequency
3P
0
1
2
3
4
5
6
7
8
9
Figure 5-18 Voltage Droop Adjustments
Section 5 Component Testing and Adjustment
0
0.5%
1.0%
1.5%
2.0%
2.5%
3.0%
3.5%
4.0%
4.5%
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