Reactive Droop Compensator Alternate Adjustment Procedure; Testing - Kohler Decision-Maker 1 Manual

5. Check the droop compensation on each unit as
follows:
a. With unit no. 1 operating at the desired speed
and voltage, apply an inductive load 1/2 to full
load. Do not use a resistive load for this test.
b. Observe the voltmeter on unit no. 1 with the
reactive droop compensator rheostat set at
minimum. As the rheostat is turned CW, the
voltmeter should show a decrease in voltage. If
observing a larger voltage, stop the generator
sets and reverse the direction of the generator
set load line through the current transformer or
reverse the transformer leads on unit no. 1.
c. Restart the generator sets and recheck the
droop on unit no. 1.
d. Set the reactive droop compensator rheostat to
a value at approximately 4% below rated
voltage at full load. As an example, the voltage
droops (decreases) 19.2 volts on a 480-volt
system at full load or 9.6 volts at 1/2 load. Use
the following formula for loads other than full
load:
Rated Voltage x 0.04 x Actual Load (expressed
as a % of full load) = Voltage Droop
Note: With full load 0.8 power factor, a droop of
3%--5%
paralleling.
6. Repeat step 5 for generator set no. 2. Adjust unit
no. 2 where the voltage droop is equal and at the
same point as on unit no. 1. The two units share
reactive currents proportionately after correctly
performing this procedure.
7. If reactive load
Section 8.16.3, Reactive Droop Compensator
Alternate Adjustment Procedure. If reactive load is
available, go to Section 8.16.4, Testing.
8.16.3 Reactive Droop Compensator
Alternate Adjustment Procedure
Initially calibrate each generator set using the following
procedure.
1. Turn the reactive droop compensator rheostat on
generator set no. 1 to the minimum setting.
2. Remove the controller cover. Move the voltage
sensing lead from V7 to V9 at the AC fuse terminal
block.
3. Remove any load connected to the generator set.
140 Section 8 Component Testing and Adjustment
should be adequate
is not available, go
4. Start the generator set by placing the generator
master switch in the RUN position.
5. Use the controller or remote voltage adjusting
potentiometer on each generator set to fine adjust
voltage as necessary.
6. Apply resistive load (1.0 power factor) until
reaching rated current.
7. Adjust the reactive droop compensator rheostat to
achieve a 4% droop (decrease) in voltage.
8. Remove the resistive load.
9. Stop the generator set by placing the generator
master switch in the OFF position.
10. Return the voltage sensing lead from V9 to V7 at
the AC fuse terminal block.
11. Replace the controller cover.
12. Repeat steps 1--11 for generator set no. 2.

8.16.4 Testing

Use the following procedure to check that the generator
sets share the reactive load proportionately.
1. Parallel the units at 1/2 to full load. Verify that each
unit carries equal kW load or a load proportional to
for
its capacity using the wattmeter readings. If load
unbalance exists, adjust and
electronic governor throttle control to correctly
balance loading. Engine speed determines load
sharing ability.
2. With the load balanced, check the ammeters for
equal current or proportional according to capacity.
If the currents are incorrect, adjust the reactive
to
droop compensator rheostat reducing the current
of the unit with the highest reading. Reduce the
current to an equal division or proportionately.
3. Stop each generator set by placing the generator
master switch in the OFF position.
Note: Step 1 balances the load using the
electronic governor and step 2 balances the
current
compensator.
optimum for parallel operation.
Note: Voltage must droop (decrease) on lagging
power factor loads (inductive loads). A small
change in voltage is acceptable on unity
power factor loads (resistive loads).
recheck the
using the reactive
Consider these settings
TP-6356 4/12
droop