Calibration Instructions; Basic Adjustments; Calibration Techniques - Kohler Decision-Maker 1 Manual

10.9 Calibration Instructions

(Digital Isochronous Governor
Programming Kit GM39344)

10.9.1 Basic Adjustments

The governor controller is programmed at the factory
with default setting parameter settings. These settings
allow the controller to operate but usually require some
further adjustments to obtain the best system
performance. In order to bring the engine up to a single
speed for the first time, the user needs to adjust the
parameters shown in Figure 10-20. Use the Calibration
Instructions only when the Governor Parameter
Summary does not include a specific generator set/
engine combination.
The parameters listed in Figure 10-20 are the primary
items to get the governor controller tuned and the
engine running smoothly. It is recommended that the
default settings in Figure 10-20 be initially used and
then adjusted to satisfy the generator set/engine
application. Leave all other parameters at their default
settings until the primary parameter settings are
determined.
Parameter No. Parameter Name
2 Set Speed A
5 Proportional
6 Integral
7 Derivative
8 OVG @ Set Speed A
11 Gain Factor *
Speed Filter [
12
* Modify the Gain Factor only when the PID or OVG values
reach their min./max. parameters.
[ The Speed Filter value should be set to 24 for 3- or 4-cylinder
engines. Use a value of 16 for 6- or 8-cylinder engines.
Figure 10-20 Primary Parameter Setup

10.9.2 Calibration Techniques

After the engine is running, use the following procedure
to determine optimum values for the Proportional,
Integral, and Derivative (PID) values and the Overall
Gain Parameters (OVG). The goal is to find PID values
that allow the governor controller to govern the engine
optimally at all loads while only requiring gain
adjustment. Use the following steps:
1. Calibration Procedure.
The governor controller default programming
provides the values shown in Figure 10-20. It is
recommended to connect a load bank to the
generator set in an effort to provide varying loads.
TP-6356 4/12
Default Value
1000
25
50
25
20
Figure 10-21 Relationships of DIP
20
18
Note: Steps 1.f. through 1.j. require varying the
generator set load to cause engine speed
changes. Start with small load variations
and continue with greater load changes to
provide a better overall performance test.
With Integral, a speed error may persist after a
load-on load-off transition.
through 1.i., temporarily increase the Integral to
get the engine speed back to the set speed, and
then reset the Integral to a lower value again while
working to find good Proportional and Derivative
values.
Repeat steps 1.f. through 1.k. as needed to find
Proportional, Integral, and Derivative values that
work well with a variety of overall gain values and
different load transients. See Figure 10-21.
The Derivative works on the
instantaneous rate of change
in the amount of error
+E
0
--E
Integration works on
the sum of the errors
accumulated over time
a. Open the line circuit breaker to disconnect the
load from the generator set.
b. Place the generator set master switch in the
RUN position to start the generator set.
c. Set the Set Speed A to 1800 rpm for 60 Hz
models and 1500 rpm for 50 Hz models.
d. Set the Integral and Derivative values to 0.
e. Set the Overall Gain low (less than 20).
f. Increase the Proportional value until the engine
shows continuous oscillations greater than
2 Hz.
g. Reduce the Proportional value by 25%--50%.
h. Close line circuit breakers to connect load to
the generator set.
Section 10 Governor Adjustments
During steps 1.c.
The Proportional
term's output is
unique for each
measured error
Time
TT-1399
209