TP-6735 7/1774 Section 5 Component Testing and Adjustment
5.9.5 Frequency Adjustment
Hazardous voltage. Moving parts.
Will cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
areinplace.
DANGER
Short circuits. Hazardous voltage/current will cause
severe injury or death. Short circuits can cause bodily injury
and/or equipment damage. Do not contact electrical
connections with tools or jewelry while making adjustments or
repairs. Remove all jewelry before servicing the equipment.
The engine speed determines the generator output
frequency; 60 Hz units operate at 3600 rpm and 50 Hz
units run at 3000 rpm. Adjust the engine governor to
change the output frequency using the following
procedure.
The RDC controller can be adjusted using the controller
keypad or using a personal computer running Kohler
SiteTech software. The DC controller has no keypad,
and must be adjusted using SiteTech software.
Note: See Figure 5-15 for instructions to adjust engine
governor speed (frequency) and gain.
Frequency Adjustment Procedure
1. Open the generator set line circuit breaker.
2. Attach a frequency meter to the AC output leads.
3. Start and run the generator set until it reaches
normal operating temperature (at least 10 minutes).
4. Use the RDC controller to adjust the electronic
governor speed (parameter 4P) to obtain a
frequency reading of 60 Hz (or 50 Hz on 50 Hz
models). See Figure 5-15.
Note: Often hunting/surging problems thought to
be caused by the governor are actually
caused by engine or carburetor problems. If
the generator set speed is unstable, hunts,
or surges, check for the c ause using the
procedure in Section 5.9.3 before
proceeding.
5. Check stability with the generator set running and
with no load applied. If the generator set speed is
unstable, hunts, or surges, decrease the gain
(parameter 5P) until the generator set becomes
stable with no hunting or surging. Observe the
frequency reading.
6. Repeat steps 4 and 5 to obtain the rated frequency
and stable operation.
7. Save the settings. Refer to Section 5.8 for
instructions.
Note: The controller w ill revert to the previous
settings at the next startup if the changes
are not saved within one minute after the
last change.
8. Apply rated load to the generator set and observe
the frequency reading. The no load and full load
frequencies should be within 0.4 Hz of the rated
generator frequency; if not, check that the
carburetor throttle plate opens completely without
sticking and check the carburetor adjustment. If
these procedures do not correct the problem,
replace the controller.
9. Check for hunting and surging at full load. Increase
the gain (parameter 5P) until the engine hunts and
surges. Then decrease the gain in small steps
using the governor gain fine adjust parameter until
the engine operation stabilizes. Save the
controller changes.
10. Remove the load and observe the frequency. The
frequency should return to the value stated in
step 4. Gain adjustment may affect the generator
set speed/frequency. If the frequency has
changed, repeat step 4.
Note: Speed adjustments have no effect on gain
adjustments. It is not necessary to repeat
the gain adjustments (steps 5 and 8) after
adjusting the engine speed.
Check the overspeed shutdown operation when
investigating a shutdown problem. See Section 5.10.1
for the overspeed shutdown test procedure.
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