212 Section 10 Governor Adjustments TP-6356 4/12
Symptom RemedyPossible Cause
Engine does not
reach set speed
Improper Proportional, Integral, and Derivative (PID)
tuning values.
Check and adjust the PID values.
Integral value is too low or zero. Increase the integral value.
Derivative value is too low or zero (load share model). Increase the derivative value.
PID values are too low. A tuning that is too s oft can
prevent the governor from delivering the needed
actuator drive signal to reach the set speed.
Check and adjust the PID values.
PID values are too high. Tuning is too hot or
oversensitive to small speed errors causing the
governor to make large, rapid changes in actuator drive
signal, creating an average signal that is inadequate.
Decrease PID tuning values.
The integral low limit setting is too high. Return the integral low limit value to the default setting of zero.
The integral high limit setting is too low. Return the integral high limit value to the default setting of 99.
Engine takes too
long to reach the
set speed
Improper PID tuning values. Check and adjust the PID values.
Integral setting is too low. Increase the integral value.
Startup rate setting is too low. Increase the startup rate value.
Accel rate setting is too low. Increase the Accel rate value.
Speed filter setting is too high. Decrease the speed filter value.
Engine does not
track speed setting
changes
Is the LED decimal point flashing (load share model)? If yes, enter password.
Is the LED flashing fast (3 Hz) (non-load share model)? If no, check speed sensing circuit.
Is the selected set speed parameter being modified? If yes, speed setting display is unavailable during changes.
A PID value or an OVG value is too high. Decrease the PID values or OVG value.
A PID value is too low or zero. Increase the PID value.
Accel rate is set too low. Increase the Accel rate value.
Decel rate is set too low. Increase the Decel rate value.
Excessive smoke
at startup
Improper PID tuning values. Check and adjust the PID values.
The startup rate is too high. Use a lower startup rate value.
The startup limit is too high. Use a lower startup limit value.
No/low MPU speed signal present. MPU should be
2.0 VRMS minimum.
Adjust the MPU gap. Try reversing the MPU leads; otherwise,
replace the MPU.
Slow response to
load changes
Gain value set too low. Decrease the gain value.
Improper PID tuning values. Check and adjust the PID values.
Speed filter setting is too high. Decrease the speed filter value.
Engine instability
with no load
Improper PID tuning values. Check and adjust the PID values.
Speed filter setting is too low. Increase the speed filter value.
Fuel flow is restricted. Check actuator linkage.
Battery voltage is too low. Charge or replace the battery.
Engine instability
with load
Improper PID tuning values. Check and adjust the PID values.
Fuel flow is restricted. Check actuator linkage.
Battery voltage is too low. Charge or replace the battery.
Engine unable to
carry rated load
PID values may be too high, causing the governor to
overreact and make large, rapid changes in PWM duty
cycle output to the actuator.
Check and decrease the PID values.
Improper PID tuning values. Check and adjust the PID values.
Torque limit is set too low (load share model). Increase the torque limit.
Fuel flow is restricted. Check actuator linkage.
Load share does
not work (load
share model)
No/low ILS input signal present. ILS should be
2.375--2.625 VDC.
Check ILS wiring; otherwise, replace the ILS.
ILS signal wiring having electrical interference
problems.
Use shielded wiring.
Droop does not
work (load share
model)
The no load and full load values are not calibrated. Perform the droop calibration procedure.
Difference between no load and full load calibration
values is too small. Should be > 100 for best
performance.
Adjust the no load and/or full load calibration values.
Actuator linkage range too small. Modify or adjust actuator linkage to increase range of actuator
loading.
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