Manual 36523B
DPG-2201-00X Digital Controllers
Woodward
38
Engine Does Not Reach
Set Speed (cont’d.)
PID values are too high. Tuning is too hot or oversensitive to small
speed errors, which causes the controller to make large, rapid
changes in actuator drive signal, creating an average signal that is
inadequate.
The Integral Low Limit setting is too high. Return the value to the
default setting of zero.
The Integral High Limit setting is too low. Return the value to the
default setting of 99.
Engine Takes Too Long to
Reach the Set Speed
Improve PID tuning.
Integral setting is too low.
Startup Rate setting is too low.
Accel Rate setting is too low.
Speed Filter setting is too high.
Engine Does Not Track Speed
Setting Changes
Is the LED decimal point blinking? If not, enter password.
Is the selected set speed parameter being modified?
A PID value or an OVG value is too high.
A PID value is too low or zero.
Accel Rate is set too low.
Decel Rate is set too low.
Excessive Smoke at Startup
Improve PID tuning.
Use a lower Startup Rate setting.
Use a lower Startup Limit setting.
Low MPU signal voltage. It should read 2.0 VRMS minimum.
Sluggish Response to
Load Changes
Gain too low.
Improve PID tuning.
Speed filter setting is too high.
Engine Instability With No Load
Improve PID tuning.
Speed filter setting is too low.
Fuel is restricted. Check actuator linkage.
Battery voltage is too low.
Engine Instability With Load
Improve PID tuning.
Fuel is restricted. Check actuator linkage.
Battery voltage is too low.
Engine Unable to Carry
Rated Load
PID values may be too high, causing the controller to overreact and
make large, rapid changes in PWM duty cycle output to the actuator.
Improve PID tuning.
Torque limit is set too low. Increase the torque limit.
Fuel is restricted. Check actuator linkage.
Load Sharing Does Not Work
Measure the ILS input signal to see if the measurement is between
2.375 VDC and 2.625 VDC.
Use shielded wiring.
Droop Does Not Work
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.
Modify or adjust actuator linkage to increase range of actuator loading.
If finer droop control is required, then use a DPG-2223-00X controller.
