Woodward 9907 Series User Manual (English)

Questions and Answers:

J
Jane BernardAug 20, 2025
What to do if my Woodward Control Unit prime mover will not start and the actuator isn't moving?
- J
  Jose GomezAug 21, 2025
  If your prime mover isn't starting and the actuator isn't moving to the start-fuel position, here are a few things to check: * First, ensure proper voltage from terminals 16 (+) to 15 (–). If it's a DC system and the polarity is incorrect, reverse the leads. * If there's voltage at control terminals 20 (+) and 21 (–) but the actuator remains still, inspect the wiring to the actuator for any opens or shorts. * Also, the start fuel limit might be set too low. Try turning the start fuel limit clockwise until the prime mover starts. * Make sure that actuator moves approximately 2/3 of its travel from no load to full load. * Check the magnetic-pickup output voltage at speeds above idle—it should be at least 1.0 Vrms.
D
Donald MckeeAug 22, 2025
Why does my Woodward 9907 Control Unit prime mover overspeed only on starts?
- K
  kathleenhallAug 22, 2025
  If your prime mover overspeeds only when starting, try increasing the RAMP TIME clockwise. This adjustment can help control the acceleration during startup.
C
Cathy LyonsAug 25, 2025
What should I do if there is no actuator voltage at terminals 20 and 21 on my Woodward Control Unit?
- I
  Isabel MitchellAug 25, 2025
  If you find no actuator voltage at terminals 20 and 21, check for shorted or grounded actuator leads by disconnecting the wires from these terminals.
L
lawrencesheltonAug 27, 2025
How to adjust the GAIN on my Woodward 9907 for stable response?
- A
  Ashley SchultzAug 27, 2025
  To adjust the GAIN for the fastest stable response, slowly adjust the GAIN. Making the GAIN adjustment too quickly can cause issues, so proceed gradually.
E
Edward GonzalezAug 28, 2025
What to do if the speed setting is too low on initial start of my Woodward Control Unit?
- P
  Paula LawsonAug 28, 2025
  If the speed setting is too low on initial start, it's possible the control is the wrong speed range. Check the speed sensor frequency against the control part number. Also, the speed setting may be lower than the cranking speed.
T
Travis JohnsonAug 29, 2025
What to do if the LOW IDLE SPEED setting is too low on my Woodward 9907?
- J
  Joshua HoldenAug 29, 2025
  If the LOW IDLE SPEED setting appears to be too low, adjust the LOW IDLE SPEED potentiometer clockwise to increase it.
W
wtorresAug 31, 2025
What to check if the Minimum Fuel contact is open on my Woodward 9907?
- A
  Anna ClarkAug 31, 2025
  If the Minimum Fuel contact is open, check T 17. For normal operation, the minimum-fuel contact must be closed.
S
smithshannonSep 2, 2025
What to do if terminals 23 and 24 are open on my Woodward 9907 Control Unit?
- A
  Andrew SmithSep 2, 2025
  If you find that terminals 23 and 24 are open, verify that they are jumpered if an optional external speed trim is not being used.
A
Ana BrownSep 4, 2025
How to troubleshoot a faulty speed trim potentiometer in a Woodward Control Unit?
- L
  Laura YoungSep 4, 2025
  To troubleshoot a faulty speed trim potentiometer, turn the power OFF and then check the speed trim potentiometer(s) using an ohmmeter.
K
Kevin MillerSep 5, 2025
What to do if the speed sensor signal isn't clearing the failed speed signal circuit on my Woodward 9907?
- S
  Stephanie WashingtonSep 6, 2025
  If the speed sensor signal isn't clearing the failed speed signal circuit, check the wiring for a proper connection.

Woodward 9907 Series Specifications

General

Category	Control Unit
Manufacturer	Woodward
Operating Temperature Range	-40 to 70 °C
Output Type	Analog
Series	9907 Series
Input Voltage Range	24 VDC nominal (18-32 VDC)