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gmillsSep 7, 2025
What to do if my Woodward 9905 Control Unit is faulty?
- TTerry CaldwellSep 7, 2025
If you suspect a faulty control, consider replacing it.
What to do if my Woodward 9905 Control Unit is faulty?
If you suspect a faulty control, consider replacing it.
What to do if the common + source is connected to the wrong terminal on my Woodward Control Unit?
If the common + source for contacts connected to terminals 14, 17, 18, and 19 is taken from terminal 16 instead of terminal 0, connect the + source for these terminals to terminal 0, not 16.
What does it mean if the Start Fuel Limit is inactive in my Woodward 9905 Control Unit?
On power up, the Fuel Limit can be bypassed if the MPU signal clears in less than 1 second.
What does it mean if the 2301A control does not cut back the actuator voltage on my Woodward 9905?
If the control does not cut back the actuator voltage [T20 (+) and T21 (–)] until the speed setting is completely counterclockwise, the 2301A control may be faulty, or may have the wrong speed range.
What to do if the LOW IDLE SPEED is set fully clockwise on my Woodward 9905?
Turn LOW IDLE SPEED setting counterclockwise with terminal 19 open. Be careful not to overtorque the pot.
General| Type | Control Unit |
|---|---|
| Operating Temperature | -40°C to 70°C |
| Storage Temperature | -40°C to 85°C |
| Humidity | 5 to 95% RH, non-condensing |
| Vibration | 2 g |
| Shock | 15 g, 11 ms half-sine |
| Input Voltage | 24 VDC (18 to 32 VDC) |
| Communication Protocols | Modbus TCP, Modbus RTU, Ethernet/IP |
Covers warnings about personal injury, overspeed protection, and proper equipment use.
Details potential equipment damage from misuse, battery handling, and electrostatic discharge.
Sets initial potentiometer values and guides the prime mover start-up process.
Adjusts GAIN, RESET, and ACTUATOR COMPENSATION for optimal system response.
Diagnoses issues like failure to start, actuator movement, and incorrect speed settings.
Addresses overspeed, excessive smoke, instability, and load sharing malfunctions.
