Woodward 9907-018 Speed Governor Control Module

Description

3. Key Technical Specifications

4. Product Introduction & Supply Chain Strategy

The Woodward 9907-018 is a 24 VDC 2301A load sharing and speed control module designed to regulate prime movers, including industrial gas turbines, steam turbines, and diesel generator sets. Processing speed signals from a magnetic pickup (MPU), it outputs a precise 0–200 mA drive current to position the governor actuator, maintaining steady-state frequency control and balanced load division across parallel generator systems.

This product is a Brand New Surplus unit. It is not used, not pulled from a decommissioned plant, and not refurbished. All modules undergo rigorous quality verification to ensure OEM-level reliability. Stocking a New Surplus 9907-018 guarantees immediate protection against unexpected control loop failures on legacy prime movers without requiring a costly system retrofit. Refurbished speed controls often contain aged electrolytic capacitors, thermal stress on internal output transistors, and worn potentiometer wipers that lead to frequency hunting or loss of speed control. Buying genuine New Surplus hardware ensures original factory calibration tolerances, zero pin wear, and extended operating life.

9907-018

9907-018

5. Installation & Configuration Guide

1

Pre-Installation Preparation & Safety

Apply LOTO to power and prime mover starting systems

1.Pre-Installation Preparation & Safety:Apply LOTO to power and prime mover starting systems.

Execute strict Lockout/Tagout (LOTO) protocols on the engine starter system and control power supply. Strap on a grounded ESD wrist band before touching module terminals. Take photos and label each field conductor connected to the existing control board.

2

Legacy Module Removal

Disconnect field wiring and unbolt mounting chassis

2.Legacy Module Removal:Disconnect field wiring and unbolt mounting chassis.

Carefully loosen the screw terminal connections and disconnect incoming 24 VDC power lines, MPU signal wiring, load sensor lines, and actuator cables. Remove the mounting hardware from the base chassis and set the old unit aside.

3

Mechanical Installation & Trim Matching

Mount module and set initial potentiometer positions

3.Mechanical Installation & Trim Matching:Mount module and set initial potentiometer positions.

Secure the new 9907-018 module into the panel enclosure using the baseplate mounting holes. Measure the physical dial positions of all tuning potentiometers (Rated Speed, Gain, Stability, Actuator Compensation) on the removed unit and set the new 9907-018 potentiometers to match these baseline positions. Reattach all field wiring.

4

Power-On & Loop Commissioning

Verify MPU voltage levels and perform dynamic tuning

4.Power-On & Loop Commissioning:Verify MPU voltage levels and perform dynamic tuning.

Energize the 24 VDC supply rail and check terminal polarity. Start the engine and measure the MPU AC voltage (must exceed 1.5 VRMS during cranking). Once at operating speed, adjust the Gain and Stability potentiometers to achieve a smooth, bump-less recovery following transient load changes.

6. Firmware/Software Versions & Upgrade Notes

• Hardware Architecture: The 9907-018 is a fully analog electronic speed control; it does not utilize firmware, operating systems, or digital programming software.
• Voltage Verification: Ensure your power rail matches the 18–40 VDC operating range of the 9907-018. Applying high-voltage AC (such as 120 VAC) will damage the low-voltage internal circuitry.
• Actuator Drive Output: Verify that the actuator current range jumper on the terminal board matches your specific actuator coil specifications (0–200 mA output).

7. Frequently Asked Questions (FAQ)

Q: Is this Woodward 9907-018 speed control New Surplus stock or a refurbished unit? A: This module is 100% Brand New Surplus stock. It has never been installed on active equipment, shows zero backplane or terminal pin wear, and is stored in original protective packaging.

Q: Why should I choose New Surplus over a refurbished speed governor control? A: Analog speed controllers depend on tight component tolerances. Refurbished boards often have aged capacitors and worn trim potentiometers that cause frequency drift, load imbalances, or speed hunting under heavy load changes. An unstable governor can trip a primary generator set or cause engine overspeed damage. Buying New Surplus eliminates these risks and provides long-term operational reliability.

Q: Can the 9907-018 operate in parallel with other generator sets? A: Yes. The 9907-018 supports Isochronous Load Sharing mode when connected to compatible Woodward load sensors, as well as Droop mode for paralleling with utility grids or standard generator buses.

Q: How do I correct engine speed hunting during commissioning? A: Speed hunting is resolved by adjusting the Gain and Stability potentiometers. Turn the Gain counter-clockwise slightly to reduce system sensitivity, then adjust Stability clockwise until the frequency stabilizes cleanly under both loaded and unloaded conditions.

Q: What warranty applies to this New Surplus Woodward unit? A: The Woodward 9907-018 module is covered by a full 1-year replacement warranty protecting against hardware defects and functional failures.