Description
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Woodward |
| Model | 9907-018 |
| Product Series | 2301A |
| Product Type | Electronic Load Sharing and Speed Control |
| Supply Voltage | 20–40 VDC |
| Power Consumption | Maximum 15 W |
| Actuator Output | 0–200 mA |
| Actuator Direction | Forward-acting |
| Actuator Configuration | Single actuator |
| Speed Control | Electronic governor control |
| Load Sharing | Supported |
| Speed Range Selection | 500–1,500 Hz; 1,000–3,000 Hz; 2,000–6,000 Hz; 4,000–12,000 Hz |
| Speed Signal Input | Magnetic pickup or compatible speed sensor |
| Load Sharing Signal | Refer to the 2301A wiring and configuration documentation |
| Deceleration Ramp | Not included |
| Operating Temperature | Verify against the applicable hardware revision and manual |
| Storage Temperature | -40°C to +85°C, as reported in product documentation |
| Installation | Panel-mounted industrial control cabinet |
| Certification | CE / CSA listings; verify nameplate and applicable certification records |
The manufacturer manual identifies 9907-018 as a low-voltage, forward-acting model with a single 0–200 mA actuator output. Its power supply requirement is 20–40 VDC.
Product Introduction
Woodward 9907-018 Electronic Speed and Load Sharing Controller
The Woodward 9907-018 is a low-voltage electronic governor controller in the 2301A series. It regulates engine or turbine speed by processing speed feedback and generating a 0–200 mA command for a compatible forward-acting actuator. It is designed for applications involving diesel engines, gas engines, and turbine-driven generator systems.
Its single-actuator configuration and load-sharing capability make it suitable for generator installations requiring coordinated prime-mover control. The 20–40 VDC supply requirement is particularly important when replacing an existing governor. Verify actuator characteristics and control-system wiring before installation.
9907-018
Application Scenarios & Field Pitfalls
Engineering Pain Point
A generator running in parallel with other units begins experiencing unstable frequency or uneven load distribution. Operators may initially suspect the engine, fuel system, or alternator. However, an incorrect governor actuator signal, speed pickup fault, or load-sharing circuit problem can produce similar symptoms.
The Woodward 9907-018 addresses electronic speed regulation and load-sharing requirements in these installations. It is not a universal replacement for every 2301A controller. Its forward-acting output, single-actuator arrangement, and low-voltage supply must match the existing engine control architecture.
Typical Applications
- Diesel Power Generation: Engine speed regulation and load distribution across parallel generator sets.
- Marine Engineering: Governor control for auxiliary diesel generator engines operating in parallel.
- Gas Turbine Systems: Prime-mover speed regulation in turbine-driven power generation equipment.
- Industrial Utilities: Engine-driven standby generators supplying emergency electrical power to manufacturing facilities.
Technical Pitfalls to Avoid
1. Forward-Acting Versus Reverse-Acting Configuration
This is one of the most important replacement checks.
The 9907-018 is a forward-acting controller with a single 0–200 mA actuator output. A reverse-acting controller may respond differently when the actuator signal decreases or disappears.
Never substitute a reverse-acting model simply because its supply voltage and actuator current ratings appear identical. Verify the mechanical governor arrangement and the engine’s fuel-control response.
2. Speed Pickup Signal and Frequency Selection
The 2301A controller provides selectable speed ranges:
- 500–1,500 Hz
- 1,000–3,000 Hz
- 2,000–6,000 Hz
- 4,000–12,000 Hz
The selected range must accommodate the actual magnetic pickup frequency at operating speed. Incorrect selection can prevent proper speed regulation or cause unstable governor response.
Check pickup wiring, shielding, air gap, and signal amplitude before adjusting governor gain.
3. Power Supply and Load-Sharing Wiring
The 9907-018 requires a 20–40 VDC supply. Do not connect it to a 110/220 VAC control supply.
For parallel generator operation, inspect the load-sharing connections, polarity, grounding, and associated current-transformer and potential-transformer circuits. Incorrect wiring can produce unequal load distribution or unstable generator operation.
Field recommendation: Record the original controller’s potentiometer positions, terminal wiring, speed range selection, and actuator response before removing it. Commission the replacement under an approved generator test procedure, including load acceptance and parallel-operation checks.
Related Products
The following Woodward models belong to the 2301A 9905/9907 load-sharing and speed-control family. They provide useful comparison points when selecting replacement controllers.
| Model | Product Description | Compatibility and Application Differences |
|---|---|---|
| 9907-019 | Reverse-acting speed controller, 0–200 mA | Alternative to 9907-018 where the actuator system requires reverse-acting control. Not a direct electrical replacement without checking actuator behavior. |
| 9907-023 | Forward-acting speed controller, 0–200 mA | Related low-voltage 2301A model with a single-actuator configuration. Check its exact nameplate and application configuration before substitution. |
| 9907-024 | Reverse-acting speed controller, 0–200 mA | Suitable for applications designed around reverse-acting actuator behavior. |
| 9905-020 | Forward-acting speed controller, 0–200 mA | Related 2301A model for single-actuator governor applications. |
| 9905-021 | Reverse-acting speed controller, 0–200 mA | Alternative control direction for compatible single-actuator installations. |
| 9905-028 | Forward-acting speed controller with deceleration ramp | Provides a deceleration-ramp option for applications requiring controlled speed reduction. |
| 9905-029 | Reverse-acting speed controller with deceleration ramp | Combines reverse-acting control with the deceleration-ramp option. |
| 9905-030 | Forward-acting speed controller, 0–200 mA | Related 2301A controller for single-actuator applications. |
| 9905-031 | Reverse-acting speed controller, 0–200 mA | Related reverse-acting configuration for compatible governor systems. |
The model distinctions above follow the Woodward 2301A model selection tables. The 9905 and 9907 prefixes should not be treated as interchangeable ordering identifiers.
Procurement and Replacement Checklist
Before ordering a Woodward 9907-018, confirm:
- Supply voltage: Existing system operates within 20–40 VDC.
- Actuator: Single actuator with a 0–200 mA requirement.
- Control direction: Forward-acting configuration.
- Speed pickup: Compatible input frequency and selected speed range.
- Load sharing: Existing generator synchronization and load-sharing architecture.
- Condition: Confirm whether the supplied unit is new surplus, unused, or previously operated.
- Testing: Request nameplate photographs, hardware identification, and functional test documentation.
Important: The 9907-018 does not include the optional deceleration ramp. Do not approve a replacement based on the 2301A series designation alone. The complete part number and control characteristics must match the installed application.
