Description
Woodward’s model 9905-134 is a reverse-acting speed control unit designed to provide precise speed regulation and governing functions for industrial prime movers. It modulates fuel or steam delivery in a reverse-acting configuration, where an increasing input error signal decreases the output actuator current, making it ideal for specialized turbine and engine control applications requiring inverse governing responses.
📊 Technical Specifications & Datasheet Parameters
• Brand: Woodward
• Model: 9905-134
• Series: Speed Control
• Product Name: Reverse Speed Control
• Place of Origin: United States
• Operational Status: Active / Industrial Grade
• Dimensions: Approximately 200 mm × 150 mm × 80 mm (7.9 in × 5.9 in × 3.1 in)
• Weight: Approximately 1.5 kg (3.3 lbs)
• Country of Origin: United States
• Power Consumption / Power: 20–40 VDC control power supply input (Max 25 W)
⚙️ Operation Standards & Usage Methods
Installation must strictly adhere to the manufacturer’s technical manual and be executed by qualified control system technicians. Mount the unit securely inside a protective NEMA/IP-rated industrial cabinet to shield internal circuitry from ambient moisture, corrosive elements, and high vibration levels. All control wiring, actuator connections, magnetic pickup (MPU) speed sensors, and power input leads must be shielded and properly grounded to eliminate electromagnetic interference (EMI). Verify all switch settings, reverse-acting response characteristics, and gain adjustments before powering on the control loop.
🔌 Power-Up & Power-Down Sequence
Power-Up Sequence:
- Inspect all external wiring, actuator links, speed sensing probes, and terminal block connections to ensure secure termination.
- Apply the 20–40 VDC control power supply to the unit.
- Monitor internal indicator LEDs to confirm successful startup and self-diagnostics.
- Check input signal responses to ensure proper reverse-acting operation before enabling prime mover fuel flow.
Power-Down Sequence:
- Unload the prime mover safely and bring the engine or turbine to a complete stop.
- Disengage any external actuator control signals and lock out fuel or steam delivery systems.
- Remove the 20–40 VDC control power supply from the 9905-134 unit.
- Allow internal components to de-energize completely before performing wiring or maintenance tasks.
❓ Frequently Asked Questions (Q&A)
Q: What does “reverse-acting” mean for the Model 9905-134?
A: In a reverse-acting control configuration, an increase in the input speed error signal results in a decreased output current signal to the actuator, providing inverse control logic required by specific turbine or engine valve designs.
Q: What power supply does this unit require?
A: The controller operates on a direct current power supply input ranging from 20 to 40 VDC.
Q: Can this controller manage prime mover speed reliably?
A: Yes, it is engineered for industrial-grade speed governing, utilizing precise feedback loops to maintain stable operation under varying load conditions.
🚀 Recommended Woodward Models
- Woodward 9905-068 (2301A Load Sharing and Speed Control)
- Woodward 9905-036 (2301A Load Sharing and Speed Control)
- Woodward 9905-032 (2301A Turbine Control with 0-400 mA Actuator)
- Woodward 9905-028 (2301A Diesel/Gasoline Engine Control)
- Woodward 9905-024 (2301A Dual Actuator Control)
- Woodward 9905-020 (2301A Individual Actuator Control)
- Woodward 8272-611 (2301A Load Sharing and Speed Control)
- Woodward 9907-018 (2301A Standard Speed Control)
- Woodward 9907-162 (2301D Digital Load Sharing and Speed Control)
- Woodward 9900-432 (Forward-Acting 110V Load Sharing and Speed Control)
