Woodward | 9907-164 (Revision M) | 505 / 505E Digital Governor Control

Woodward Peak 150 Digital Controller Part Number 9905-852 Rev N Image 1 of 4

⚙️ Product Specifications

Brand: Woodward
Model / Part Number: 9907-164 (Revision M)
Series: Woodward 505 / 505E Microprocessor-Based Digital Governor Series
Product Name: Steam Turbine Digital Speed and Load Controller
Origin: USA
Status State: Active / Refurbished / Legacy Support
Dimensions: Approx. 14″ W x 11″ H x 4″ D (35.6 \times 27.9 \times 10.2 cm)
Weight: Approx. 9.11 lbs (4.13 kg)
Country of Origin: USA
Power Rating: +24 V DC at 1 A nominal

📖 Operation Guidelines & Usage Instructions

The Woodward 9907-164 is a microprocessor-based digital controller designed to provide precise speed, load, and valve position control for steam turbines utilizing single extraction or admission split-stage actuators.

Safety & Handling: Ensure all external power feeds, actuator loops, and auxiliary control inputs are completely isolated, locked out, and tagged before handling or servicing the unit. Always wear a grounded electrostatic discharge (ESD) wrist strap when accessing internal components.
Interface & Configuration: The controller features an integrated 30-key multi-function keypad and a 2-line by 24-character vacuum fluorescent/LCD display for local monitoring, operator commands, and field configuration. Settings can also be adjusted remotely using Woodward configuration software via the onboard RS-232/RS-422 Modbus communication ports.
Maintenance: Regularly inspect rear terminal block screw torques, verify magnetic pickup (MPU) speed sensor clearance and wiring integrity, and monitor internal error codes through the control software.

⚡ Power-Up / Power-Down Sequence

Power-Up Sequence: Verify that all field wiring—including power inputs, MPU speed probes, 4-20 mA analog control loops, contact inputs, and actuator output cables—is correctly terminated and securely fastened to the rear barrier strips. Apply the +24 V DC control power supply. Observe the front-panel display and LED indicators to verify proper self-diagnostic boot routines and system readiness.
Power-Down Sequence: Safely ramp down turbine load, trip the unit or place the governor in manual/shutdown mode via the operator interface before removing power. Turn off the dedicated +24 V DC power distribution source and isolate all external loop supplies prior to disconnecting wiring or removing the controller.

❓ Frequently Asked Questions (Q&A)

Q: What is the primary application of the Woodward 9907-164 controller?
A: It is engineered specifically for steam turbines, turbo-expanders, and turbo-generators requiring exact speed control, overspeed protection, and single extraction or admission valve regulation.
Q: What communication protocols are supported for external integration?
A: It includes serial communication interfaces (RS-232 and RS-422) supporting Modbus RTU protocol for seamless connection to distributed control systems (DCS), supervisory control and data acquisition (SCADA), or human-machine interface (HMI) monitoring platforms.

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