9905-792 | Woodward Digital Speed Control Board | Brand new

Product Overview

The Woodward 9905-792 is a ProAct Digital Speed Control Module designed for precise speed regulation of engines and turbines in industrial environments. It provides stable actuator output and integrates easily into various control systems, ensuring reliable and efficient operation. This digital speed governor is ideal for AC and DC motor applications including pumps, fans, and generators, offering excellent performance and robust protection features for smooth operation under challenging conditions.

Key Technical Specifications

• Product Type: ProAct Digital Speed Control Module / Digital Speed Governor
• Series: Woodward ProAct / 9905 Series
• Control Type: Digital Speed Governor
• Input Voltage: 24 VDC nominal
• Output Signal: 0–200 mA current to actuator
• Speed Range: Programmable, typically 500–5000 RPM
• Communication Interface: RS-232/RS-485 (Modbus-compatible)
• Mounting: Panel or DIN rail
• Protection Rating: IP65 (sealed enclosure)
• Operating Temperature: -40°C to +85°C (some sources indicate -40°C to +70°C)
• Dimensions: Approx. 20 × 15 × 5 cm (7.87 × 5.91 × 1.97 in)
• Weight: Approx. 1.2 kg (2.65 lbs)
• Origin: USA

Key Features

• Precision Speed Regulation: Maintains consistent speed across wide load variations
• Integrated PID Control: Enhances actuator responsiveness and improves fuel efficiency
• Flexible Programming: Adjustable parameters for various engine types and applications
• Fail-Safe Operation: Retains last known output during signal interruptions to minimize downtime
• Modbus Communication: RS-232/RS-485 for remote configuration and diagnostics
• Comprehensive Protection: Overvoltage, overcurrent, undervoltage, short circuit, and ground fault protection
• Multiple Speed Control Modes: Supports tachometer, current feedback, and voltage feedback modes
• Microprocessor-Based Control: Precise and efficient digital regulation

Applications

• Pumps — speed control for flow optimization
• Fans — ventilation system speed regulation
• Generators — frequency and load control
• Compressors — discharge pressure management
• Conveyors — material handling speed control
• Industrial automation and control systems

Installation Guide

1. Mount on panel or DIN rail in control cabinet
2. Connect 24 VDC power supply
3. Wire speed reference input (tachometer or analog)
4. Connect 0–200 mA output to actuator
5. Wire RS-232/RS-485 for Modbus communication
6. Configure PID parameters and speed setpoints via software
7. Test speed regulation under varying load conditions

FAQ

Q: What is the output current range?
A: 0–200 mA to the actuator.

Q: What communication protocols are supported?
A: Modbus RTU via RS-232/RS-485.

Q: What protection features are included?
A: Overvoltage, overcurrent, undervoltage, short circuit, and ground fault protection.

Q: Is it suitable for outdoor installation?
A: Yes, IP65 sealed enclosure protects against dust and water ingress.

Model Selection Tips

• 9905-792 = ProAct Digital Speed Control for engine/turbine speed regulation
• Verify actuator accepts 0–200 mA input signal
• Confirm 24 VDC power supply availability
• For load sharing applications, pair with 9907-173 or 9905-096
• For synchronizer applications, pair with 9905-708 or 9907-005