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Woodward 9905-211 701A Digital Speed Control

Woodward 9905-211 701A Digital Speed Control

Technical Overview

The 9905-211 is a microprocessor-based digital speed controller designed for precise regulation of gas and diesel engines, as well as steam and gas turbines. It provides high-speed response, programmable PID control, and robust...

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Availability: Low stock: 99 left

SKU: 9905-211
Vendor: Woodward
Category: Digital Speed Controls
Related Series:

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Technical Overview

The 9905-211 is a microprocessor-based digital speed controller designed for precise regulation of gas and diesel engines, as well as steam and gas turbines. It provides high-speed response, programmable PID control, and robust actuator management, ensuring stable RPM under varying load conditions. This controller is widely used in power generation, mechanical drives, and turbine control applications where synchronous speed and droop regulation are critical.

Detailed Specifications

Item Specification
Model 9905-211
Series 701A Digital Speed Control
Input Power Supply 18–40 VDC (Standard 24 VDC systems)
Primary Input Signal 0–20 mA or 4–20 mA analog speed reference
Speed Sensing Magnetic Pickup (MPU) input compatible
Control Output Dedicated actuator driver, 0–200 mA typical
Serial Interface RS-232C for Handheld Programmer or PC
Mounting Panel-mount rugged chassis
Configurable Parameters Idle/rated speeds, acceleration/deceleration ramps, PID gains
Operating Temperature -40°C to +70°C 
Protective Features Multi-level password protection, ESD and vibration resistant
Net Weight 1.81 kg 

Operational Capabilities

  • PID-Based Speed Control: Calculates real-time actuator adjustments to maintain precise engine or turbine speed.

  • Start & Ramp Logic: Ensures smooth engine start and transition to rated speed without overshoot.

  • Non-Volatile Memory: Retains programmed constants during complete power loss for immediate restart.

  • Safety Protections: Includes “Loss of Speed Signal” logic to prevent overspeed conditions.

Technical FAQ

How is the 9905-211 programmed?

  • Programming is done via RS-232C using a Woodward Handheld Programmer or Watch Window PC software. PID gains and speed parameters can be tuned in real time.

Does this controller support dual-fuel applications?

  • The 9905-211 is primarily a single-actuator controller. Dual-fuel or complex load-sharing setups require additional modules (e.g., Woodward 2301D or Peak 200 series).

What happens if the speed sensor (MPU) fails?

  • The controller immediately disables the actuator output to prevent engine or turbine overspeed.