General Information
Manufacturer: Woodward

Model Number: 9907-838

Type: Digital Speed Control Module / Governor Card

Compatibility: Designed for Woodward 2301/ProAct control systems

Primary Application: Industrial turbine and engine control systems

Electrical Parameters
Power Supply:

Voltage: 24V DC ±10%

Consumption: ≤15W (typical)

Inputs:

Speed Sensors: 2 channels (magnetic pickup, 50-5000Hz)

Analog Inputs: 4 channels (configurable as 4-20mA or 0-10V)

Digital Inputs: 6 channels (24V DC wet contact)

Outputs:

Analog Outputs: 2 channels (4-20mA, isolated, 500Ω max load)

Relay Outputs: 4 channels (Form C, 5A @ 30V DC)

Performance Specifications
Control Range: 50-5000 RPM (software configurable)

Control Accuracy: ±0.25% of setpoint

Response Time: <100ms for 10% step change

Control Modes:

Isochronous/Droop operation

PID+ control algorithm

Load sharing capability

Environmental Specifications
Operating Temperature: -40°C to +85°C (-40°F to +185°F)

Storage Temperature: -50°C to +100°C (-58°F to +212°F)

Humidity: 5-95% non-condensing

Vibration Resistance: 5g (10-2000Hz)

Protection Rating: IP20 (standard enclosure)

Communication & Configuration
Communication Protocols:

Modbus RTU (RS-485)

CANopen

Configuration Interface:

Woodward Toolkit™ software (Windows-based)

Front-panel display (optional)

Firmware Updates: Field-upgradable

Mechanical Specifications
Dimensions: 120 × 80 × 25mm (4.7 × 3.1 × 1.0in)

Weight: 0.45kg (1.0lb)

Mounting: DIN rail or panel mount

Connectors: Removable screw terminals

Certifications & Compliance
EMC: EN 61000-6-2/4

Safety: UL 508, CE Marked

Environmental: RoHS compliant

Marine: ABS, DNV, LR certified versions available

Typical Applications
Gas turbine speed control

Diesel engine governing

Power generation systems

Marine propulsion control

Compressor anti-surge systems