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Woodward 9907-302
Product Name: 2301A Load Sharing and Speed Control Governor (Low-Voltage Version)
Overview: A 2301A series analog electronic speed governor, belonging to the 9905 series low-voltage variant controllers. Specially designed for prime mover speed control and multi-unit parallel load sharing. It receives magnetic pickup (MPU) speed sensor signals and outputs 0–200 mA drive signal to control electro-hydraulic actuators, achieving closed-loop speed regulation for steam turbines, gas engines, and diesel engines. Supports single-unit operation and multi-unit parallel load equalization.
Detailed content
Specifications:
- Power Supply: 20–40 VDC low-voltage DC
- Speed Input: Magnetic pickup MPU speed sensor, 50–3000 Hz input frequency range
- Actuator Drive Output: 0–200 mA current output
- Analog Input: 4–20 mA external speed/load setpoint signal
- Operating Temperature: –25 °C to 70 °C
- Protection Rating: IP20, panel-mount cabinet installation
- Speed Control Accuracy: ±0.25% FS
- Load Share Balance Error: ≤3%
- Speed Adjustment Response Time: Adjustable 50–5000 ms
Features: Closed-loop speed PID regulation with configurable proportional, integral, and derivative parameters for different prime movers; supports parallel operation of multiple units for automatic load equalization; critical speed avoidance function automatically skipping resonance speed ranges; soft acceleration and deceleration ramp functions for smooth unit start/stop; fault status output alarm contacts for external alarm systems; supports external 4–20 mA signal for remote speed/load setting.
Applications: Single and grid-connected speed regulation for turbo-generator sets; parallel control of diesel and gas generator sets; speed regulation for industrial drive steam turbines; speed control systems for compressor drive prime movers.
Materials: Aluminum alloy metal enclosure; industrial-grade FR-4 PCB with full industrial wide-temperature specification components; copper alloy gold-plated anti-vibration oxidation terminals.
Structure: Standard enclosure panel-mount structure with status indicator lights on the front; adjustment potentiometers on the side; large terminal block at the bottom concentrating speed sensor, power, actuator output, and analog signal connections; mounting ears on both sides of the enclosure for direct fixing to DIN rail inside the control cabinet.
Working Principle: The MPU speed sensor signal is fed into the PID regulation loop. The controller compares the actual speed against the setpoint and outputs 0–200 mA to the electro-hydraulic actuator, adjusting fuel or steam to maintain target speed. In multi-unit parallel operation, the load sharing circuit balances output among units. Critical speed avoidance automatically skips resonant ranges during acceleration/deceleration ramps.
Installation & Precautions: Mount in a control cabinet with IP20-rated environment. Properly connect the MPU sensor with correct polarity and shielding. Ensure the power supply is within 20–40 VDC. Calibrate speed trim and droop settings per application requirements. Use shielded cable for analog signals, separating strong and weak current wiring.
