Digital guide
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Woodward 8237-951
Product Name: 721 Digital Control (Low Voltage)
Product Introduction: A low-voltage version of the 721 digital speed controller, designed for reciprocating engines in generator set or mechanical drive applications. Operates from 18–32 VDC power supply, integrating speed sensing, PID control, and actuator drive circuitry. Supports isochronous/droop control, load sharing, and overspeed protection.
Detailed content
Technical Specifications:
- Power Supply: 18–32 VDC (24 VDC nominal), 18 W
- Speed Signal Input: Magnetic pickup (MPU), 60–15,000 Hz (8–2100 RPM)
- Actuator Output: 0–20 mA or 0–200 mA (jumper selectable)
- Analog Inputs: 4 (4–20 mA or 0–5 VDC)
- Discrete Inputs: 8 (isolated, 24 VDC)
- Discrete Outputs: 3 (relay, 2 A at 28 VDC)
- Operating Temperature: -40 °C to +70 °C
- Protection Grade: IP30
Functional Features:
- Digital PID control with adjustable gain, stability, and droop
- Isochronous and droop speed control modes
- Built-in load sharing circuitry for parallel generator operation
- Overspeed protection with adjustable trip point
- Multiple analog and discrete I/O for system integration
- On-board programming via handheld programmer or PC software
- Rugged metal enclosure for industrial environments
Application Scenarios:
- Medium and large-bore diesel and gas generator sets
- Industrial engine-driven pumps and compressors
- Marine auxiliary engine speed control
- Oil and gas field prime mover control systems
- Remote field operation heavy-duty power equipment
