Woodward 9907-164 Digital Governor

PLC Autocontroller | 20 Years of Turbine & Generator Control Expertise
Data Sheet: Woodward 9907-164 – 505 Digital Governor for Steam Turbines

Product Identity
9907-164 is a 505-series microprocessor governor designed for steam turbines driving pumps, compressors or generators. It manages single or split-range servo valves, closes generator breakers and shares load without external PLC logic—all from a two-line, 24-character front panel .

Core Capabilities

• I/O mix: 16 contact inputs (4 fixed + 12 programmable) + 6 isolated 4-20 mA analog inputs
• Control loops: PID speed, PID/aux load, cascade pressure, extraction pressure (optional)
• Protection pack: critical-speed avoidance bands, valve position limiter, first-out trip log, overspeed test function
• Actuator drive: 0-200 mA PWM output; software-selectable for one or two servo stages
• Auto-start curve: warm-up ramps, hold points and speed/load targets editable on site
• Communications: RS-232 on RJ-45 (Modbus RTU default); Ethernet option card available
• Power: 24 VDC ±20 %, 10 W max; reverse-polarity protected
• Temp / humidity: –30 … +70 °C, 5-95 % RH non-condensing
• Certifications: CE, UKCA, ABS marine; suitable for Class 1 Div 2 / Zone 2 with correct enclosure

Typical Plant Wins
• Cogeneration skid: 6 MW back-pressure turbine ramps from cold to 3 k rpm in 9 min without operator action.
• Palm-oil mill: 9907-164 splits steam between process header and 1 MW generator; maintains header at 6 bar ±0.2 bar during load swings.
• University test bench: students run overspeed trip test at 3.6 k rpm; governor logs first-out channel and time stamp for lab report.

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