Product Short Description
Product Name
505 Series Digital Governor / Turbine Control Module
Product Introduction
The Woodward 9907-1183 is a member of the Woodward 505 series digital steam turbine control family. It integrates speed control, load regulation, synchronous detection, and overspeed protection in a single microprocessor-based controller. Depending on configuration, it can be deployed as a complete turbine governor or as a digital input/expansion module within a 505 control system.
Description
Technical Specifications
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Processor: 32-bit microcontroller
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Supply Voltage: 24 V DC (18–32 V range)
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Display: Integrated Operator Control Panel (OCP), 2-line text (24 characters per line)
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Digital Inputs: 16 contact inputs
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Analog Inputs: 6 current inputs (4–20 mA)
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Analog Outputs: 0–10 V DC (actuator drive)
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Communications: RS-232, Ethernet, Modbus
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Protection: IP56 (with appropriate enclosure) / NEMA 4X
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Expansion: Supports LinkNet HT distributed I/O modules
Functional Features
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Multiple control modes: speed control, load control, synchronous (isochronous) control.
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Automatic PID parameter calculation and valve ratio setting for simplified commissioning.
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Ratio limiter function decouples speed and extraction pressure for single-extraction or single-admission turbines.
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Integrated OCP for local parameter setting and status monitoring.
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Standard RS-232 and Ethernet interfaces with Modbus protocol for DCS/PLC integration.
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LinkNet HT distributed I/O expansion for flexible channel count.
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Comprehensive fault diagnostics and protection (including overspeed trip).
Application Scenarios
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Fossil Power Plants: Steam turbine generator speed control and load dispatch.
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Industrial Waste Heat Recovery: Turbine control under fluctuating steam conditions.
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Oil & Gas: Compressor-drive turbine control with extraction pressure regulation.
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Turbo-expander Energy Recovery: Rapid speed regulation for surge prevention.
Working Principle
The controller samples speed via MPU and process variables via analog inputs. The 32-bit processor runs control algorithms to produce 0–10 V DC actuator drive signals. For extraction turbines, the ratio limiter independently regulates speed and extraction pressure. Communications allow DCS integration for supervisory control and data acquisition.
Installation Requirements
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Install inside a control cabinet providing IP56 / NEMA 4X protection.
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Provide 24 V DC power (18–32 V) with correct polarity.
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Connect speed probe(s), pressure transmitters, and other analog sensors.
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Wire actuator output to turbine control valve or servo.
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Establish Ethernet or RS-232/485 link to DCS/PLC.
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Use ESD grounding during installation.
Usage Precautions
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Verify supply voltage is within 18–32 V DC before power-up.
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Confirm signal types match terminal assignments (4–20 mA or 0–10 V).
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Do not expose to moisture beyond IP56-rated enclosure.
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Periodically review fault history and real-time trends via OCP.
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Observe all lockout/tagout procedures during maintenance.
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Keep firmware and configuration backups for rapid recovery.
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