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Woodward 9902-339

Product Name:​ 505 Series Digital Turbine Controller
Product Introduction:​ The 9902-339 is a 505 series microprocessor-based digital turbine controller. Its internal application software is field-programmable, guiding engineers through menu-driven software for programming configuration in power generation or mechanical drive applications.
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Technical Specifications:
  • Supply voltage: +24 VDC (approximately 1 A)
  • Display: Two-line × 24-character LED display with multi-function keypad
  • Communication: RS-232, RS-422, RS-485 (Modbus protocol support)
  • Analog inputs: 6 programmable current inputs (4–20 mA)
  • Discrete inputs: 16 contact inputs
  • Actuator outputs: 2
  • Relay outputs: 8
  • Analog outputs: 6 programmable current outputs
  • Operating temperature: –20 to +60 °C
  • Storage temperature: –40 to +85 °C
  • Humidity: 20%–95% (non-condensing)
  • Protection rating: IP56 (NEMA 4X)
  • Dimensions: Approximately 356 × 279 × 102 mm
  • Weight: Approximately 4.13 kg (9.11 lbs)
  • Certifications: CE, UL, RoHS
Functional Features:​ Precise speed control; triple independent overspeed protection logic with overspeed test button; load sharing and synchronization for multi-unit paralleling; self-diagnostic capability; local/remote switching; critical speed avoidance; data logging and event logging.
Application Scenarios:​ Industrial steam turbine speed and power control; small-grid turbine generator control; turboexpander control; gas turbine generator set control; compressor and pump mechanical drive turbines.
Structural Characteristics:​ Single printed circuit board encapsulated in a metal enclosure; front panel with LED display and keypad; rear with multi-terminal wiring block and 9-pin serial port; modular I/O design for easy expansion.
Working Principle:​ A magnetic reluctance speed sensor (MPU) detects actual turbine speed. The controller’s internal PID algorithm compares the actual speed with the setpoint and outputs an actuator drive signal to control steam valve or fuel valve opening, forming a closed-loop speed control. During grid-connected operation, power output is regulated according to load-sharing logic.
Installation Requirements:
  • Install in a compliant control cabinet rack with adequate ventilation
  • Follow wiring diagrams strictly; clearly distinguish power and I/O terminals
  • Pay attention to shielding and termination resistor matching for communication ports
  • Use 505View or OpView software for parameter configuration after installation
Usage Precautions:
  • Strictly prohibit hot-swapping modules or cables while powered
  • Read the complete manual and all safety publications before operation
  • Ensure the turbine is equipped with a mechanical overspeed trip device independent of the control system
  • Regularly inspect terminal tightness and cooling fan status
  • Never open the secondary circuit of a current transformer (CT); verify phase sequence for PT wiring

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