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Product Overview
The 8200-176 EM Digital Driver from Woodward is a dedicated actuator-drive and signal-conditioning module engineered for high-reliability turbine and rotating-equipment control systems.
This unit operates as the power and control interface between low-level speed or command signals and high-force turbine actuators, enabling accurate and repeatable regulation under dynamic load conditions.
Designed for integration with Woodward digital turbine controllers such as the 505 and 505E, the module provides deterministic control performance in environments characterized by electrical noise, vibration, and thermal stress.
Functional Role and Control Capabilities
The 8200-176 performs real-time processing of analog speed or demand signals and converts them into stable drive outputs for servo valves or electric actuators. Its internal control logic compensates for actuator inertia, mechanical friction, and load variation, ensuring smooth response during start-up, load changes, and steady-state operation.
Primary functions include speed loop support, actuator power drive, signal isolation, and noise suppression. The module is commonly deployed in closed-loop turbine governor architectures where control accuracy and operational stability are critical.
Electrical Characteristics
The 8200-176 is powered from a regulated DC supply and optimized for continuous industrial duty.
Nominal input voltage range: 18 to 32 VDC
Current consumption: approximately 3.3 A continuous
Input signal compatibility: 4–20 mA analog control or speed reference signals
Output type: actuator drive signals suitable for servo valves or electric positioning systems
Electrical isolation: galvanic separation between control inputs and power output stages to improve EMI immunity
Environmental and Mechanical Specifications
The hardware is housed in a rigid aluminum enclosure designed for long-term installation in turbine control cabinets.
Operating temperature range: –20 °C to +68 °C
Storage temperature range: –40 °C to +85 °C
Enclosure material: industrial-grade aluminum
The module is suitable for high-vibration and high-electromagnetic-interference locations, including power generation and offshore installations.
System Compatibility
The 8200-176 is typically installed as part of a Woodward digital governor system and operates in conjunction with supervisory controllers that handle sequencing, protection, and higher-level logic. It is commonly paired with 505-series turbine controllers but may also be used in custom speed-control architectures requiring a robust actuator driver.
Typical Applications
Steam turbine speed and load control
Gas turbine governor systems
Gas metering and flow-control skids
Compressors, expanders, and turbo-machinery
Industrial generator drive systems
Marine propulsion and auxiliary turbine systems
Industries served include power generation, oil and gas, petrochemical processing, marine engineering, and heavy industrial utilities.
Frequently Asked Questions
Is the 8200-176 a standalone governor controller?
No. The 8200-176 functions as an actuator driver and signal interface. It relies on an external digital governor or turbine controller for speed logic and supervisory control.
What type of actuators can it drive?
The module supports servo valves and electric actuators commonly used in turbine and flow-control applications, provided they fall within the electrical output specifications.
Can it operate continuously in high-temperature environments?
Yes. The operating temperature range is suitable for most turbine control rooms and enclosed industrial cabinets when proper ventilation is provided.
