Description
Woodward 8405-315
Technical Specifications
- Control Type: Digital microprocessor-based speed/load control.
- Input Signals: Accepts magnetic pickup (MPU) speed signals and 4-20 mA analog feedback.
- Output Signals: Provides 4-20 mA or 0-10V control signals to electro-hydraulic converters.
- Power Supply: Requires a regulated 24 VDC or 125 VDC power source depending on system configuration.
- Communication: Features RS-485 or Modbus RTU interfaces for SCADA integration.
Functional Features
- PID Control: Executes advanced Proportional-Integral-Derivative algorithms for bumpless speed transitions.
- Programmable Ramps: Allows customizable acceleration and deceleration rates to prevent mechanical stress.
- Self-Diagnostics: Continuously monitors internal circuits and field wiring for open or short-circuit conditions.
- Data Logging: Retains historical trip and alarm data in non-volatile memory for post-event analysis.
Application Scenarios
Primarily deployed in industrial gas turbines, steam turbines, and large reciprocating engine-generator sets requiring precise speed regulation and load sharing.
Performance Parameters
- Speed Droop Accuracy: Adjustable from 0% to 5% with a resolution of 0.01%.
- Response Time: System update rates exceeding 50 Hz for rapid transient recovery.
- Operating Temperature: Rated for continuous operation from -40°C to +85°C.
Material Composition
Housed in a ruggedized, die-cast aluminum enclosure with gold-plated connector pins to ensure superior corrosion resistance and electrical conductivity. Internal PCBs feature multi-layer conformal coating.
Structural Characteristics
- Form Factor: Compact single-width module designed for DIN rail or panel mounting.
- Connectors: Utilizes high-density, keyed circular or rectangular multi-pin connectors to prevent miswiring.
- Indicators: Front panel includes bi-color LEDs for Power, Run, Fault, and Actuator Status.
Working Principle
The module continuously calculates the error between the actual speed (derived from MPU pulses) and the desired setpoint. The microprocessor applies PID compensation to this error and outputs a proportional analog signal to the electro-hydraulic actuator, adjusting fuel or steam flow to maintain the target speed.
Installation Requirements
- Must be mounted in a NEMA 4 or IP65 rated enclosure if exposed to harsh environments.
- MPU cables must be routed separately from high-voltage power cables to prevent electromagnetic interference.
- Requires a dedicated, clean earth ground connection.
Usage Precautions
- Never disconnect the MPU sensor while the engine is running to prevent overspeed conditions.
- Ensure all parameter changes are saved to non-volatile memory before powering down.
- Perform a functional load test after any firmware updates or parameter modifications.
