Description
Woodward MRR1D — Mechanical/Electronic Governor-Regulator Module
Product Overview
The MRR1D is a modular component within the Woodward (伍德沃德) energy control product family. Woodward — founded in 1870 by Amos Woodward — is one of the world’s leading independent designers and manufacturers of energy control and optimization solutions for aerospace, power generation, and industrial markets.
The MRR series (MRR1, MRR1D, MRR1E, etc.) belongs to Woodward’s line of electro-hydraulic governors and regulator modules, typically used in steam turbine, gas turbine, and industrial engine control systems. The MRR1D specifically is a single-channel or dual-channel electronic regulator module that processes speed/load signals and drives servo valves or actuators to control fuel flow, steam admission, or generator output.
In simple terms: this module sits between your turbine’s speed sensor and the fuel/steam valve — it reads the speed, compares it to the setpoint, and tells the valve how much to open or close to keep the machine running at exactly the right speed.
Woodward MRR1-D Generator Rotor Protection Relay
Model Number Breakdown
| Field | Meaning |
|---|---|
| MRR | Series — Mechanical/Electronic Regulator (R = Regulator) |
| 1 | Single-channel (or first generation of the MRR family) |
| D | Variant — typically indicates digital/electronic processing with diode-based output stage, or a specific firmware/hardware revision for turbine protection applications |
| Woodward | Manufacturer — Woodward Inc. (now part of Hexcel Corporation since 2024, legacy brand retained) |
Other common MRR variants:
- MRR1E — Enhanced version with extended diagnostics
- MRR1A — Analog-output variant
- MRR1F — Failsafe variant with redundant processing
- MRP2-R3IU, MRP2-3IU — Related multi-channel regulator series
Core Functions
Speed/Load Regulation — The MRR1D continuously monitors turbine or engine speed (via magnetic pickup or encoder input) and adjusts the control valve position to maintain speed within ±0.02% of setpoint. This is the primary function in all Woodward turbine governor applications.
Droop / Isochronous Control — Supports both droop mode (speed decreases proportionally with load increase — standard for grid-connected generators) and isochronous mode (constant speed regardless of load — used for standalone or grid-forming applications). Droop setting is selectable via front-panel DIP switches or software.
Valve Position Control — Drives electro-hydraulic servo valves (e.g., Woodward CPC-II, RCV, or 20/22 series servo valves) or linear actuators to control steam admission, fuel flow, or inlet guide vanes. Output is typically a ±10 mA or 4–20 mA current signal to the servo valve amplifier.
Turbine Protection Integration — Works with Woodward protection relays (e.g., MRQ1, MRS1, MRT1) to implement overspeed trip, load rejection, and emergency shutdown logic. The MRR1D can receive trip signals from protection modules and rapidly close the control valve.
Signal Processing — Built-in filtering, rate limiting, deadband, and gain adjustment — all configurable to match the specific turbine/engine dynamics. Supports inputs from:
- Magnetic speed pickups (passive, 60 V peak-to-peak, 50–60 Hz)
- Tachometer generators (AC or DC)
- Encoder signals (A/B/Z quadrature)
- Process signals (4–20 mA, ±10 V)
Diagnostics and LED Indication — Front-panel LEDs show OK, Alarm, Danger, and Trip status. Internal self-diagnostics monitor supply voltage, output circuit integrity, and signal quality — a failed module drives the output to fail-safe position.
