Description
Product Introduction
The Woodward 5501-376 is a precision electronic speed control module built for prime movers, including industrial gas turbines, steam turbines, and heavy diesel or dual-fuel engines. Engineered to interface directly with magnetic pickups (MPUs) and fluid actuators, it delivers accurate closed-loop speed regulation across varying load profiles.
Unlike general-purpose PLC speed-sensing cards that rely on slow digital scan cycles, the 5501-376 uses dedicated hardware-based frequency-to-voltage processing. This provides near-instantaneous load-rejection response, keeping your prime mover within tight transient speed limits to prevent overspeed trips or frequency sagging on critical power buses.
Key Technical Specifications
| Parameter | Specification |
| Operating Voltage | 24 VDC nominal (18 to 32 VDC range) |
| Speed Sensor Input | Magnetic Pickup (MPU) input, 0.5 to 30 Vrms |
| Frequency Range | 1,000 Hz to 10,000 Hz full scale |
| Actuator Output | 0 to 200 mA current loop (compatible with EG, UG, and ProAct actuators) |
| Speed Trim / Bias Inputs | \pm 5 VDC or 4–20 mA remote speed setting |
| Steady-State Speed Band | \pm 0.25\% over full operating temperature range |
| Operating Temperature | -40°C to +70°C |
| Mounting Style | Internal chassis frame / DIN cabinet rail installation |
Application Scenarios & The “Trench” Experience
When an islanded microgrid loses a 500 kW motor load, an improperly tuned or failing governor board will let engine speed overshoot, tripping the main overspeed mechanical bolt. We saw a standby generator site where a degraded speed controller allowed frequency to hunt by \pm 2 Hz, throwing UPS units into bypass mode during routine load tests. Swapping in a fresh, bench-calibrated 5501-376 locked the engine at a dead-steady 1,800 RPM, smoothing out the governor current loop completely.
- Emergency Diesel Genset Governors – Providing fast, droop or isochronous speed response for critical backup power systems.
- Mechanical Drive Steam Turbines – Controlling steam admission valves on boiler feed pumps where process pressure changes demand rapid speed adjustments.
- Compressor Drive Gas Engines – Managing fuel gas metering valves under fluctuating suction pressures in natural gas booster stations.
5501-376
5501-376
Transparency SOP: Quality Assurance & Testing
We don’t just ship boxes; we test them on actual Woodward test benches. Every 5501-376 module passes our strict 5-step bench verification workflow before leaving our warehouse:
- Inbound Visual Inspection: Audit of terminal blocks, chassis solder joints, and protective conformal coating to verify zero heat stress or component corrosion.
- Power-On & Rail Check: Module powered on a 24VDC bench supply to verify onboard voltage regulators and status LED states.
- MPU Signal Injection: We feed high-frequency sine waves from a signal generator into the MPU inputs to test signal conditioning, frequency tracking, and speed-range stability.
- Actuator Output Loop Drive: Connect a live inductive load mimicking a Woodward actuator to ensure the output current sweeps smoothly from 0 to 200 mA without signal ripple.
- Clear & ESD Safe Packaging: Potentiometers/jumpers reset to baseline, board cleaned, and sealed in anti-static shielding bags.
The Veteran’s Tech Trap Guide (Crucial Value-Add)
- ⚠️ Set Potentiometers Before Start-Up: Do not assume a replacement 5501-376 comes pre-tuned for your engine! Take careful note of the Gain, Stability, and Droop pot settings on your original board. Adjust the replacement pots to match before cranking the prime mover, or you risk severe engine hunting on startup.
- ❗ Watch Out for Shielded MPU Wiring: Always ground the magnetic pickup cable shield at one end only (at the control panel end). If you ground both ends, ground loops will inject electrical noise into the speed input channel, causing erratic actuator output jitters.
- ⚠️ Verify Actuator Current Compatibility: Ensure your specific actuator coils match the current drive rating of the 5501-376. Running an incorrectly matched low-impedance coil can overheat the board’s output transistors and cause premature driver failure.
Frequently Asked Questions (FAQ for Conversion)
Q: Is the Woodward 5501-376 hot-swappable?
A: No. Removing or wiring this board while powered can arc terminal connections and short out the actuator drive stage. Always isolate the 24VDC supply before servicing.
Q: Can I use this module for both Isochronous and Droop speed control?
A: Yes, the 5501-376 can be configured for either single-engine Isochronous operation (constant speed) or Droop mode for paralleling generators onto a shared bus.
Q: What is the lead time for this surplus 5501-376 module?
A: All items listed in stock ship same-day or next-day, bypassing the typical 12 to 16-week factory build times.
Q: What condition are these 5501-376 units in?
A: We offer factory-sealed New Surplus units as well as fully reconditioned, bench-tested surplus modules. Every unit is 100% electrically validated before dispatch.
Q: What warranty is provided with this board?
A: Every Woodward 5501-376 module comes with a full 12-month operational replacement warranty from the date of purchase.
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