Description
Woodward 5501-381 | MicroNet TMR 220 Vac Power Supply Module
Product Introduction
In critical power generation and heavy industrial turbine installations, control system downtime is financially unviable. The Woodward 5501-381 is a specialized high-voltage AC power supply unit engineered specifically for Woodward’s advanced MicroNet TMR (Triple Modular Redundant) and 5009 digital control architectures. Unlike standard commercial power bricks, this module is built to manage heavy inductive loads and protect sensitive processor logic from grid fluctuations, noise spikes, and brownouts inherent in heavy plant environments.
Designed for slide-in integration directly into MicroNet TMR power supply chassis slots, the 5501-381 accepts a nominal 220 Vac input and supplies clean internal DC rails across the system backplane. It features a hot-swappable structural layout, allowing maintenance personnel to replace a failed supply unit during live plant operations without dropping system control or tripping the prime mover. Front-panel diagnostic LEDs provide instant visual confirmation of input health, thermal status, and overall converter performance.
5501-381
Key Technical Specifications
| Parameter | Specification Metric |
| Device Category | TMR Power Supply Control Module |
| System Compatibility | Woodward MicroNet TMR & 5009 Control Platforms |
| Nominal Input Voltage | 220 Vac (High-Voltage AC variant) |
| Frequency Range | 47 to 63 Hz |
| Maximum Input Power | 1250 VA |
| Maximum Input Current | 6.7 A |
| Protection Circuitry | Integrated 10 A time-delay input circuit breaker / fuse |
| Hot-Swap Capability | Supported for online replacement without rack shutdown |
| Diagnostic Indicators | Front-panel LEDs: Input Fault, Power Supply Fault, Overtemperature, and OK (Green) |
| Operating Temperature | Standard industrial panel range (0^\circC to +50^\circC) |
Application Scenarios & Pain Points
- Utility Gas & Steam Turbine Protection: Power generation facilities require continuous, uninterrupted monitoring of fuel valves and trip headers. The 5501-381 provides redundant, high-capacity power stability to prevent spurious turbine trips caused by voltage sags.
- Pipeline Compressor Station Controls: Natural gas compressor skids running remote operations depend on reliable power conversion modules that can tolerate harsh electrical environments and fluctuating auxiliary feeds.
- Continuous Process Plant Retrofits: Upgrading legacy TMR control cabinets requires direct drop-in power supplies that match backplane pin-outs and thermal footprints without requiring complete cabinet rewiring.
QA & Live Testing SOP (Trust Signal)
We don’t warehouse legacy high-voltage power supplies without verifying conversion efficiency and safety circuit integrity; every 5501-381 unit goes through our rigorous bench protocol:
- Visual & Component Audit: Inspected under optical magnification for capacitor integrity, transformer winding stability, power semiconductor seating, and absence of thermal stress or oxidation.
- Dynamic Rack Power-Up Test: Slotted into an authorized MicroNet TMR test chassis energized at 220 Vac to verify clean startup transitions, internal DC rail voltage regulation, and holdup time performance under load.
- Protection & Fault Indication Check: Evaluated for proper response to input line drops, testing the 10 A time-delay breaker threshold and confirming accurate status indicator LED sequencing (Input Fault, Overtemperature, and Green OK states).
- Protective Packaging: Sealed inside heavy-duty anti-static barrier packaging and suspended securely within high-density structural foam to prevent shipping shock.
Field Engineer’s Pitfall Guide
- ❗ Input Voltage Verification: The 5501-381 is specifically engineered for 220 Vac input; supplying an incorrect line voltage (such as 120 Vac) will result in a failure to boot or continuous input fault triggering.
- ❗ Internal Breaker Reset Protocol: If the unit trips due to an overcurrent event, inspect the front-panel or internal 10 A time-delay breaker; never bypass safety protection breakers with higher amperage fuses.
- ❗ Hot-Swap Safety Measures: While the unit supports hot-swapping, always use insulated tools and follow facility LOTO (Lockout/Tagout) safety standards when unseating high-voltage AC connection blocks from the chassis rear.
Intent-Driven FAQ
Is the Woodward 5501-381 interchangeable with 120 Vac MicroNet power supplies?
No. The 5501-381 is a designated high-voltage 220 Vac input module. Ensure your incoming cabinet supply matches this rating before installation.
What do the front-panel LEDs indicate on the 5501-381?
The front faceplate features four indicators: Input Fault, Power Supply Fault, Overtemperature, and a green OK LED which illuminates only when the power supply is running normally with no internal faults.
Can this power supply be replaced while the turbine control system is running?
Yes. The 5501-381 features a hot-swappable design intended for redundant TMR configurations, allowing replacement in a live chassis without stopping system operation.
What causes an Overtemperature fault on this power supply?
An overtemperature condition typically points to blocked cooling airflow in the control cabinet, a failed cabinet exhaust fan, or operating ambient temperatures exceeding structural limits.
What kind of warranty covers this surplus power module?
Every unit is backed by our comprehensive replacement guarantee, supported by multi-point pre-shipment bench testing to ensure absolute electrical stability out of the box.
