Description
Woodward 5501-381 | MicroNet TMR Power Supply | 220 VAC Input
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Woodward |
| Part Number | 5501-381 |
| Product Family | MicroNet TMR |
| System Application | 5009 / MicroNet TMR |
| Module Type | Main chassis power supply |
| Input Voltage | 220 VAC |
| Input Frequency | 47–63 Hz |
| Maximum Input Power | 1250 VA |
| Maximum Input Current | 6.7 A |
| Hold-Up Time | Approximately 1 cycle at 220 VAC |
| Power Supply Architecture | TMR |
| Related Manual | Woodward 26167 series |
The 220 VAC input identification and MicroNet TMR application are confirmed by Woodward’s own module tables. Secondary technical references report 47–63 Hz, 1250 VA maximum input power, 6.7 A maximum input current, and one-cycle hold-up at 220 VAC.
Product Introduction
The Woodward 5501-381 is a MicroNet TMR power-supply board used in 5009 and MicroNet turbine control systems. It is the 220 VAC version of the main chassis power-supply hardware and is part of the power architecture supporting the control system’s electronic modules. Woodward’s 5009FT documentation also lists 5501-381 as a recommended spare for the main chassis power supply when the installation uses a 220 VAC input.
For maintenance teams, the distinction between 5501-381 and 5501-380 matters: they are associated with different incoming power configurations. Substituting one based only on physical appearance is not appropriate.
Application Scenarios & Field Pitfalls — The Engineer’s Perspective
Engineering Pain Point
A MicroNet power-supply fault can look like a controller, I/O, or communication problem because loss or instability of chassis power can affect several downstream modules at once. Before replacing a CPU or I/O card, technicians should confirm the power-supply status, incoming AC supply, chassis arrangement, and the individual TMR supply paths.
5501-381
Typical Applications
- Woodward 5009 turbine control systems
- MicroNet TMR turbine control panels
- Steam turbine control installations
- Legacy turbine control systems requiring an original 220 VAC power-supply spare
Technical Pitfalls
1. Verify the incoming AC voltage.
5501-381 is the 220 VAC version. Woodward separately identifies 5501-380 for 120 VAC/DC input. Do not treat the two part numbers as interchangeable.
2. Confirm the chassis architecture.
This is a MicroNet TMR power-supply component, not the newer MicroNet Plus 220 VAC supply. Woodward lists 5466-1002 for the MicroNet Plus 220 VAC architecture, which belongs to a different hardware generation.
3. Check the complete part number before procurement.
For legacy Woodward hardware, matching only the family name can produce the wrong power-supply variant. Confirm the installed board marking, chassis type, input-power arrangement, and hardware revision.
4. Do not confuse the board with the complete power-supply chassis.
Woodward documentation distinguishes the 5501-381 power-supply board from the MicroNet TMR power-supply chassis and related interconnect hardware.
5. Treat used units as maintenance-critical hardware.
For a power-supply board, visual inspection alone is not enough. Check connector condition, signs of thermal stress, capacitor condition, fuse/protection components, and output behavior under an appropriate test setup before installation.
6. Verify replacement generation before changing architecture.
The MicroNet TMR documentation also lists 5466-1049 as the MicroNet TMR kernel power supply used with CPU5200 systems. It should not be assumed to replace the 5501-381 simply because both are power-supply products.
Related Products
- Woodward 5501-380 — MicroNet TMR power supply for 120 VAC/DC input; the closest electrical-input counterpart to 5501-381.
- Woodward 5501-370 — MicroNet TMR power supply for 24 VDC input.
- Woodward 5466-1002 — MicroNet Plus power supply for 220 VAC input; different hardware generation.
- Woodward 5466-1001 — MicroNet Plus power supply for 110 VAC/125 VDC input.
- Woodward 5466-1000 — MicroNet Plus power supply for 24 VDC input.
- Woodward 5466-1049 — MicroNet TMR kernel power supply intended for CPU5200 systems.
- Woodward 5453-277 — MicroNet TMR power-supply chassis associated with the main control chassis architecture.
- Woodward 5466-1047 — CPU5200-based MicroNet controller module, functionally separate from the power supply.
Procurement Note
For a 5501-381 replacement, the most useful information to provide with an RFQ is the complete 5501-381 marking, hardware revision, MicroNet/5009 system version, chassis part number, and incoming AC voltage. If the existing installation is being migrated rather than repaired like-for-like, verify the complete power architecture before selecting a newer MicroNet Plus component.
