Description
Product Introduction & Engineering Value
The Woodward 5501-432 is a two-channel actuator controller designed for applications requiring independent control of integrating or proportional hydromechanical or pneumatic actuators. Its 200 mA driver version supports actuator control while accepting one or two position-feedback devices on each channel.
For a replacement, the important checks are actuator current requirement, feedback-device arrangement, controller architecture, and the associated field cable/FTM. Woodward documentation places the 5501-432 within MicroNet control-system configurations rather than treating it as a general-purpose PLC output module.
Technical Specifications
| Specification | 5501-432 |
|---|---|
| Manufacturer | Woodward |
| Part Number | 5501-432 |
| Product Type | Actuator Controller Module |
| Channels | 2 |
| Driver Version | 200 mA |
| Maximum Driver Current | 245 mA |
| Feedback Devices | 1 or 2 per channel |
| Actuator Type | Integrating or proportional |
| Actuator Technology | Hydromechanical or pneumatic |
| Power Requirement | +5 VDC @ 0.5 A; +24 VDC @ 1 A |
| Position Accuracy | 0.25% of full scale at 25°C, excluding transducer error |
| Output Current Tolerance | ±1% of full scale |
| Current Readback Tolerance | ±5% of full scale |
| Associated FTM | 5437-672 |
| Associated Cable | 5417-041 / 12 ft |
| Dimensions | Approximately 10.25 × 9.75 × 1 in. |
The 200 mA/245 mA driver ratings, dual-channel architecture, feedback capability, power requirements, accuracy, and dimensional information are reported in technical listings for the 5501-432. Woodward’s own documentation confirms the two-channel actuator-controller role and the associated 5437-672 FTM/5417-041 cable arrangement.
5501-432
5501-432
Field Application & The “Trench” Experience
A typical turbine shutdown can expose a deceptively simple actuator problem: the control system remains online, but one valve position refuses to track its command. Before replacing the 5501-432, a technician would normally check the actuator, feedback transducer, wiring, field termination, and controller diagnostics.
If the module is confirmed faulty, the replacement needs to be matched to the 200 mA driver requirement and existing two-channel architecture. After installation, each actuator channel should be checked independently, including feedback direction, commanded position, actual position, and fault indication.
Specific application scenarios include:
- Steam turbine control-valve positioning — closed-loop actuator control where valve position feedback is required.
- Hydromechanical governor actuator control — proportional or integrating actuator applications within compatible MicroNet systems.
- Turbine fuel or steam admission control — independent actuator channels can support separate control elements where the system configuration calls for them.
Transparency SOP: QA & Testing
A useful QA process for a 5501-432 should include more than a visual inspection:
- Part-number confirmation — verify the exact 5501-432 identification.
- Driver verification — confirm the 200 mA version and inspect the output circuitry.
- Feedback testing — verify the applicable feedback interfaces with a compatible test setup.
- Watchdog check — confirm the module’s hardware monitoring behavior where test equipment permits.
- Output test — exercise both actuator channels under controlled conditions.
- Documentation — record serial number, physical condition, test results, and warranty status.
The module incorporates watchdog hardware that monitors logic power and microcontroller activity. Loss of communication with the CPU is also associated with output shutdown behavior, according to available technical documentation.
The Veteran’s Tech Trap Guide
⚠️ Trap #1 — Confusing driver-current versions.
The MicroNet actuator-controller family includes different current versions, including 10 mA, 25 mA, 50 mA, 100 mA, and 200 mA variants. The 5501-432 is the 200 mA version. Do not substitute another suffix simply because it has the same two-channel architecture.
⚠️ Trap #2 — Ignoring the feedback circuit.
Each channel can use one or two position-feedback devices. A replacement checkout should therefore include the feedback signal, not merely the actuator output.
PRO TIP: Record the existing actuator current requirement before ordering. The part number is only half of the compatibility check; the actuator and feedback arrangement must also match.
⚠️ Trap #3 — Using the wrong field cable.
Supplier documentation identifies the 5417-041 cable and 5437-672 FTM with applicable 5501-432 configurations. Do not assume that a generic MicroNet cable is interchangeable.
Dynamic FAQ
What is Woodward 5501-432?
The 5501-432 is a Woodward 2-channel Actuator Controller Module designed for independent control of two actuator channels. It is rated as the 200 mA version of the MicroNet actuator-controller family.
What type of actuators can it control?
It is designed for integrating or proportional hydromechanical or pneumatic actuators.
How many feedback devices can each channel use?
Each actuator channel can support one or two position-feedback devices, depending on the system configuration. LVDT and RVDT feedback devices are identified in available technical documentation.
What is the output-current rating?
The 5501-432 is the 200 mA driver version, with technical listings specifying approximately 245 mA maximum. The actuator’s actual electrical requirements should be checked before substitution.
Is 5501-432 available as New Surplus?
Yes. Current supplier listings show Never Used Surplus, New Surplus Factory Package, and refurbished/used units, depending on the supplier. The actual condition should be confirmed for the specific unit being quoted.
What warranty should I expect?
Warranty depends on the supplier and inventory condition. Current listings show examples ranging from one-year to three-year supplier warranties. These are seller warranties, not automatically Woodward factory warranties, so the applicable terms should be confirmed on the quotation.
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