Product Core Brief
- Model: 8402-319
- Brand: WOODWARD
- Series: 8402-Series Servo Drive / Actuator Control Module
- Core Function: Servo drive module used in Woodward turbine and engine control systems to precisely position actuators or servo valves based on controller commands.
- Product Type: Servo Drive / Actuator Control Module
- Key Specs: Servo position control | Actuator/servo valve interface | Industrial-grade reliability | Panel or rack-mount installation | Compatible with Woodward turbine/engine control platforms
- Condition: New Original / New Surplus
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 8402-319 |
| Manufacturer | WOODWARD, Inc. (Fort Collins, CO, USA) |
| Product Type | Servo drive / actuator control module |
| Primary Function | Converts controller commands into precise actuator or servo valve positioning |
| Control Mode | Servo position control with speed/direction regulation |
| Typical Applications | Steam turbine valve actuation, engine fuel rack positioning, industrial servo systems |
| Installation | Panel-mount or rack-mount (configuration-dependent) |
| Communication | Proprietary Woodward interface; may support standard industrial protocols depending on revision |
| Operating Temperature | Industrial-rated; verify per nameplate or datasheet |
| Environmental Rating | Designed for demanding industrial environments |
Note: Exact electrical ratings, I/O configuration, communication protocol, and firmware revision depend on the specific sub-variant. Always verify against the installed unit label or Woodward technical documentation.
Product Introduction (No Fluff)
The 8402-319 is a Woodward servo drive module used in industrial turbine and engine control systems. It receives position commands from a Woodward controller (such as a 505-series governor or MicroNet system) and drives the connected actuator or servo valve to achieve precise, repeatable positioning.
In a turbine or engine control loop, this module sits between the digital controller and the physical actuator — translating electronic setpoints into mechanical motion. It is commonly found in applications where steam inlet valves, fuel racks, or other proportional actuators must respond accurately to speed, load, or process control commands.
From a system-integration perspective, the 8402-319 is a field-proven component in installed-base Woodward systems. For maintenance teams, it serves as a drop-in replacement for failed or degraded servo drive modules in existing turbine and engine panels.
QA & Testing SOP (Dynamic & Transparent)
Servo drive modules can develop latent faults in power stages, feedback circuits, or communication interfaces. Here is how we verify them:
- Visual & anti-counterfeit inspection — Confirm part number 8402-319, revision label, serial number, and housing condition. Check for burnt components, corroded terminals, or damaged connectors.
- Connector and terminal inspection — Examine all electrical connectors and terminal blocks for oxidation, loose pins, or signs of arcing.
- Power-up test — Apply rated supply voltage per the unit nameplate. Confirm normal boot and absence of fault indicators.
- Communication verification — If the module interfaces via a proprietary or standard protocol, verify that it responds to controller handshakes and reports healthy status.
- Servo output simulation — Where test infrastructure allows, apply a position command and verify the drive output responds correctly in direction, range, and proportionality.
- Feedback circuit check — Verify that position feedback signals (if applicable) track correctly with commanded position.
- Packaging — ESD-bagged, connectors capped, foam-padded, and shipped in impact-resistant boxing.
Tools: Rated power supply, multimeter, servo test fixture, and compatible Woodward controller or simulator where applicable.
Installation Pitfalls & Guide (Engineer to Engineer)
❗ Confirm compatibility with your controller. The 8402-319 must match the communication protocol and I/O expectations of your existing Woodward controller (e.g., 505, MicroNet, or other platform). Mismatched firmware or revision can prevent proper operation.
❗ Verify actuator type and wiring. Servo drives are configured for specific actuator types and feedback arrangements. Incorrect wiring or mismatched actuator parameters can cause hunting, instability, or damage.
❗ Check power supply ratings. Servo drives draw significant current during operation. Ensure the power supply can handle peak demand, especially during actuator stroke testing.
❗ Calibrate position feedback after replacement. After installing a replacement module, the actuator position feedback must be recalibrated to ensure accurate positioning across the full stroke range.
❗ Do not skip supervised commissioning. After replacement, verify actuator response, feedback accuracy, and fail-safe behavior under controlled conditions before returning the system to full operation.
Replacement steps:
- Place the turbine or engine in a safe shutdown state. Isolate control power and document all wiring.
- Photograph terminal assignments and configuration settings.
- Remove the faulty module. Inspect connectors and wiring for corrosion or damage.
- Install the replacement. Restore power, verify communication, calibrate position feedback, and commission under supervised testing.
Technical FAQ
Can you offer price flexibility for bulk or repeat orders? Yes. Pricing depends on condition (new original vs. new surplus), revision, and quantity. We can discuss volume pricing for maintenance spares packages.
What warranty do you provide? Warranty terms vary by condition and source. New original units carry manufacturer-backed coverage where applicable; new surplus units carry our tested-unit warranty. Terms are confirmed before shipment.
Is this directly compatible with my existing Woodward system? In most cases, yes — the 8402-319 is a standard Woodward servo drive module. However, you must confirm the revision, firmware, and communication protocol match your installed controller and actuator configuration.
Can this replace other 8402-series modules? Potentially, but not automatically. Woodward 8402-series modules come in various configurations. You must match the I/O type, communication protocol, and actuator interface to your existing installation.
Is this model still available or obsolete? The 8402-series platform remains referenced in many installed-base Woodward systems. Individual module availability depends on revision and regional stock. For critical turbine or engine installations, keeping a tested spare on site is strongly
