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5432-271 - MicroNet Overspeed Test Reference Module is available in stock which ships the same day.
5432-271 - MicroNet Overspeed Test Reference Module comes in UNUSED as well as REBUILT condition.
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TECHNICAL SPECIFICATIONS:
Part Number: 5432-271
Manufacturer: Woodward
Chassis System Compatibility: MicroNet 7 | MicroNet Plus
Product Type: Overspeed Verification & Reference Test Card
Logic Interface: Dual-Channel Test Bus Injection Link
Operating Input Voltage: 5 VDC / 24 VDC Internal Rack Power
Signal Injection Resolution: 1 Hz Increments for Simulated Speed Sweeps
Key Interlock Input: Hardwired Physical Key-Switch Verification Terminal
Form Factor Configuration: Proprietary T-Slot Plugin Circuit Board Assembly
Repair Time: 3�5 Days
Availability: In Stock
Weight: 0.88 kg (1.94 lbs)
Country of Origin: United States
The Woodward 5432-271 is a purpose-built hardware injection module located strictly within the safety tier of the Woodward MicroNet chassis. Unlike the 5432-269 (which continuously reads field sensors), the 5432-271's sole function is to safely simulate overspeed conditions to test the main trip system without overspeeding the physical turbine. It bridges the gap between software test commands and hardwired system safety relays.
TEST CONTROL BUS INTERCONNECT
The card plugs directly into the chassis backplane, mapping onto a dedicated internal test control bus. When a technician initiates an overspeed test from the HMI or control panel, the 5432-271 isolates the active MPU speed tracking data lines from the main controller and replaces them with a highly accurate, ascending digital frequency ramp. This test pulse stream simulates an engine running past its critical RPM threshold to force a systemic check of the system's voting logic.
HARDWIRED PANEL KEY SWITCH INTERLOCK
To prevent accidental or unauthorised testing during active power generation, the 5432-271 is engineered with a front-facing, hardwired physical key-switch circuit connection. The module�s internal test logic gates remain physically grounded out and inert until a physical key is turned at the control panel. This completes the activation loop and ensures that automated software errors can never trigger a simulated trip test on a live grid.
WHY PARTNER WITH WORLD OF CONTROLS
World of Controls specialises in supplying and rebuilding hard-to-find legacy MicroNet cards. Every 5432-271 module is certified using comprehensive test routines that validate internal key-switch logic gating, test-bus injection frequencies, and backplane handshake protocols. We supply units in both UNUSED and REBUILT options to minimise client facility downtime.
What is the Woodward 5432-271?
The 5432-271 is a dedicated overspeed reference control unit that maintains and validates baseline trip thresholds for rotating machinery. It converts velocity configurations into rock-solid hardware reference points to monitor machine acceleration. If live operating metrics cross this predefined boundary, the board commands emergency safety shutdowns.
What is the exact function of the Woodward 5432-271 within the rack?
The 5432-271 is a dedicated overspeed verification card used to run electronic simulated trip tests on the MicroNet system. It does not monitor active field sensors; instead, it injects fake speed signals into the chassis logic to confirm that the overspeed protection loops respond correctly before a turbine goes live.
Why does the 5432-271 require an external physical key-switch connection?
The hardwired key switch acts as a physical safety interlock that prevents accidental activation of the test simulation loop during normal machine operation. Without turning this key to complete the hardware circuit, all test command outputs from the card remain grounded out and completely locked.
Does this card remain active after the overspeed verification test is completed?
No, as soon as the test sequence ends or the physical key-switch is turned back to run mode, the 5432-271 instantly terminates its simulation loop. Control of the speed tracking logic is immediately handed back to the primary MPU sensor inputs for normal turbine governing.
What diagnostic step indicates an internal failure on the 5432-271 board?
The card features a front-panel fault LED linked to internal watchdog circuitry that monitors the status of the injection bus. If an internal component failure occurs or the board fails its power-on self-test, the fault light illuminates, and a system alarm blocks all test procedures.
