Description
Product Introduction
The Woodward 5437-687 is a specialized Discrete Field Terminal Module (FTM) engineered for the Woodward MicroNet, MicroNet Plus, and MicroNet TMR (Triple Modular Redundant) turbine control systems. It acts as the physical wiring bridge between cabinet field contact inputs (e.g., trip switches, permissive contacts, pressure switches) or digital outputs (solenoid drives, status relays) and the high-density MicroNet discrete VME processing modules.
By terminating multi-pair field wiring onto organized screw-clamp terminal blocks, the 5437-687 simplifies system commissioning, eliminates wiring clutter, and protects sensitive main controller backplane electronics from field electrical noise and voltage spikes.
Key Technical Specifications
| Parameter | Value |
| Manufacturer | Woodward Inc. |
| Part Number | 5437-687 |
| System Compatibility | MicroNet, MicroNet TMR, MicroNet Plus |
| Module Type | Discrete Input/Output Field Terminal Module (FTM) |
| Connection Type | High-Density D-Sub Cable Receptacle / Heavy-Duty Screw Terminals |
| Signal Handling | Discrete Digital Inputs (24 VDC / 125 VDC contact sensing) / Relay Outputs |
| Mounting | Standard 35mm DIN Rail Carrier |
| Operating Temperature | -40°C to +70°C |
| Relative Humidity | 5% to 95% non-condensing |
Application Scenarios & The “Trench” Experience
During a hot-cutover retrofitting project on a steam turbine generator set, commissioning technicians needed to land 32 digital trip Permissives and solenoid control channels into an upgraded MicroNet chassis. Wiring directly to low-profile VME connectors on live cards carries a high risk of bent pins or false trips. By utilizing pre-mounted Woodward 5437-687 discrete FTMs, the team landed and rung out all 24 VDC field dry contacts on the screw terminals prior to attaching the multi-conductor cable harness—enabling error-free point-to-point verification and zero unscheduled downtime.
- Gas & Steam Turbine Controls – Emergency shutdown (ESD) contact monitoring, generator breaker status inputs, and trip solenoid actuation.
- Compressor Stations – Lube oil pressure switch trip logic, valve position limits, and local operator panel permissives.
- Marine Engine Governors – Clutch engage/disengage status, overspeed safety contacts, and alarm beacon outputs.
5437-687
5437-687
Transparency SOP: Quality Assurance & Testing
Every Woodward 5437-687 FTM module undergoes a rigorous 5-step quality verification process prior to entering inventory:
- Inbound Physical Inspection: Inspection of the DIN rail mounting carrier, screw terminal threads, trace solder integrity, and high-density D-sub connector pins.
- Channel Continuity Sweeps: Point-to-point resistance checks across all discrete input/output channels to confirm zero open circuits or trace cracks.
- Dielectric Isolation Testing: High-pot and channel-to-ground isolation checks to guarantee no cross-talk or voltage leakage across contact channels.
- MicroNet Live Simulation: Cable-connected to a live MicroNet test rack to cycle digital input states and verify contact sensing response times under load.
- Anti-Static Packaging: Cleaned, fitted with protective connector caps, and sealed in ESD-safe shielding bags with fresh desiccant packs.
The Veteran’s Tech Trap Guide (Crucial Value-Add)
- ⚠️ Contact Wetted Power Polarity: When using external 24 VDC or 125 VDC wetting voltage for dry contact field switches, verify your power supply common wire layout on the 5437-687 terminal strip. Reversing wetting power polarity can cause discrete input optocouplers on the connected MicroNet card to fail to register contact closures.
- ❗ Cable Selection Matching: Ensure the high-density cable assembly matches the specific discrete I/O module in your chassis (e.g., 24 VDC Discrete I/O vs. High-Voltage Discrete I/O). Using an improper cable harness between the 5437-687 and the VME card can misalign channel numbering.
- ⚠️ Inductive Solenoid Suppression: When driving inductive field loads (such as heavy trip solenoids or relay coils) directly from outputs on the FTM, always ensure flyback diodes or surge suppressors are installed across the load. Unsuppressed inductive spikes can radiate back into the FTM terminal bus.
Frequently Asked Questions (FAQ)
Q: Can the Woodward 5437-687 FTM be used in redundant MicroNet TMR architectures?
A: Yes. Depending on the system wiring topology and cable harness used, the 5437-687 can serve as a field interface in Simplex setups or be paralleled across redundant channels in MicroNet TMR control systems.
Q: Does the 5437-687 board require an external power supply to operate?
A: The 5437-687 itself is a passive terminal/routing interface card. However, field contact wetting power (24 VDC or 125 VDC) is landed on designated power terminals on the board to power the field contact loops.
Q: How is the 5437-687 mounted inside an enclosure?
A: It features an integrated extruded PVC base with standard 35mm DIN-rail mounting clips for standard control cabinet installation.
Q: What warranty is included with this unit?
A: Every Woodward 5437-687 module includes a full 12-month operational replacement warranty.
Q: Are these genuine Woodward OEM parts?
A: Yes. All inventory consists of original Woodward OEM hardware sourced from verified factory surplus, plant decommissioning, or control upgrade projects.
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