9905-068 Woodward Overspeed Protection Module

9905-068 Woodward Overspeed Protection Module | New & Original Stock

Availability: 99 left in stock

Woodward 9905-068 ProTech-GII Overspeed Protection Module The Woodward 9905-068, also cataloged as the 9905-068 TMR Module, operates as a dedicated...

SKU: 9905-068

Manufacturer: Woodward
Product No.: 9905-068
Product Type: Overspeed Protection Modules
Product Origin: USA
Payment:T/T, Western Union
Weight: 3200g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Woodward 9905-068 ProTech-GII Overspeed Protection Module

The Woodward 9905-068, also cataloged as the 9905-068 TMR Module, operates as a dedicated hardware component for absolute overspeed protection within ProTech-GII Overspeed Protection platforms.

Hardware Specifications

Parameter	Specification
Model	9905-068 (Revision N)
Brand	Woodward
Origin	United States
Weight	3.2 kg
Dimensions	28.5 cm x 11.4 cm x 24.8 cm
Operating Temp	-20 to +60 deg C
Power Consumption	Nominal 24 VDC (Accepts 18-32 VDC redundant supply inputs)
Control Architecture	Triple Modular Redundant (TMR)
Trip Execution Logic	Energize-to-Trip (ETT) configuration
Voting Logic	Hardware-based 2-out-of-3 (2oo3) execution
Response Time	< 12 ms total hardware trip execution path
Speed Inputs	3 independent channels (Supports passive MPU, active, or Hall-effect sensors)
Relay Outputs	Redundant Form-A and Form-C safety relays
Serial/Network Interfaces	Modbus RTU (RS-485) and Modbus TCP (Ethernet) ports
Diagnostic Interlocking	Continuous microcode health monitoring and real-time event logging

Industrial Drive & Governor Feedback Logic

The Woodward 9905-068 implements precise actuator loop feedback response parameters to maintain exact governor tracking across changing load gradients. The internal processing network utilizes specialized tracking matrices to achieve harmonic distortion suppression, preventing magnetic pickup sensor noise or electrical tooth ripples from causing signal jitter on the high-speed input lines. The module correlates raw turbine speed inputs directly with field-oriented vector control data paths, allowing the 2oo3 internal CPU matrix to execute shutdown commands within 12 ms whenever the preset velocity boundaries are breached.

Frequently Asked Questions

Q: How does the Energize-to-Trip (ETT) relay logic operate during a complete loss of the 24 VDC input power rails? A: In an ETT framework, the internal safety relays remain unpowered during normal operation and require positive electrical execution to initiate a shutdown. A complete loss of external power prevents the relays from energizing, thereby prioritizing process continuity over an automatic drop-out trip during power disruptions.

Q: Can an individual speed input sensor be disconnected or serviced while the overspeed module is running live process control loops? A: Yes. Because the module utilizes a hardware-based 2-out-of-3 (2oo3) voting matrix across three independent CPUs, a technician can isolate and service a single magnetic pickup input without tripping the system or interrupting active machinery protection monitoring.

Q: What are the specific terminal assignment criteria when routing mixed active and passive speed sensors to the MPU board inputs? A: Each of the three speed channels must be wired to its matching terminal block cluster. Passive magnetic pickups require no external biasing, whereas active or Hall-effect sensors must draw voltage from the regulated 24 VDC power terminals on the module backplane layout.

Field Installation Guidelines

Enclosure Mechanical Attachment: Mount the industrial housing onto a clean vertical panel surfaces inside the control cabinet. Secure all mounting bolts to satisfy standard industrial vibration-resistance profiles and prevent mechanical micro-fretting at the backplane interface.
Speed Sensor Cable Shielding: Run all MPU or Hall-effect sensor wires using individual twisted, fully shielded pairs. Terminate the outer copper shield braid exclusively at the dedicated instrument earth ground bus bar inside the local panel enclosure.
Redundant DC Feeder Segregation: Connect the dual 18-32 VDC power lines from two independent power supply modules. Route the primary and secondary feeder wires through separate wiring tracks to ensure that a localized cable fault cannot drop both input rails simultaneously.
Modbus Communication Line Isolation: Route the RS-485 serial links and Modbus TCP Ethernet cables away from high-current AC motor leads or inductive braking components to minimize high-frequency noise coupling across data packets.

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Maintenance Manager, USA

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