Woodward 9905-463 ProTech-GII Datasheet & Technical Manual

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Woodward 9905-463 ProTech-GII Series The Woodward 9905-463, also cataloged as the 9905-463 Overspeed Protection Module, operates as a dedicated hardware...

SKU: 9905-463

Manufacturer: Woodward
Product No.: 9905-463
Product Type: Overspeed Protection Systems
Product Origin: USA
Payment:T/T, Western Union
Weight: 1590g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Woodward 9905-463 ProTech-GII Series

The Woodward 9905-463, also cataloged as the 9905-463 Overspeed Protection Module, operates as a dedicated hardware component for high-integrity overspeed detection and safety shutdown execution within ProTech-GII network platforms.

Hardware Specifications

Parameter	Specification
Model	9905-463
Brand	Woodward
Origin	United States
Weight	1.59 kg
Dimensions	Not specified (standard ProTech-GII chassis dimensions)
Operating Temp	-20 to +60 deg C
Power Consumption	24 VDC (18-32 VDC operating range; supports redundant inputs)
Architecture	Triple Modular Redundant (TMR)
Voting Logic	2-out-of-3 (2oo3) Hardware-based Voting
Trip Configuration	De-Energize-to-Trip (DET) / Fail-Safe
Response Time	< 12 ms (Total response from detection to relay)
Speed Inputs	3 Independent Magnetic Pickups (MPUs) or Proximity Probes
Relay Outputs	Redundant Form-A and Form-C Safety Relays
Communication	Modbus RTU (RS-485) and Modbus TCP (Ethernet)
Protection Rating	IP20 Industrial Metal Enclosure

Industrial Drives & Governors Properties

The Woodward 9905-463 integrates specific thermal heat sink dissipation profiles across its three isolated hardware channels to maintain algorithmic processing stability under sustained monitoring loads. Designed for steam, gas, and hydro turbine safety loops, the module maintains an ultra-low latency actuator loop feedback response, forcing relay contact transitions within 12 ms of a verified velocity fault. The device runs deterministic hardware-based 2-out-of-3 (2oo3) voting logic, continuously comparing incoming pulse trains from independent passive or active speed sensors to intercept mechanical overspeed events before they exceed structural design parameters.

Frequently Asked Questions

Q: How is input power handled to maintain uninterrupted overspeed protection?

A: The hardware features terminals for redundant 24 VDC power inputs over an 18-32 VDC operating envelope. If one external supply line fails, the internal diode-OR auctioneering circuit switches seamlessly to the alternative supply rail without disturbing the internal speed processing logic or triggering a trip sequence.

Q: What is the mechanical state of the safety relays during a total control power failure?

A: The 9905-463 is hard-configured for De-Energize-to-Trip (DET) operation. Under standard operational run-states, the internal trip relays remain continuously energized; a total loss of power, an internal microprocessor fault, or a field circuit breakage drops the coil current instantly, executing a fail-safe mechanical trip.

Q: Can this overspeed device transmit diagnostics to a centralized distributed control system?

A: Yes, the unit utilizes built-in Modbus RTU serial (RS-485) and Modbus TCP (Ethernet) communication paths. These links enable real-time streaming of channel-specific tracking data, peak hold values, sensor integrity metrics, and hardware fault registers to supervisory DCS and SCADA networks.

Field Installation Guidelines

Enclosure Orientation: Secure the IP20 industrial metal housing inside a clean, unventilated control bay using four rigid panel-mounting screws. Confirm that the enclosure base achieves solid metallic contact with the backplate to ensure a dependable chassis ground path.
Speed Transducer Cable Layout: Install independent, twisted-shielded copper wires for each of the three speed inputs. Route these signal lines through dedicated steel conduits separated from high-voltage AC generator bars or inductive switching networks to isolate against cross-talk.
Drain Wire Terminations: Terminate the speed sensor cable shields exclusively at the designated grounding bus inside the control panel frame. Do not connect the shields at the turbine sensor end to prevent high-frequency current loops from introducing signal jitter.
Output Relay Contact Protection: Connect the Form-A and Form-C safety relays using appropriate conductor gauges mapped to the inductive load of the trip solenoid. Apply transient voltage suppression components directly across the external inductive devices to inhibit contact arcing during a shutdown event.

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