9905-463 Woodward | ProTech-GII De-Energize-to-Trip Safety Unit

Woodward 9905-463 ProTech-GII TMR Digital Overspeed Protection Module

The 9905-463 (Model: 9905-463) is a high-integrity safety instrument designed for the absolute protection of critical rotating machinery. As a core component of the Woodward ProTech-GII series, this module provides independent, ultra-high-speed overspeed detection for gas, steam, and hydro turbines. The 9905-463 (Part Number: 9905-463) is architected with Triple Modular Redundancy (TMR), utilizing three completely independent CPUs and speed signal paths to eliminate single points of failure.

This specific version is configured for De-Energize-to-Trip (DET) operation. In this fail-safe mode, the internal safety relays remain energized during normal turbine operation. Should the system detect an overspeed condition, a hardware fault, or a total loss of control power, the relays instantly de-energize to trigger an emergency shutdown. With a deterministic hardware-based response time of less than 12 milliseconds, the 9905-463 (9905-463) ensures compliance with the most stringent industrial safety standards in power generation and petrochemical sectors.

Detailed Technical Specifications

The 9905-463 (Part Number: 9905-463) integrates redundant speed sensing with high-resolution digital logic.