9903-543 Woodward | Triple Redundant Overspeed Protection

Woodward 9903-543 ProTech-GII TMR Energize-to-Trip Overspeed Protection Panel

The 9903-543 (Model: 9903-543) is a high-integrity digital overspeed protection system belonging to the Woodward ProTech-GII family. This specialized panel is engineered to provide fail-safe monitoring and emergency shutdown capabilities for critical rotating machinery, including gas, steam, and hydro turbines. The 9903-543 (Part Number: 9903-543) utilizes a Triple Modular Redundant (TMR) architecture, incorporating three independent microprocessors and three separate magnetic pickup (MPU) inputs. By employing a 2-out-of-3 (2oo3) voting logic, the system ensures that a single component failure will not cause a false trip, nor will it prevent a necessary safety shutdown.

As an Energize-to-Trip (ETT) version, the 9903-543 (ProTech-GII: 9903-543) is configured such that the trip relays are normally de-energized and must receive power to initiate a turbine shutdown. This specific logic is frequently required in plant safety architectures where the prevention of unintended trips due to control power loss is a priority. With a response time of less than 12 ms, this device provides authoritative protection against mechanical overstress, making it a standard in power generation and petrochemical facilities worldwide.

Detailed Technical Specifications

The 9903-543 (9903-543) provides precision speed sensing and robust communication for industrial environments.