8200-203 WOODWARD Overspeed Protection System

There are two versions offered in the ProTech 203 Overspeed Protection series by Woodward: de-energize-to-trip and energize-to-trip. Model 8200-203 is the 120 Vac/dc input model of the de-energize-to-trip versions. This model consists of three separate, identical speed-sensing units, each with its own power supply. These units sense prime mover speed through magnetic pickups and perform individual speed calculations, which are then used in a two-out-of-three hardware vote.

Model 8200-203 has a rich feature set, including remote reset, LED performance indicators, built-in self-test, an alarm output, and a key lock.

The LED performance indicators are located on the front panel of the units, alongside a touchpad and digital display. Together, the LEDs and digital display offer a quick, clear overview of the current functional status of the 8200-203 system.

The built-in self-test feature is achieved through a built-in frequency generator. This setup allows for individual units to be tested while the prime mover remains online. During testing of a unit, complete control is simply taken on by the two other units. This configuration also means that should anyone speed-sensing unit fail on the 8200-203, it can be replaced with little to no downtime required.