Product Description

For prime mover overspeed protection, Woodward’s ProTech 203 series offers several feature-rich digital systems. Devices in this series contain three speed-sensing units, which sense prime mover speed through three separate magnetic pickups (MPUs). The system actuates its relay output based on a hardware two-out-of-three vote after three separate speed calculates are performed.  

Model 8200-207 is one of the de-energize-to-trip models in the ProTech 203 series. This particular model is the 24 Vdc input version. Each of the three speed-sensing units has its own power supply, all with the same input rating. The voltage range of this system is 18–32 Vdc, 5.12 W. The ProTech 8200-207 has a speed-sensing frequency range of 100 Hz to 32 kHz and a trip-point frequency range of 250 Hz to 25 kHz.

The three-unit design of the 8200-207 system offers several features to all but eliminate downtime in operations. In the event any individual speed-sensing unit is offline, control of the system is maintained by the other two. This permits continued operations if a unit is being tested, trips, or needs replacement. Separate LEDs alert errors in the unit's CPU, or its MPU or wiring. There is both an LED and a separate alarm output to indicate a tripped speed-sensing unit.

Details on troubleshooting, testing, and more can be found in the ProTech 203 Overspeed Protection System Manual 85206 (Revision F), which is available online.