8200-207

About the 8200-207

Used to control prime mover overspeed protection, the ProTech 203 series from Woodward offers several feature-rich digital systems; one of the models in this series is the 8200-207 model, which contains three speed-sensing units, that 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 calculations are performed.  

Model 8200-207 is one of the deenergize-to-trip models in the ProTech 203 series. This particular model operates on a power supply of 24 VDC. Each of the three speed-sensing units has its 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 numerous features but is best used to 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 module is being tested, trips, or needs replacement. Separate LEDs alert errors in the unit's CPU, MPU, or wiring. There is both an LED and an alarm output to indicate a tripped speed-sensing unit.

When the user is mounting the 8200-207 model, the unit must be placed in a location where it is protected from high-current or high-voltage devices that will produce electromagnetic interference. If the model experiences electromagnetic interference it can affect the performance of the unit.