The ProTech 203 Overspeed Protection System is a digital overspeed trip device
that senses prime mover speed through three magnetic pickups (MPUs). It
consists of three identical, independent, speed-sensing units which continuously
monitor prime mover speed and activate a trip relay when an overspeed
condition is detected. The trip relays of the three units are connected in a two
out-of-three voting configuration so that if any single unit fails, the ProTech
system will still provide the correct output.

The units' functions include the ability to display the actual speed
from each speed probe, display the highest speed signal, on-line testing,
and modular design that allows a single failed unit to be replaced
while the device is running. Light emitting diodes (LEDs) and digital
displays on the unit's front panel indicate the functional status.
Be careful when unpacking the ProTech® 203 system. Check the device for signs
of damage such as a bent or dented case and loose or broken parts. If damage
is found, notify the shipper immediately. The device may be stored in its original
shipping container until it is ready for installation. Protect the device from weather
and from extreme humidity or temperature fluctuations during storage.
Carefully study this chapter before choosing a location for the ProTech 203
system. Wiring and grounding considerations may influence the selection of a
location for the device.
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