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 front panel indicate the functional status.

Input Power Wiring
MicroNet controls require a fixed wiring installation for ac applications. Ground leakage exceeds 3.5 mA
AC. Maximum ground leakage for ac installations is 7.2 mA at 60 Hz. A ground conductor connected to
the chassis is required for safety. The power supply grounding terminal(s) should also be connected to
earth to ensure grounding of the power supply printed circuit boards. The grounding conductor must be
the same size as the main supply conductors.
Branch circuit fuses, circuit breakers, and wiring must meet appropriate codes and authorities having
jurisdiction for the specific country (CE, UL, etc.). See Table 4-4 for maximum recommended fuse or
breaker ratings. Do not connect more than one main power supply to any one fuse or circuit breaker. Use
only the wire sizes specified in Table 4-4 which meet local code requirements. Time delay fuses or circuit
breakers must be used to prevent nuisance trips.
See MicroNet Plus Power Supply Troubleshooting (Section 5.5) for a description of the LED indications.
Input power connections are made to the power supply through a plug/header assembly on the front of
the power supply.
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