ABB P3EDb HENF452778R1 Overspeed Tachometer Module

PROBLEM A ship stabilizer control fin has a rotary position sensor which puts out ±10 V depending on the position of the fin. The position must be monitored by a remotely located main control unit for use in operation of the stabilization system. Due to noise immunity concerns and the distance required a 4-20 mA signal is used.

Applying a short 

circuit to any of the signal input terminals will not affect the modules. Exposing the signal input to high voltage will damage the unit but using a zener diode, due to its resistance value, will cause the input range to need recalibrating. Try a Varistor or TransZorb®. Do NOT under any circumstances short circuit the signal output, the unit can be damage

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