Product Introduction

The Bently Nevada 3500/82 stator insulation monitor is mainly used for monitoring the rotor resistance of the power grid. By changing the

combination of power contactors, the three-phase resistance of the motor can be controlled, thereby achieving precise control of the motor

speed. This type of monitor is commonly used in situations where precise control of fan speed is required, such as industrial cooling systems,

to ensure that air flow meets process requirements.

Operating principle and function

The monitor is operated through a local PLC (Programmable Logic Controller) and DCS (Distributed Control System). The local PLC is

responsible for controlling the rotor resistance of the power grid, receiving signals from the power contactor and auxiliary contactor, and

increasing or decreasing the rotor resistance according to these signals to adjust the fan speed. To reduce malfunctions and failures, the

local PLC can be removed, all DI, DO, and feedback can be handed over to DCS, and a PLC like program can be written in DCS

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