The GE Multilin is a popular motor management and protection device. The Mulitilin is not particularly difficult to install or setup, but can present an challenge if you’re not familiar with these types of devices.
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Large motors running on critical applications often need additional protection from that afforded by simple thermo-mechanical trip devices. These motors often have RTD’s, (Resistive Thermal Devices) which are usually installed in both the stator and bearings to detect dangerous rises in temperature.
Simply monitoring current may not be enough. As a for instance, if the motor is cooled by a fan attached to the shaft, as the motor speed slows, then the cooling afforded by the fan lessens. This may not present a problem on a centrifugal load since the current draw will usually decrease exponentially with the decrease in speed.
However, on many applications this simply isn’t the case, and more careful monitoring is required. Additionally, there can be air blockages, or external environmental changes that if undetected, can cause destruction of the motor.
The GE Mulltilin is a popular and reliable device, that has a relatively low cost, especially on large or critical motors.
The Multilin can be programmed and setup to monitor bearing temps, stator temp, ambient air temp, and coordinate these trip points with motor speed. In addition, it can monitor over voltage, ground faults, single-phasing and other faults.
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