Ben

What Causes a Contactor to Chatter? 3 Common Causes and Solutions.

Walking by a cabinet and hearing a chattering contactor makes most electricians turn around and start troubleshooting. These concepts may be foreign to technicians that haven’t learned about contactors. Because of this, it’s important to familiarize yourself with contactor troubleshooting. In my experience, the three most common causes of contactor chatter are; low voltage, bad …

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120v Solenoid Coil Resistance

A valve

120v solenoid coil resistance will vary depending on the model of the solenoid. Therefore, it is best to test an identical coil’s resistance. You could test a new solenoid or one that is working. You will become familiar with the resistances of coils in your facility over time. Should a Coil Have Continuity? Coils require …

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How to Check Phase Rotation With a Multimeter

Unfortunately, It isn’t possible to check phase rotation with a standard multimeter. Phase rotation must be checked with a specialized tester like the fluke 9040 or Amprobe PRM-6. These testers allow technicians to ensure equipment like pumps and compressors won’t be damaged by incorrect rotation. If you do not have access to a phase rotation …

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What is a Motor Control Center

MCC Cartoon

What is a motor control center? They are the industry-standard way of distributing power to motors and equipment in industrial and large commercial buildings. Motor control centers, or MCCs, come in different shapes and sizes and are manufactured by various different brands. I’m most familiar with Allen-Bradley centerline MCCs, although the principles in this article …

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