Troubleshooting Motor Control Circuits — Part  2

Troubleshooting Motor Control Circuits — Part 2

Isolating problems in the control circuit

In Part 1 of this two-part series, we presented a 3-phase, 480VAC motor circuit with its associated controls (Figure). We stepped through a logical, systematic approach to troubleshoot the main power portion of the circuit from the incoming power location through the fused disconnect, starting contacts, and overloads to the motor. If all of the above items checked out sati

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