Electrical Troubleshooting Quiz, Feb. 18, 2014

What should you do about a main drive motor failure?

The main drive motor for Line 3 has been replaced three times in as many years. The CFO knows your reputation as a crack troubleshooter, and she’s told the plant manager that unless he wants to keep buying replacement motors, to have you solve the failure cause.

After the second failure, a power analyzer was installed on the feeder. It shows a (corrected) PF of 96% at the motor, but the history doesn’t show any power event that could have caused the latest failure.

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