Four compressors, each powered by a 400-hp motor, provide plant air. Lately, the plant’s been experiencing low pressure episodes. One effect is pneumatically-powered lifting apparatus that have dropped product, causing costly breakage. These low pressure episodes occur when the motor overloads open on one or more of the compressor motors. The breakers don’t trip and the compressor units check out, so the maintenance response has been to just replace the overloads. The system ...

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