3 phase electric motor starter wiring diagram

3 phase electric motor starter wiring diagram

I once watched a plant manager turn white as a ghost when a brand-new 50hp centrifugal pump motor emitted a violent bang and a cloud of acrid blue smoke. We were on a tight commissioning schedule, and he'd pushed the junior electrician to "just get it spinning" by following a generic 3 Phase Electric Motor Starter Wiring Diagram found in an old manual. The kid had wired the contactor and the overload relay correctly on the power side, but he’d completely misinterpreted the seal-in circuit for the 120V control coil. Because the control transformer wasn't fused properly and the start/stop station was wired in a way that bypassed the thermal overload's NC (normally closed) contact, the motor tried to start against a locked rotor while the protection circuit was essentially blinded

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Leah Liu

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