Why does my VFD trip on overvoltage when the motor slows down?
Your VFD trips on overvoltage during deceleration because the motor acts like a generator and pumps energy back into the drive, spiking…
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Industrial Equipment & Machinery
Practical, step-by-step fixes for industrial equipment & machinery problems — 55 published so far.
Why does my VFD-driven motor vibrate and overheat at low speeds below 20 Hz?
A VFD-driven motor vibrating and overheating at low speeds usually means the VFD's carrier frequency is too low, the motor isn't rated…
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Why does my VFD-driven pump motor trip on overcurrent at low speeds?
A VFD-driven pump motor tripping on overcurrent at low speeds usually means the VFD's torque boost or voltage/frequency ratio is set too…
See the fixWhy is a three-phase motor humming but not starting?
A three-phase motor that hums but won't start usually has one phase lost (single-phasing), a bad start capacitor if it's a single-phase…
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Why is my conveyor motor tripping the breaker under load?
Your conveyor motor is tripping the breaker under load most often because it is drawing too much current — from a jammed…
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Why is my hydraulic pump running hotter than usual?
Your hydraulic pump usually runs hot because the system is fighting extra resistance or losing cooling: a clogged filter, low oil, wrong-viscosity…
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Why is my three-phase motor humming but not starting?
A three-phase motor that hums but won't start usually has one missing phase, a failed start capacitor, or a locked rotor. Check…
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