These instantaneous high voltages, often exceeding twice the switching voltage, induce momentary high voltages across the motor windings. When these voltages surpass a critical threshold, partial discharges occur between the surfaces of the winding insulation.
[pdf] This is detected by an imbalance of the currents supplying the motor implying a leakage current to earth is present. This is usually caused by poor insulation resistance to earth. POSSIBLE FIXES: 1. Check insulation resistance of the motor and cabling. 2. Check that there are no power factor correction. .
Overvoltage This is caused by a high intermediate circuit DC voltage. This can arise from high inertia loads decelerating too quickly, the motor turns into a generator and. .
This occurs when the motor is taking too much current with reference to the value in Group 99, motor data. POSSIBLE FIXES: 1. Check that motor’s load is not excessive. 2. Check acceleration time – too fast an acceleration of a high inertia load will cause too. .
We hope you found the information in this article useful if you have a fault not listed and you need technical assistance contact our engineering team.
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