At IDS we have a wealth of inverter experience. We have been an ABB Partner for over 20 years and are used to supporting clients with a variety of inverter-controlled applications. In this article we look at the 3 most common faults on inverters and how to fix them:
1. Overvoltage and Undervoltage
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 increases the inverter’s DC voltage. There are other causes of DC overvoltage, however.
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Undervoltage
This is caused by low intermediate circuit DC voltage. This can be caused by a missing supply voltage phase from a blown fuse or faulty isolator or contactor or internal rectifier bridge fault or simply low mains voltage.
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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.
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This occurs when the motor is taking too much current with reference to the value in Group 99, motor data.
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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 by emailing your enquiry to [email protected]
If you are an existing client, you can take advantage of our 24/7 technical support by calling us on 0115 944 1036 anytime!
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