Electrician Red Seal · Question
A motor connected via a variable frequency drive (VFD) is found to be overheating, but not tripping any overload. The VFD is properly sized for the motor's full load current. After checking the mechanical load and finding it to be within limits, what common VFD-related parameter should the electrician investigate?
A high carrier frequency setting in a VFD can increase motor heating due to increased switching losses and harmonics. Adjusting it downwards, if possible withou
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Question: A motor connected via a variable frequency drive (VFD) is found to be overheating, but not tripping any overload. The VFD is properly sized for the motor's full load current. After checking the mechanical load and finding it to be within limits, what common VFD-related parameter should the electrician investigate?
Answer options: ✅ The VFD's carrier frequency setting.
- The contactor coil voltage.
- The power factor of the main supply.
- The rating of the control transformer.
Correct answer: The VFD's carrier frequency setting.
Explanation: A high carrier frequency setting in a VFD can increase motor heating due to increased switching losses and harmonics. Adjusting it downwards, if possible without causing other issues, can help reduce motor temperature.
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