Cause : VOLTAGE HIGH comes when the input voltage supplied to the drive is above the specified operating range or the intermediate circuit voltage (d.c.) is above the control card’s warning limit.
Here are some common causes and troubleshooting steps for a low voltage warning in a VFD:
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Voltage Supply: Check the input voltage supplied to the VFD. Ensure that it meets the voltage requirements specified by the manufacturer. Voltage fluctuations or drops can occur due to issues with the power supply or distribution system.
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Power Supply: Verify that the power supply feeding the VFD is stable and sufficient. Fluctuations or interruptions in the power supply can lead to low voltage warnings.
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Wiring and Connections: Inspect the wiring and connections between the power supply, VFD, and motor. Loose connections or damaged wiring can cause voltage drops and trigger low voltage warnings. Make sure all connections are tight and secure.
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Overload: Excessive load on the VFD or motor can result in voltage drops. Check for any overloading conditions and reduce the load if necessary.
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Faulty Components: Components such as capacitors, diodes, or voltage regulators within the VFD may be faulty and causing voltage fluctuations. Consult the manufacturer's documentation for guidance on diagnosing and replacing faulty components.
