A7/W7 - DC Overvoltage fault in danfoss drive
A7/W7 - DC Overvoltage fault in danfoss drive
Cause: The DC link voltage has exceeded the overvoltage limit. This often occurs when the motor acts as a generator, feeding regenerative energy back to the drive, especially with short deceleration ramps or high-inertia loads. A faulty braking transistor can also be a cause.
Solution:
Cause: The DC link voltage has exceeded the overvoltage limit. This often occurs when the motor acts as a generator, feeding regenerative energy back to the drive, especially with short deceleration ramps or high-inertia loads. A faulty braking transistor can also be a cause.
Solution:
- Increase the deceleration ramp time.
- Activate the over-voltage control function in the drive's parameters.
- Install or check the functionality of an external brake resistor and brake chopper.
- Verify that the input voltage is correct and stable.
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