DC link voltage too high

What does 07 mean?

The DC link voltage within the inverter has exceeded its permissible upper threshold. This condition commonly arises from regenerative energy fed back from the motor, often due to excessively short ramp-down times. Other causes include faulty braking resistor connections, incorrect resistor values, or an impermissible supply input voltage. High DC link voltage can damage the inverter's DC bus capacitors and output stage.

• Ramp time setting is too short, leading to excessive regenerative energy.
• Faulty connection between the brake coil and braking resistor.
• Incorrect internal resistance of the brake coil or braking resistor.
• Thermal overload in the braking resistor due to incorrect sizing for the application.
• Supply input voltage is outside the permissible voltage range.

Click steps to track your progress.

1. 1

   Increase the ramp time setting in the inverter parameters to allow for slower deceleration.

2. 2

   Check the connection between the braking resistor and brake coil for continuity and correct wiring.

3. 3

   Check the internal resistance of the brake coil or braking resistor (refer to the 'Technical Data' section for expected values).

4. 4

   Verify the sizing of the braking resistor for the application's load profile.

5. 5

   Measure the supply input voltage to ensure it is within the specified permissible voltage range.

6. 6

   Reset the fault by switching off the DC 24 V supply voltage to the inverter for at least 10 seconds.