OV2-Trip (Overvoltage in intermediate circuit during operation)

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This fault indicates an overvoltage condition in the intermediate DC bus circuit during normal operation (KPS-600). This often occurs due to regenerative energy from the motor not being absorbed or dissipated by the braking resistor, causing the DC bus voltage to rise above safe limits and risking damage to the drive's power stage.

• OV2-Trip: Overvoltage detected in the intermediate circuit during operation (P1-16).
• Uncontrolled regenerative braking during rapid deceleration.
• External voltage surge on the AC supply.
• Faulty suppression circuit within the drive.

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1. 1

   Measure the DC bus voltage at terminals +UDC/-UDC during operation, especially during deceleration or lowering loads.

2. 2

   Verify the operation and resistance of the external braking resistor — ensure it is correctly sized and connected.

3. 3

   Check drive parameters for deceleration ramp times — increase these values if they are too short for the connected load inertia.