Breakdown in Braking Unit and/or Braking Resistors

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This error signifies a fault within the regenerative braking unit or its associated braking resistors. This system is crucial for dissipating excess energy generated by the motor during deceleration, and a breakdown can cause DC bus overvoltage.

• Open circuit or short circuit condition in the braking resistor(s).
• Malfunction or failure of the braking transistor (chopper) circuit.
• Overheating of the braking resistors due to continuous or excessive regenerative energy.
• Faulty wiring or loose connections within the braking circuit.

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1. 1

   Visually inspect the braking resistors for any signs of burning, cracking, or physical damage.

2. 2

   Measure the resistance of the braking resistors; compare the measured value with the specified nominal resistance.

3. 3

   Verify all electrical connections between the drive, the braking unit, and the braking resistors for security and integrity.

4. 4

   If possible, check the operation of the braking transistor (chopper) for proper switching.