Brake Resistor Wiring Fault

What does 7111 mean?

The brake resistor is incorrectly wired. This can lead to improper braking operation, potential damage to the resistor or drive, and ineffective energy dissipation during deceleration, creating unsafe operating conditions and poor speed control.

• Open circuit in the wiring between the drive's brake chopper terminals (e.g., R+, R-) and the resistor.
• Shorted wiring across the brake resistor terminals.
• Incorrect resistor value connected (e.g., 100 Ohm resistor connected instead of 10 Ohm).
• Loose connections at the drive's braking terminals or at the resistor terminals.
• Damage to the internal brake chopper circuit within the drive.

Click steps to track your progress.

1. 1

   De-energize the drive. Visually inspect all wiring connections from the drive's braking terminals (e.g., R+, R-) to the braking resistor for looseness or damage.

2. 2

   Measure the resistance of the braking resistor directly at its terminals using an ohmmeter. Compare this value to the specified resistance from the drive's manual or resistor nameplate.

3. 3

   Perform a continuity check on the wiring from the drive's braking terminals to the resistor terminals to ensure no open circuits.

4. 4

   Ensure the specified cable gauge and type are used for the braking resistor connection, particularly for longer runs.

5. 5

   Check drive parameters related to the braking resistor (e.g., P20-04 for external braking unit type, if applicable) for correct configuration.