Brake resistor wiring

What does 7184 mean?

A short circuit has been detected in the brake resistor wiring, or there's an issue with the brake chopper control circuit. This prevents the brake resistor from functioning correctly, leading to potential DC bus overvoltage and can damage the chopper or drive components.

• Short circuit between the brake resistor terminals (BR+, BR-) or to ground in the connecting cables.
• Damage to the insulation of the brake resistor wiring, leading to phase-to-phase or phase-to-ground fault.
• Internal fault in the brake chopper circuit's IGBT gate drive or current sensing circuitry.
• Moisture or contamination bridging the brake resistor terminals or control circuit.
• Brake resistor cables routed too close to power conductors causing induced short.

Click steps to track your progress.

1. 1

   Power off and lock out the drive. Disconnect the brake resistor wiring from the drive's BR+ and BR- terminals.

2. 2

   Perform a continuity test on the brake resistor wiring from the drive to the resistor, checking for shorts to ground or between conductors.

3. 3

   Measure the insulation resistance of the brake resistor wiring using a megohmmeter (e.g., 500VDC test).

4. 4

   Inspect the drive's internal brake chopper board for signs of arcing, burning, or component damage.

5. 5

   Verify the integrity of the connection points at both the drive and the brake resistor.