Cause : Braking Resistor Overheat comes when braking resistor protection was triggered. Fault detection is enabled when L8-01 = 1 (disabled as a default).

1. Deceleration time is too short and excessive regenerative energy is flowing back into the drive

• Check the load, deceleration time, and speed.
• Reduce the load inertia.
• Increase the deceleration times (C1-01 to C1-08).
• Replace the dynamic braking option with a larger device that can handle the power that is discharged.

2. The duty cycle is too high. Check the duty cycle. Maximum of 3% duty cycle is available when L8-01 = 1.

3. Excessive braking inertia. Recalculate braking load and braking power. Reduce the braking load by adjusting braking resistor settings.

4. The braking operation duty cycle is too high. Check the braking operation duty cycle. Braking resistor protection for ERF type braking resistors (L8-01 = 1) allows a braking duty cycle of maximum 3%.

5. The proper braking resistor has not been installed.
• Check the specifications and conditions for the braking resistor device.
• Select the optimal braking resistor.