Cause : Brake OL Trip comes when the calculated temperature of the dynamic braking resistor is too high. The temperature is calculated by a thermal model.

• If the resistor is internal, the model uses resistor characteristic stored in the power structure EEPROM memory.
• If the resistor is external, the model uses values of parameters 416 [Brake PulseWatts] and 417 [Brake Watts].

1. Verify actual temperature of brake
-If hot, wait for brake to cool
-If cold, cycle power to the drive

2. If cold, verify Par 416 [Brake PulseWatts] and Par 417 [Brake Watts] are correct.