Cause: Braking resistor overheated comes when the electronic thermal protection for the braking resistor has been activated. This fault means that the external dynamic braking resistor, connected to your VFD (typically to the P(+) and DB terminals), has become excessively hot, exceeding its safe operating temperature. 

dbh fault in fuji FRENIC MEGA drive indicates a Braking Resistor Overheat Fault. This means the braking resistor has exceeded its allowable temperature, and the drive has shut down to prevent damage.

• Reduce the deceleration time to spread out braking over a longer period.
• Confirm the resistor is properly rated (Ω, watts, duty cycle) for your motor/load.
• Check for physical damage or discoloration due to overheating.
• Ensure the resistor is in a well-ventilated area.
• Choose a properly rated resistor per your drive’s manual and application needs.