Cause : Braking Transistor Overload Fault comes when the braking transistor reached its overload level. The "Braking Transistor Overload Fault" on a Yaskawa A1000 drive typically indicates an issue related to the braking transistor circuitry within the drive. 

1. The wrong braking resistor is installed. Select the correct braking resistor.
2. Use a regen converter, regen unit, braking unit, or other device to connect the +1 or +3 terminal to the - terminal. Set L8-55 to 0 to disable Internal Braking Transistor Protection.
3. The braking transistor use rate is high (i.e., the regen converter is large or the repetition frequency is high).
   • Change to a CDBR type braking unit.
   • Change to a regen converter.
   • Increase the deceleration time.
4. Check braking transistor inside the drive, if faulty then replace the drive.