The fault light on the B4 bucker has come on
First, ensure the E-stop hasn’t been activated. If the E-stop isn’t active, the motor drive is sensing a malfunction. Unplug the machine, disconnect the cartridge, reduce the speed control to the lowest setting and plug the machine back in. Clear the area around the motor coupling and turn the machine on. If the fault persists, there may be an electrical issue-check your electrical service and remove any extension cords.