Common faults of DC Drive:

 No display, overcurrent, overvoltage, undervoltage, overheating, overload, parameter error, no display, has shown no output, do not start, lack of phase, speed loop out-of-tolerance, current loop is super bad, without excitation, error excitation, low voltage output and heavy load alarm, red light error, communication failures, lost speed, can't reverse, fire insurance, burn thyristor module, voltage out-of-tolerance alarm speed is too high, Motor loss of magnetism, external protection, program error, main control board failure, etc.