The gantry crane control system using D32 inverter has been put into operation for more than three years, and has achieved good economic and social benefits:

• * The control device operates reliably, has good environmental adaptability, can resist harsh environments such as oil pollution, dust and damp heat, and has a low failure rate; 

• *Excellent current limiting characteristics, strong overload capacity, can effectively reduce frequency conversion overload, overcurrent protection, and maximize production continuity; 

• * The starting and running process is smooth and efficient, safe and reliable.