QD type electric overhead crane takes PLC as main control device, main motor driving motions use AC frequency conversion single girder overhead crane

speed control technology, which make the crane realize soft start and stop in all conditions. In addition, wireless remote device

provides convenient operation mode for users.

Operation mode for control system: ground control + remote control

Below safety devices are set to ensure crane safety in all working conditions:

left and right lateral moving switch of lifting trolley;

lifting height limit switch;

winch speed loss protection device;

emergency stop switch, total power supply emergency stop switch is set on operation panel of cabin

load lifting limiter

control interlock, to confirm safe and reliable working in all working conditions, multiple interlock and interlocking protection devices are set by crane control hardware and software.

Phase sequence protector, over-voltage, under-voltage, wrong phase sequence and default phase inspection devices.