The crane Yaskawa inverter repair case
Customer: Huicheng District of Huizhou City, a building three
Name: Crane frequency control cabinet
Model: Yaskawa G7 transducer and Yaskawa brake unit
Fault reason: frequency control cabinet through electric trip
Fault analysis: tower crane control cabinet with lifting system, rotary system, luffing system. There are two sets of Yaskawa inverter in the operating room in the cabinet, respectively to amplitude and rotary motor for driving, otherwise a PLC programmable controller, DC voltage control module two. Some of the intermediate relay. The power distribution cabinet is on the back balance arm. A built-in frequency converter, is used to drive the winch. There is also a vortex control module. Various types of contacts. Operation principle is the linkage control signal into the PLC, the PLC output signal to the inverter, inverter drive motor drive motor drive. After checking for the crane control cabinet a Yaskawa G7-55KW converter has lead to short-circuit. The customer to carry out the frequency converter to check, in the static measurement found that the module W phase and N phase have a short circuit. Separate control board measurement did not find the problem. Power on display is normal, in the removal of protection measurement driven W phase change driver and abnormal driving voltage stabilizing diode and a capacitor after normal measurement. In the measurement module, there are two modules in the W phase. After the replacement of all the normal power. This problem is found to cause the W phase short circuit. Followed by users understand that the brake unit short circuit caused by the frequency converter to send out the sound after the electric trip.
Jia Hong Wei repair service hotline: 0755-28916839, 13640994287 Shaw