Drive repair overcurrent protection processing method, when starting a liter of speed on the trip, which is very serious over-current phenomenon, mainly mechanical inspection work ① ② stuck there is no short-circuit the load side, with megger to ground There are no short ③ inverter power module there is no damage ④ motor starting torque is too small, the drag system not turn up two, when not immediately start the trip, but the trip during operation, the main check ① time setting up too fast short and longer acceleration time and deceleration time is set too short ② drive repair, lengthening the deceleration time ③ torque compensation (U / F ratio) is set too large, space-time caused by low-frequency load current is too large ④ electronic thermal relay setting improper action current set too small, causing the drive to malfunction on China Shenyang Electric Co. to undertake industrial automation and control system design, installation, engineering and maintenance; professional maintenance States converter, DC governor, PLC programmer repair operations. The company is market-oriented, technology and development, quality of survival. The company has a sound management system, advanced testing and inspection test equipment, with large-scale maintenance entity, truly provide customers with the best quality service. Failure Case ABB ACS600 drive repair drive at runtime DC overvoltage trip the inverter is equipped with a brake chopper and brake resistor drive repair, but foreign commissioning personnel when debugging the voltage controller selecting ON without using the brake chopper and brake resistor. In DC over-voltage trip after chopper and brake resistor input drive repair network, the result is more frequent trips. Operation Manual of the drive for DC overvoltage explanation of the reasons usually have 2 points: a) the line voltage is too high; b) the deceleration time is too short; the line voltage because the drive has been put into operation two months, and when the trip within the allowable range, the other inverter drive repair work to protect, combined with previous DC overvoltage understanding when dealing with drive failures that using voltage feedback controller to adjust the current to prevent DC over the case of pressure, rate of change of the load current is too large overvoltage caused an important reason, when controlled equipment to the scene to see, find a piece of material stuck in the gap between the conveyor belt, and after clearing, the drive is working properly. Open the drive casing inspection, found the line voltage has third gear selection device (400V, 500V, 690V) on the brake chopper to adapt to different line voltage, which shorting ring inserted in the 690V stalls, thus causing brake chopper and brake resistor to work the threshold is too high and the line voltage of 400V inverter ACS600 not work, will move to 400V shorting ring gear, by reducing the deceleration time trial, brake chopper filter and brake resistor is working. Shenyang, China Electric Co., Ltd. to undertake the industrial automation and control system design, installation, engineering and maintenance; professional maintenance States converter, DC governor, PLC programmer repair operations. Drive repair aftermarket | Yuhong drive repair | Shenyang on the people by the people on the Shenyang Electric Company. Shenyang Electric Co. on people (www.zsmsy.com) strong, credible, in other industries, such as Shenyang, Liaoning province has accumulated a large number of loyal customers. The company better work attitude and constantly improving people and innovative ideas will lead you to walk hand in hand on the Shenyang brilliant, for a better future!