Siemens 6RA28 DC drives repair | Shenyang on China (certified) | repairs on China by Shenyang Electric Limited. Shenyang on China Electric Co. (www.zsmsy.com) is specialized in the "high-low-voltage inverter, high and low voltage soft starter, magnetic switches, programmable logic controller (PLC)" of the enterprise, the company of "honesty, hard service" concept, to provide you with the highest quality products and services. Welcome to inquire! Contact: Wei Song. Failure Case ABB ACS600 drive repair drive at runtime DC overvoltage trip the inverter is equipped with a brake chopper and brake resistor, but the foreign commissioning personnel when debugging the voltage controller without the use of selecting ON brake chopper and brake resistor. In DC overvoltage trip after chopper and brake resistor input, 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; because the drive has been put into operation two months 6RA22 repair, and tripping into the line voltage is within the allowable range, the other drive is working properly, combined with previous DC overvoltage understanding when dealing with drive failures that using voltage feedback controller to adjust the current to prevent DC overvoltage situations, the load current The rate of change is caused by excessive overvoltage is an important reason, when controlled equipment to the scene to view, 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) to accommodate different line voltage on the brake chopper, which shorting ring inserted in the 690V 200cn PLC Siemens file repair , thus causing brake chopper and brake resistor threshold value is too high to work in the line voltage of 400V inverter ACS600 not work, will move to 400V shorting ring gear, by reducing the deceleration time trial repair, brake chopper 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. Difference-mode drive repair basics and several power: Many just entering the electronics industry, who automation industry for analogue electronic circuits and digital electronic circuits, there are some doubts, by people who just joined this line is unclear, Of course, when contacted drive repair and maintenance will certainly be familiar with. The so-called analogue electronic circuits digital electronic circuit is actually relatively speaking. Mode voltage: generally refers to frequencies below Fast HZ, voltage-mode like tens of volts or less, and this signal using signal analysis / processing and related devices. Fast HZ signals above belong to the scope of high-frequency electronic circuits. More than one hundred-volt electrical signals are strong or high-voltage areas. Electric Number: refers generally to digital logic and computational analysis, signal processing 6RA22 repair, digital logic circuits and the use of the composition. The number of input and output of electric power in general by mold, forming the basic logic element is the number of electric power in triode mode saturation characteristics and cut-off characteristics. Since the number of electrically large scale integrated, complex mathematical calculations, temperature, interference, aging and other parameters are not sensitive to the future direction of development. But in the real world information is analogue information (light, radio, heat, cold, etc.), it is impossible to eliminate the electric mode, but in terms of a system module electrical parts may be reduced. Constitute ideal for: analogue input --AD sampling (digitizing) - digital processing --DA Conversion - analogue output.