Photoelectric switch on imports transformation _ Shenyang people (certified) _ Shenyang drive provided by the Shenyang Electric Co., the people. 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. Drive repair - overcurrent protection import transformation inverter drive repair, the overcurrent protection is intended primarily refers to a mutation in nature, the peak current exceeds the allowable value of the case because of the drive inverter overload poor, so the inverter overcurrent protection is a vital part, so far acs600 drive repair, has been well developed. Overcurrent reasons: the work that drives the system over current occurs during operation, overcurrent reason roughly from the following aspects:. ① impact loads encountered motor or transmission appears "stuck" phenomenon converter, causing the motor sudden increase in current output short-circuit photoelectric switch import transformation ② inverter, such as the output end of the motor cable short circuit occurs between each other, or the occurrence of short circuit inside the motor. ③ drive itself is not working properly, such as inverters Two anomalies bridge inverter devices appear in the same leg in the course of their work constantly alternating. For example, the ambient temperature is too high, or the inverter device itself aging and other reasons, so that changes in the parameters of the inverter device, resulting in alternating process, a device has been turned on, and the other has not yet had time to turn off the device, causing the same a bridge arm, under the two devices "through", the DC voltage of positive and negative electrodes is short-circuited. 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. Inverter repair the fault of case-control roller motor AEG Maxiverter-170/380 inverter has the speed feedback value is greater than the speed setpoint by the observation that: a) there is no such situation in the rolling process, after leaving the steel roller, just happen; b) when the velocity feedback value is greater than the speed setpoint, DC link voltage is 125% of the rated voltage of more than 115% of the limit set value; line voltage c) has exceeded the upper limit of the inverter; In the rolling process, the drive roller motor speed control will rise, after leaving the roller steel roller motor speed to the original speed, because this drive is not installed brake, through voltage reducer Regulators limit braking current to maintain the DC link voltage does not exceed 115% of the limit set value (the default), because the line voltage is too high, the DC link voltage exceeds the set limit, when decelerating voltage regulator work, resulting in brake current is very small, the motor speed does not drop down, and in the rolling, grid load increased, the DC link voltage is less than 115% of the limit setpoint, the brake function returned to normal. At the time was unable to reduce the grid voltage, the DC link voltage setpoint limit increased to 127%, the drive is working properly. During shutdowns, we changed the gear power transformer according to the situation, so that the line voltage of the inverter within the permissible range, then the drive is working properly. 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.