Drive maintenance problems set the input voltage fluctuation requirements? General input voltage range is quite wide, so basically can adapt to any region of the country. However, when you install must first check the input voltage. ① low allowable voltage range:. 380v-15% = 323v (excessive load current increases) High value: 460v + 10% = 506v by contactors and fan constraints (18.5kw above) is less than 15kw dc excitation. . ② more than limited allowable voltage range limit: undervoltage protection (lv), the drive will stop (about 300v) Limit: overvoltage protection (ov), the drive will also stop * When the input voltage exceeds 506v, ov can not protect the contactor, fan. * Rectifier voltage withstand capability 1600v, generally not due to over voltage damage .③. For input voltage fluctuation OMRON touch screen repair, usually avr (regulated) feature will work automatically. Inverter repair fault diagnosis 1, rectifier damage is usually caused by grid voltage or an internal short circuit. Exclude internal short circuit in the case of a touch screen repair, replace rectifier bridge. When the scene failure, should focus on checking the user grid conditions, such as grid voltage, with or without the grid welding machine and other polluting equipment. 2, inverter module damage is usually caused by damage to the motor and drive circuit or cable fault. After fixing the drive circuit siemens touch screen repair, test drive waveform good condition, replace the module. After replacing the drive plate in field service, and must pay attention to check the motor and connection cable. In determining without any failure to run the drive. 3, no display power switching power supply is usually caused by damage or soft charge circuit damage caused by the DC circuit without DC, such as the startup resistor is damaged, the control panel will produce the same damage this situation. 4, over-voltage or under-voltage display usually due to input phase PVA touch screen repair, circuit and circuit board damp caused by aging. The solution is to find out the voltage detection circuit and the detection point, the replacement of defective devices. 5, showing an overcurrent or short circuit to ground is usually due to the current detection circuit is damaged. Such as Hall elements, op-amp circuit. 6, power supply and start-up display driver board is usually caused by over-current drive circuit or inverter module damage caused. 7, no-load output voltage is normal, after load an overload or overcurrent is usually due to improper parameter setting or driver circuit aging, causing damage to the module. Mitsubishi touch screen repair, electrical Shen (certified), Linghe touch screen repair on the people by the Shenyang Electric Limited. Shenyang on China Electric Co., Ltd. (www.zsmsy.com) is Shenyang, the other leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. On Shen Electrical leadership with the staff warmly welcome all inquiries negotiations to create a better future for electric Shen.