Drive maintenance problems set the input voltage fluctuation requirements? Usually a fairly wide range of input voltage motor soft-start maintenance, it 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 the allowable voltage range limit: undervoltage protection (lv), the drive will stop (about 300v) Limit: overvoltage protection (ov), the drive will also stop * input voltage exceeds 506v Schneider soft-start maintenance, ov can not protect the contactor, fan. * The ability to withstand the pressure of the rectifier 1600v, generally not due to over voltage damage .③. For input voltage fluctuation of the brand soft-start maintenance, usually avr (regulated) feature will work automatically. Drive repair entry - circuit function varistors varistors are mainly used in transient overvoltage protection, but it is similar to the voltage characteristics of the semiconductor regulator, but also it has a variety of circuit elements function, for example, used: (1) DC high voltage low current regulator element, its stable voltage up to several thousand volts or more, which is a silicon regulator can not achieve. (2) the voltage fluctuation detection element. (3) DC bottle displacing element. (4) The equalizing element. (5) Fluorescent actuating element Siemens soft-start maintenance | Ming mountain soft-start maintenance | Shen Min electrically by the Shenyang Electric Co. on offer. Shenyang Electric Co. on people (www.zsmsy.com) strong, credible, and other industries in other Shenyang, Liaoning province has accumulated a large number of loyal customers. The company better work attitude and constantly improve the innovative ideas will lead sink into the brilliant electric and you work for a better future!