140CRP93100 变频器箱体结构的选用

Description

140CRP93100 变频器箱体结构的选用

变频器箱体结构的选用
变频器的箱体结构要与环境条件相适应，即必须考虑温度、湿度、粉尘、酸碱度、腐蚀性气体等因素。常见有下列几种结构类型可供用户选用：
1）敞开型IPOO型本身无机箱，适用装在电控箱内或电气室内的屏、盘、架上，尤其是多台变频器集中使用时，选用这种型式较好，但环境条件要求较高；
2）封闭型IP20型适用一般用途，可有少量粉尘或少许温度、湿度的场合；
3）密封型IP45型适用工业现场条件较差的环境；
4）密闭型IP65型适用环境条件差，有水、尘及一定腐蚀性气体的场合 。
变频器容量的确定
合理的容量选择本身就是一种节能降耗措施。根据现有资料和经验，比较简便的方法有三种：
1）电机实际功率确定发。首先测定电机的实际功率，以此来选用变频器的容量。
2）公式法。当一台变频器用于多台电机时，应满足：至少要考虑一台电动机启动电流的影响，以避免变频器过流跳闸。

140CRP93100 变频器箱体结构的选用

Selection of inverter box structure
The box structure of the inverter should be adapted to the environmental conditions, that is, temperature, humidity, dust, pH, corrosive gas and other factors must be considered. There are several common structure types for users to choose from:
1) Open type IPOO itself has no chassis, suitable for installation in the electric control box or in the electrical room of the screen, disk, rack, especially when multiple frequency converters are used, the choice of this type is better, but the environmental conditions are higher;
2) Closed IP20 type is suitable for general use, can have a small amount of dust or a little temperature, humidity occasions;
3) Sealed IP45 is suitable for poor industrial site conditions;
4) Closed type IP65 is suitable for poor environmental conditions, water, dust and certain corrosive gases.
Determination of frequency converter capacity
Reasonable capacity selection itself is a measure of energy saving and consumption reduction. According to the available information and experience, there are three simple methods:
1) The actual power of the motor is determined. First determine the actual power of the motor, in order to choose the capacity of the inverter.
2) Formula method. When a frequency converter is used for multiple motors, it should meet the following requirements: The influence of starting current of at least one motor should be considered to avoid overcurrent tripping of the frequency converter.