Jinan inverter maintenance: the soft starter manufacturer talks about how to select the rated current of the soft starter. Many people who have touched the soft starter know that the rated current basis of the soft starter is all marked on the factory nameplate, and this rated current includes the rated current of the input side and the output side respectively. How to select the rated current of soft starter in normal application, after all, it is closely related to the use effect of frequency converter. Today, the frequency converter manufacturer will come to discuss this problem with you.
I. about selecting the rating on the input side.
变频器厂家表达，键入侧的额定电流关键为工作电压和相数。而针对中小型容积的软启动器键入工作电压的额定电流一般 有这几类(全是相电压)： 第一类是普遍的380V/50Hz、三相电的，此类早已运用于绝大部分机器设备中，很广泛
According to the inverter manufacturer, the rated current at the input side is the working voltage and the number of phases. The rated current of input working voltage for small and medium volume soft starters generally includes these types (all phase voltage): the first type is 380V / 50Hz, three-phase electric, which has been widely used in most of the machine equipment.
The second type is 200-230v / 50Hz or 60Hz, three-phase electric. This key is used in imported machinery and equipment. The third type is 200-230v / 50Hz, single-phase, which is dedicated to small volume machinery and equipment or some household appliances.
II. About selecting the rating of the output side.
Rated output voltage refers to the maximum output voltage of the frequency converter. In most cases, it is the output voltage value when the output frequency is equal to the rated frequency of the motor. According to the manufacturer of frequency converter, in general, there is no special application scenario, and the value of rated output voltage of frequency converter is the same as that of input voltage.
The rated output current (in) mainly refers to the effective value of the maximum AC current that can be continuously output by the frequency converter. The manufacturer of the frequency converter emphasizes that the user mainly selects the appropriate frequency converter according to this value.
Applicable to motor power. It mainly refers to the standard 4-pole motor as the standard object, which represents the range value of motor power that can be driven within the rated output current according to the manufacturer.
The overload capacity of frequency converter mainly refers to the allowable range and time period when its output current exceeds the rated current. Most frequency converters are set at 150% in, 60s or 180% in, 0.5s. The frequency converter for load speed regulation of similar fans and pumps is usually set at 120% in and 60s.
It is very important to know the basic parameters of the frequency converter and select according to the specific use situation. Therefore, it must be confirmed with the frequency converter manufacturer and guided by professionals when purchasing.