山東變頻器維修說到:使用變頻器時,不能使用漏電保護器.這是變頻器使用的一大原則.有些客戶在使用變頻器時,為變頻器選了相應的漏電保護器.最后的結果是:變頻器一起動,漏電保護器就動作,系統根本無法運行.
Shandong Inverter Maintenance said: when using frequency converter, leakage protector must not be used. This is a major principle of frequency converter. Some customers choose the corresponding leakage protector for frequency converter when using frequency converter. The final result is: when the frequency converter works together, leakage protector will act, and the system can not operate at all.
山東變頻器維修
Maintenance of Shandong Inverter
漏電保護器的原理是,零序電流為零.而使用變頻器時,零序電流不可能為零.
The principle of leakage protector is that zero sequence current is zero. When using frequency converter, zero sequence current cannot be zero.
變頻器輸出側為PWM波,電機電纜與大地之間有長電纜的電容效應,使用帶屏蔽層的電纜時,電容效應更加明顯.
The output side of frequency converter is PWM wave. There is capacitance effect of long cable between motor cable and ground. When using cable with shielding layer, the capacitance effect is more obvious.
山東變頻器維修廠家講在變頻器工作時,電容在充放電,有電流通過電容流入大地,并從進線側的接地線再流回變頻器,形成電流回路.如果在進線側使用了漏電保護器,那么它會動作,切斷系統運行.所以不要為你的變頻器配漏電保護器了.如果要保證安全,做好設備接地就行了.
Shandong Inverter Maintenance Factory said that when the converter is working, the capacitor is charging and discharging, and the current flows into the earth through the capacitor, and then flows back to the converter from the grounding wire on the input side to form a current loop. If the leakage protector is used on the input side, it will act and cut off the system operation. So don't allocate leakage protector to your converter. Well, if you want to ensure safety, just do a good job of grounding equipment.
配了保護器應該怎么調節:
How should the protector be adjusted?
1、增大設備負載,也就是馬達負載,變頻器在啟動時漏電流就不會很大了.
1. Increase the load of the equipment, that is, the motor load, so the leakage current of the frequency converter will not be very large when it starts.
2、把漏電保護器更換為變頻器專用漏電保護器,市面上有賣變頻器專用漏電保護器的.
2. Replace the leakage protector with the special leakage protector for frequency converter. There are special leakage protectors for frequency converter on the market.
3、漏電保護器上一般會有一個調節器,把調節器調大即可.
3. There is usually a regulator on the leakage protector. It is enough to adjust the regulator larger.
4、把漏電保護器短接掉.
4. Short disconnect the leakage protector.
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