在生活和生產(chǎn)中，經(jīng)常使用漏電開關(guān)，但變頻器有時(shí)使用較少。在車間安裝開關(guān)時(shí)，大多數(shù)制造商經(jīng)常使用漏電開關(guān)作為主開關(guān)。當(dāng)使用變頻控制時(shí)，問題就展現(xiàn)出來了，漏電開關(guān)使用一段時(shí)間以后總會(huì)出現(xiàn)跳閘現(xiàn)象。

 

Leakage switches are often used in daily life and production, but frequency converters are sometimes used less. When installing the switch in the workshop, most manufacturers often use the leakage switch as the main switch. When the frequency conversion control is used, the problem arises. After the leakage switch is used for a period of time, there will always be tripping.

 

 

 

個(gè)人經(jīng)驗(yàn)是，在安裝帶變頻器的機(jī)器時(shí)，必須排除漏電或單獨(dú)使用塑料外殼斷路器，以免開關(guān)跳閘。引起錯(cuò)誤的行動(dòng)!

 

Personal experience is that when installing machines with frequency converters, leakage must be eliminated or plastic case circuit breakers should be used alone to avoid switch tripping. Actions that cause errors!

 

 

 

30毫安的漏電流不能用在變頻器上。100mA的泄漏電流不能用來保護(hù)人身安全。主要原因是變頻器的漏電流會(huì)導(dǎo)致變頻器誤動(dòng)作。如果必須安裝泄漏電流，應(yīng)選擇100mA，以防止線路絕緣因火災(zāi)損壞。

 

Leakage current of 30 mA cannot be used in frequency converter. 100 mA leakage current can not be used to protect personal safety. The main reason is that the leakage current of the converter will lead to the wrong operation of the converter. If leakage current must be installed, 100 mA should be selected to prevent line insulation from being damaged by fire.

 

 

 

使用變頻器時(shí)，不得使用漏電保護(hù)器。這是使用變頻器的主要原則。

 

When using frequency converter, leakage protector should not be used. This is the main principle of using frequency converter.

 

 

 

有些客戶在使用變頻器時(shí)會(huì)為變頻器選擇相應(yīng)的漏電保護(hù)器。最終結(jié)果是變頻器將一起移動(dòng)，漏電保護(hù)器將運(yùn)行，系統(tǒng)根本不運(yùn)行。

 

Some customers will choose the appropriate leakage protector for the converter when using the converter. The end result is that the converter will move together, the leakage protector will run, and the system will not run at all.

 

 

 

為什么呢?

 

Why?

 

 

 

漏電保護(hù)器的原理是零級(jí)電流為零。使用變頻器時(shí)，零級(jí)電流不能為零。

 

The principle of leakage protector is zero current. When using the frequency converter, the zero-order current can not be zero.

 

 

 

變頻器的輸出側(cè)是pwm波。在電動(dòng)機(jī)電纜和地面之間有一條長電纜的電容效應(yīng)。當(dāng)使用帶有屏蔽層的電纜時(shí)，電容效應(yīng)更為明顯。在變頻器工作時(shí)，電容器充電放電，并有電流通過電容器流入地球，然后變頻器從入口線上的地線回流，形成電流回路。如果進(jìn)口側(cè)使用泄漏保護(hù)器，它將起到切斷系統(tǒng)的作用。

 

The output side of the converter is the PWM wave. There is a capacitive effect of a long cable between the motor cable and the ground. When using cable with shielding layer, the capacitance effect is more obvious. When the frequency converter works, the capacitor is charged and discharged, and the current flows into the earth through the capacitor. Then the frequency converter flows back from the line on the entrance line to form a current loop. If the leakage protector is used on the import side, it will cut off the system.

 

 

 

所以，不要把你的變頻器配上漏電保護(hù)器。如果你想確保安全，做好接地設(shè)備。

 

So don't attach your converter to the leakage protector. If you want to ensure safety, do a good job of grounding equipment.