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  • 变频器为什么不能使用漏电保护器?
  • 本站编辑:杭州邦瑞机电有限公司发布日期:2019-09-20 20:07 浏览次数:
在生活和生产中,经常使用漏电开关,但变频器有时使用较少。在车间安装开关时,大多数制造商经常使用漏电开关作为主开关。当使用变频控制时,问题就展现出来了,漏电开关使用一段时间以后总会出现跳闸现象。
 
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.
 
 
 
个人经验是,在安装带变频器的机器时,必须排除漏电或单独使用塑料外壳断路器,以免开关跳闸。引起错误的行动!
 
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毫安的漏电流不能用在变频器上。100mA的泄漏电流不能用来保护人身安全。主要原因是变频器的漏电流会导致变频器误动作。如果必须安装泄漏电流,应选择100mA,以防止线路绝缘因火灾损坏。
 
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.
 
 
 
使用变频器时,不得使用漏电保护器。这是使用变频器的主要原则。
 
When using frequency converter, leakage protector should not be used. This is the main principle of using frequency converter.
 
 
 
有些客户在使用变频器时会为变频器选择相应的漏电保护器。最终结果是变频器将一起移动,漏电保护器将运行,系统根本不运行。
 
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.
 
 
 
为什么呢?
 
Why?
 
 
 
漏电保护器的原理是零级电流为零。使用变频器时,零级电流不能为零。
 
The principle of leakage protector is zero current. When using the frequency converter, the zero-order current can not be zero.
 
 
 
变频器的输出侧是pwm波。在电动机电缆和地面之间有一条长电缆的电容效应。当使用带有屏蔽层的电缆时,电容效应更为明显。在变频器工作时,电容器充电放电,并有电流通过电容器流入地球,然后变频器从入口线上的地线回流,形成电流回路。如果进口侧使用泄漏保护器,它将起到切断系统的作用。
 
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,不要把你的变频器配上漏电保护器。如果你想确保安全,做好接地设备。
 
So don't attach your converter to the leakage protector. If you want to ensure safety, do a good job of grounding equipment.

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