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.
Maintenance of Shandong Inverter
The principle of leakage protector is that zero sequence current is zero. When using frequency converter, zero sequence current cannot be zero.
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.
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.
How should the protector be adjusted?
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. Replace the leakage protector with the special leakage protector for frequency converter. There are special leakage protectors for frequency converter on the market.
3. There is usually a regulator on the leakage protector. It is enough to adjust the regulator larger.
4. Short disconnect the leakage protector.
Above is the information that Shandong Inverter Maintenance Factory can bring to you. You can collect it and learn more about it. You can pay attention to our official website!