DC earth fault auto detect function on B series NASN DC power supply

The switch power supply that A series rectifier power supply A220/220-30M3, which converts AC 220V to DC 220V has a correct voltage of 119 volts between the anode bus and the PE, so there is no need to worry about any errors here.

If you measure the voltage between the negative terminal of the output terminal and the PE, there is also a voltage of 119V. Why is this design necessary? When the voltage between the anode bus and PE is equal to the voltage between the negative electrode and PE, it indicates that the machine has good DC grounding, excellent insulation and safety, and there is no problem of ground leakage. Therefore, use your current measurement method to test whether there is DC earth fault.

If additional circuit hardware is added, automatic insulation detection function can be achieved. That is B series rectifier power supply B220/220-30M3. Our B series comes with automatic insulation detection function. The A series has a manual detection function.