FR200 Series Vector control inverter
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equipment via ground loop. Such a leakage current may result in malfunction of RCD and other
equipment. The higher the carrier frequency of drive is, the bigger the ground leakage current would
be. The longer the motor cables and the bigger the parasitic capacitances are, the bigger the ground
leakage current would be. Therefore, the most immediate and effective method for suppression of
ground leakage current is to reduce carrier frequency and minimize the length of motor cables.
The higher harmonics of line-to-line leakage current that pass through between cables at output
side of drive will Accel the aging of cables and may bring about malfunction of other equipment. The
higher the carrier frequency of drive is, the bigger the line-to-line leakage current would be. The longer
the motor cables and the bigger the parasitic capacitances are, the bigger the line-to-line leakage
current would be. Therefore, the most immediate and effective method for suppression of ground
leakage current is to reduce carrier frequency and minimize the length of motor cable. Line-to-line
leakage current can also be effectively suppressed by mounting additional output reactors.
3.9.4 Use of Power Supply Filter
Since AC drives may generate strong interference and are also sensitive to outside interference,
power supply filters are recommended. Pay close attention to the following instructions during the use:
Enclosure of the filter needs to be reliably grounded;
Input lines of the filter shall be kept as far away from output lines as possible so as to avoid mutual
coupling;
Filter shall be as close to the drive side as possible;
Filter and drive must be connected to the same common ground.
