Emotron VSB Instruction Manual Chapter 3 Installation and wiring
the carrier frequency. Leakage current is classified into ground leakage current and line-to-line
leakage current.
Ground leakage current not only circulates inside drive system, but may also influence other
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 capacitance 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 passes 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 capacitance 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.
3.11.4 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.
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