SVF-G7 Series Frequency Inverter Operation Manual
Chapter 9 EMC
191
There are two kind of the part noise: one is the radiation interference,
and the other one is the conducted interference of the drive. Two kinds
interference make the around equipments being induced by electrimagnetic
or electrostatic. Then the devices have malfunctions. For several different
kinds of interference, refer to the following methods to solve:
A. Generally the signals of instruments, receivers, sensors and other for
measuring are weak , if they are close to the drive or in the same
cabinet with drive, the devices will be vulnerable to interference and
malfunction, so propose the following solution: try to stay away from
Interference source; do not make signal lines and power lines parallel
arranging, especially
parallel banding together; signal lines and
power lines use shielded cables, and is properly grounded; install the
ferrite bead (select the suppression frequency's range in 30~1000MHz),
in the output side of drive and around 2 to 3 turns, in the case of
bad, can choose EMC output filter;
B. When disturbed devices and the drive use the same power, resulting in
conducted interference, if the above methods can not eliminate the
interference, EMC filter should be installed between the drive and
power ( please refers to 9.3.6 about selection of the type);
C. Peripherals ground alone, can rule out when common ground to generate
interference for the drive's ground wire having leakage.
9.3.5
9.3.5
9.3.5
9.3.5 Leakage
Leakage
Leakage
Leakage current
current
current
current and
and
and
and its
its
its
its processing
processing
processing
processing
system
system
system
system
When use drive, there are two kinds of leakage current: one is the leakage
current to ground; the other is the leakage current between line and line.
A. Influencing factors of the earth leakage current and solutions:
There is distributing capacitance between the conductor and the earth,
the distributing capacitance is greater, leakage current increases;
reduce the distance between the drive and motor to effectively reduce
