EasyDrive CV3100 Series Instruction Manual page 41

CV3100 series and MINI series high performance general purpose inverter instruction manual
(2) Basic solution against suppressing noise
Table 3-5 Solution against suppressing the interference.
Noise
transmission
path
②
③
④⑤⑥
①⑦⑧
When the grounding wire of peripheral equipment with laying
wire of inverter forms the closed loop circuit, the leakage current
of grounding wire will enable the equipment to produce false
operation. At this time, if the equipment isn't earthed, the false
operation can be avoided.
When the power supply of peripheral equipment and power
supply of inverter are provided with the same system, the noise
from inverter will transmit with inverting the power line, thus,
other equipment in the same system will be affected. The
following measures can be used to suppress the noise: Mount an
electromagnetic noise filter at input terminal of inverter; other
equipment is isolated with isolating transformer or power filter.
(1)The equipment and signal wire that is apt to be interfered
shall be kept far from the inverter. The signal wire shall be
shielded wire. The single end of shielded layer shall be earthed,
and kept away the inverter and its input/output wire as far as
possible. If the signal wire must be crossed with heavy-current
cable, they are must be kept in quadrature.
(2)The roots of input/output side of inverter are installed with
high-frequency noise filter (common mode chock of ferrite), to
suppress the radio frequency interference of power line
effectively.
(3)The cable of motor shall be put in the shield of large
thickness, if installed in the pipe of over 2mm or embedded into
cement slot, the power line shall be covered in the metallic pipe,
and the shielded wire is used to earth (The motor cable shall be
of 4 cores, one end is earthed on the side of inverter, the other is
connected to enclosure of motor ).
Avoid heavy and light current conductors being laid in parallel
or tied together, the wiring shall be kept away from the
installation equipment of inverter and input/output wire as far as
possible. The signal wire and power wire shall be the shielded
wire. The equipment with strong electric field or magnetic field
shall be kept a certain distance from the installation place of
inverter or be kept in quadrature.
Solution
3-19