VM1000 Series
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2.3.2 Solutions of Interfering VFD by Electromagnetic Equipment
Generally, the reason that VFD has an influence on electromagnetic is there are a large number
of relays, contactors, or electromagnetic brakes around VFD.When VFD is interfered and
malfunction, the following methods are recommended:
① Install a surge suppressor for the part that generates interference
②Install a filter at VFD intput side, refer to 2.3.5 for more details
③Use shield cables in VFD control signal line and detection cable, shielding should be well
grounded.
2.3.3 Solutions of interfering peripheral equipments by VFD
Noise in this part is classified into two kinds：One is VFD radiated interference；The other one
is VFD conducted interference. Both kinds of interference generate eletro magnetic and
electrostatic induction around the equipment, which result in equipment malfunction. Refer to
the following solutions according to various interference situations
(1)Generally the signal of meter, receiver and sensor etc for measuring is relatively
weak. If they are closed to VFD or in the same cabinet, it will cause interference and
malfunction to them easily.It is suggested to adopt the following solutions:Try to keep away
from the interference source;Do not arrange signal cable and power cable in parallel,especially,
do not tie together.Signal cable and power cable should use shield cable and ground
well;Install ferrite ring on VFD output side(suppressing frequency range from 30～1000MHz),
and coil 2 ～ 3 turns. For bad conditions, it can install an EMC output filter as option.
(2)When the equipment and VFD use same power, it will cause conducted interference. If the
solutions above can not eliminate interference, it needs to install EMC filter between VFD and
power (For model selection, refer to 2.3.5)
(3)Peripheral equipment ground independently, which can eliminate interference that caused
by leakage current of VFD ground cable when it is in common -ground.
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