14 Chapter 3 Installation and Wiring
EV1000 Series General Purpose Variable Speed Drive User Manual
Table 3-1 Method of Noise Suppression
Noise emission paths
Actions to reduce the noise
If the external equipment shares the same
AC supply with the drive, the drive’s noise
may be transmitted along its input power
supply cables, which may cause nuisance
tripping to other external equipment.
Install noise filter at the input side of the drive, and use an isolation
transformer or line filter to prevent the noise from disturbing the external
equipment.
If the signal cables of measuring meters,
radio equipment and sensors are installed
in a cabinet together with the drive, these
equipment cables will be easily disturbed.
(1)The equipment and the signal cables should be as far away as
possible from the drive. The signal cables should be shielded and the
shielding layer should be grounded. The signal cables should be placed
inside a metal tube and should be located as far away as possible from
the input/output cables of the drive. If the signal cables must cross over
the power cables, they should be placed at right angle to one another.
(2)Install radio noise filter and linear noise filter(ferrite common-mode
choke) at the input and output sides of the drive to suppress the emission
noise of power lines.
(3)Motor cables should be placed in a tube thicker than 2mm or buried in
a cement conduit. Power cables should be placed inside a metal tube
and be grounded by shielding layer (Motor cable should be a 4-core
cable, where one core should be connected to the PE of the drive and
another should be connected to the motor’s enclosure).
If the signal cables are routed in parallel
with the power cables or bundle these
cables together, the induced
electro-magnetic noise and induced ESD
noise may disturb the signal cables.
Avoide this kind of routing. Other equipment sensibleto EMI should also
be located as far away as possible from the drive. The signal cables
should be placed inside a metal tube and should be placed as far away
as possible from the input/output cables of the drive. The signal cables
and power cables should be shielded cables. EMC interference will be
further reduced if they could be placed inside metal tubes. The clearance
between the metal tubes should be at least 20cm.
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