7-10
Installation & Connection
AC10 Inverter
7.7.2 Basic methods of suppressing the noise
Noise
emission
paths
Actions to reduce the noise
2
When the external equipment forms a loop with the drive, the equipment may
suffer nuisance tripping due to the drive’s earth leakage current. The problem
can be solved if the equipment is not grounded.
3
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. Take the following
actions to solve this problem: 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.
4,5,6
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. Take the actions below to solve the problem:
(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 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
1,7,8
Don’t route the signal cables in parallel with the power cables or bundle these
cables together because the induced electro-magnetic noise and induced
ESD noise may disturb the signal cables. Other equipment 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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