Noise Suppression - Emerson EV1000-2S0004G User Manual

10 Chapter 3 Installation and Wiring

3.1.2 Noise Suppression

The noise generated by the drive may disturb the equipment nearby. The degree of disturbance is dependent on the drive
system, immunity of the equipment, wire connections, installation clearance and earthing methods.
Noise emission paths
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.
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.
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.
10kV
Isolation
Transformer
>20cm
power
source cable
of meters
PLC or
Metal
meters
cabinet
control cable
Figure 3-5 Installation of the drive
Table 3-1 Method of Noise Suppression
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.
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) .
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.
EV1000 Series General Purpose Variable Speed Drive User Manual
Power
Transformer
Power
source
cable of
inverter
filter
circuit breaker
>30cm
AC input reactor
Drive
motor cable
>50cm
AC Output
reactor
Actions to reduce the noise
metal
cabinet
Motor