Omron SYSDRIVE 3G3FV User Manual page 64

Installation
Countermeasures Against Induction Noise
As described previously, a noise filter can be used to prevent induction noise from being generated on
the output side. Alternatively, cables can be routed through a grounded metal pipe to prevent induction
noise. Keeping the metal pipe at least 30 cm away from the signal line considerably reduces induction
noise.
Power
supply
Countermeasures Against Radio Interference
Radio noise is generated from the Inverter as well as the input and output lines. To reduce radio noise,
install noise filters on both input and output sides, and also install the Inverter in a totally enclosed steel
box. The cable between the Inverter and the motor should be as short as possible.
Power
supply
Cable Length between Inverter and Motor
As the cable length between the Inverter and the motor is increased, the floating capacity between the
Inverter outputs and the ground is increased proportionally. The increase in floating capacity at the In-
verter outputs causes the high-frequency leakage current to increase, and this may adversely affect
peripheral devices and the current detector in the Inverter's output section. To prevent this from occur-
ring, use a cable of no more than 100 meters between the Inverter and the motor. If the cable must be
longer than 100 meters, take measures to reduce the floating capacity by not wiring in metallic ducts, by
using a separate cable for each phase, and so on.
Also adjust the carrier frequency according to the cable length between the Inverter and the motor, as
shown in the table below.
Cable length
Carrier frequency
(Set value: C06-01)
(Set value: C06-02)
(Set value: C06-02)
2-32
3G3FV
SYSDRIVE
Signal line
Steel box
3G3FV
Noise
SYSDRIVE
filter
50 m max.
15 kHz max.
(15.0)
(15.0)
(0)
Metal pipe
30 cm min.
Controller
Metal pipe
Noise
filter
100 m max.
10 kHz max.
(10.0)
(10.0)
(0)
Chapter 2
More than 100 m
5 kHz max.
(5.0)
(5.0)
(0)