Shanghai Sigriner STEP Electric Co., Ltd.
- 154 -
Figure A-2 Schematic Diagram of Noise Propagation
A.1.3 Basic countermeasures for noise suppression
The basic countermeasures for noise suppression are shown in Table A.1.
Table A.1 Basic Countermeasures for Noise Suppression
If the signal line is wired in parallel with the
power line or bundled with the power line, the
noise will propagate along the signal line due to
electromagnetic induction and electrostatic
induction, which will cause the misoperation of
peripheral equipment.
1. Avoid parallel wiring and bundled wiring of
signal lines and power lines;
2. Keep the susceptible peripheral equipment away
from the inverter as far as possible;
3. Keep the susceptible signal lines away from the
input and output cables of the inverter as far as
possible;
4. Shielded wires are used for signal wires and
power wires, and which will have a better
performance if they are respectively sheathed
with metal tubes (the distance between metal
tubes should be at least 20cm), .
When the peripheral equipment forms a closed
loop through the wiring of the inverter, the
current leakage of grounding wire to the inverter
will cause the misoperation of peripheral
equipment.
At this time, if the peripheral equipment is not
grounded, the misoperation caused by leakage current
will be eliminated.
To Next Page
Loading...