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INSTALLATION AND WIRING
38
3) Measures against noises which are radiated by the inverter causing misoperation of
peripheral devices.
Inverter-generated noises are largely classified into those radiated by the cables
connected to the inverter and inverter main circuit (I/O), those electromagnetically
and electrostatically inducted to the signal cables of the peripheral devices close to
the main circuit power supply, and those transmitted through the power supply
cables.
Inverter-generated
noise
Air-propagated
noise
$$$
Path 3)
$$$
Path 2)
$$$
Path 1)
$$$
Path 4), 5)
$$$
Path 6)
$$$
Path 8)
$$$
Path 7)
Magnetic induc-
tion noise
Static induction
noise
Cable Propaga-
ted noise
Noise directly radiated by
inverter
Noise radiated by power
cables
Noise radiated by motor
cables
Noise propagated through
power cables
Leakage noise from ground
cable due to leakage current
Instrument
Receiver
Inve-
rter
IM
Sensor power
supply
Motor
Telephone
Sensor
7)
2)
1)
3)
4)
5)
7)
2)
6)
3)
8)
2