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6. TROUBLESHOOTING
6-8
6.3 Noise Malfunctions and Measures
Drive unit-generated noises are largely classified into those radiated by the cables connected to the
drive unit and drive unit's main circuit (I/O), those electromagnetically and electrostatically induced
to the signal cables of the peripheral devices close to the main circuit cables, and those transmitted
through the power supply cables. When the drive unit malfunctions due to peripheral noises, noises
also enter in a similar propagation paths.
(1) Noise types and propagation paths
Path 8)
Drive unit-generated
noise
Air-propagated
noise
Magnetic induction
noise
Static induction
noise
Cable-propagated
noise
Path 4), 5)
Path 6)
Noise directly radiated
by drive unit
Noise radiated by power
cables
Noise radiated by motor
cables
Noise propagated through
power cables
Noise from ground cable
due to leakage current
Path 1)
Path 2)
Path 3)
Path 7)
M
5)
7)
2)
1)
3)
4)
6)
2)
3)
7)
8)
Telephone
Instrument
Receiver
Drive unit
Motor
Sensor
Sensor power
supply