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4.3.1.2 Noise transmission path
Fig. 4-25 Noise transmission path
4.3.1.3 Basic measures for noise suppression
Table 4-7 Measures for noise suppression
Measures to reduce influence
If the external devices form a closed loop through the drive wiring, the leakage current of the
grounding cable may cause misoperation of relevant devices. The misoperation can be reduced if
you remove the grounding.
When the external devices and drive share the same power system, the noise generated by the drive
will transmit along the power cable in a reverse direction, causing misoperation of other devices in
the system. Take the following measures: installing the noise filter at the input end of the drive, and
isolating the noise for other devices using an isolation transformer or power filter.
If the devices (for processing weak signals of measuring instruments, radio devices and sensors) and
their signal cables are installed in the same cabinet with the drive, and the wiring is very close, then
misoperation may occur due to space noise. Take the following measures:
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