Yaskawa Matrix Converter - Manual (Page 49)

Wiring Main Circuit Terminals
2-
15
Preventing Inductive Noise
As described previously, a noise filter can be used to prevent inductive noise from being generated on the out-
put side. Alternatively, cables can be routed through a grounded metal pipe to prevent inductive noise. Keep-
ing the metal pipe at least 30 cm away from the signal line considerably reduces inductive noise.
Fig 2.13 Countermeasures Against Inductive Noise
Counteracting RMS
Radio noise is generated from the MxC as well as from the input and output lines. To reduce radio noise,
install noise filters on both input and output sides, and also install the MxC in a totally enclosed steel box.
The cable between the MxC and the motor should be as short as possible.
Fig 2.14 Countermeasures Against Radio Interference
Cable Length between the MxC and Motor
If the cable between the MxC and the motor is comparatively long, the high-frequency leakage current will
increase, causing the MxC output current to increase as well. This may affect peripheral devices. To prevent
this, adjust the carrier frequency (set in C6-01, C6-02) as shown in Table 2.5 (for details, refer to Chapter 5
Parameters and Settings).
Table 2.5 Cable Length between MxC and Motor
Cable length 50 m max 100 m max More than 100 m
Carrier frequency 12 kHz max 8 kHz max 4 kHz max
IM
Power
supply
MxC
Signal line
Controller
Metal pipe
30 cm min.
IM
MCCB
Power
supply
Metal pipe
Noise
filter
Steel box
MxC
Noise
filter