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APPENDIX 9    EMC INSTALLATION GUIDELINES 
Appendix 9.4    Panel Structure 
 
 
I - 109 
Appendix 9.4.3    Countermeasures for power supply 
 
(1)  Shield the power supply section and insert a filter to prevent the noise from flowing in or out. 
Selection of the noise filter capacity will differ according to the drive amplifier and devices being 
used. 
Refer to the "EMC Installation Guidelines" NC Servo Amplifier Section [BNP-B8582-45]. 
 
 
Device
 
Radiated noise 
Flow out 
(Fig.1)
 
NF 
Partition 
plate 
AC input
(Fig.2)
AC input
Conductive 
noise
 
NF 
Noise 
filter
 
Noise 
filter 
Device
Radiated noise 
Conductive
noise 
 
 
 
[CAUTION] 
•  The conductive noise can be suppressed just by inserting a noise filter, but the radiated 
noise will flow out. (Fig. 1) 
•  The conductive and radiated noise can both be suppressed by adding a partition plate to 
the noise filter. (Fig. 2)