Rockwell Automation System Design for the Control of Electrical Noise - Manual (Page 49)

Publication GMC-RM001A-EN-P — July 2001
Filtering Noise 5-3
Figure 5.3
Floating-Common filter
The table below lists the part description and part numbers for the
filters shown in Figure 5.2 and Figure 5.3.
1
Capacitor value is not critical, but it must be a ceramic type.
2
The ferrite specification is not critical, but choose a low frequency type if possible.
3
Alternative ferrite sleeve part numbers: Palomar (FB-102-43) or Schafner (2644665702)
Note: For more information regarding part vendors refer to Appendix B.
Filter Performance The theoretical attenuation of one stage and two stage filters is shown
in the table below.
Capacitors
Ferrite Sleeve
(choke)
Dirty side
Clean side
DIN rail
Forming capacitor leads
Part Description RS Components
Part Number Newark
Part Number
Ground Terminal (1 in, 2 out type) 225-4372 N/A
Insulated Terminal (1 in, 2 out type) 426-193 N/A
1
µ
F, 50V Ceramic Capacitor
1 211-5558 29F025
Small Ferrite Sleeve
2
239-056
3 91F6484
With this filter: Attenuation @ 1M Hz is:
1 stage (2.8k Hz) 55 dB
2 stage (1.2k Hz 110 dB