Rockwell Automation System Design for the Control of Electrical Noise - Manual (Page 35)

Publication GMC-RM001A-EN-P — July 2001
Segregating Sources and Victims 3-3
Component Categories
The table below indicates which noise zone components fall into as a
general reference for component segregation
Note: An X in multiple zones indicates that the component straddles
the two zones. Under these circumstances it is important to
position the component in the correct orientation.
Component Very-
Dirty Dirty Clean
PWM Drives/Amplifiers
1 X X X
Dynamic braking components X
External Dump Resistor (unshielded) X
External Dump Resistor (shielded)
2 X
AC Line Filter X X
Dump Resistor module (metal-clad)
2 X
Switch-mode DC power supply X
Ultrasonic Transducer
3 X
Contactors X
MCB X
Switched 24V dc loads
4
(e.g., E-stop/Piltz circuit, solenoids, relays, etc.)
X
Encoder buffer board X
PLC X
Registration 24V dc supply filter X
Dirty to Clean filter X X
Linear DC power supply X
Other 24V dc none-switched loads X
Data/Communication devices X
Analog devices X
1
The connector/terminal block locations on the drive will normally dictate the zone geometry since it
normally has connections in all categories. Design zones around the drive(s).
2
Bond chassis to the main panel or drive chassis. Refer to the chapter High Frequency (HF) Bonding for more
information.
3 Refer to the chapter Filtering Noise for more information.
4
All inductive switched loads must be suppressed. Refer to the chapter Contact Suppression for more
information.