Rockwell Automation System Design for the Control of Electrical Noise - Manual (Page 37)

Publication GMC-RM001A-EN-P — July 2001
Segregating Sources and Victims 3-5
Figure 3.3
Routing very-dirty cables
Observe the following guidelines when planning your panel layout
for very-dirty cables:
• Power cables bridge across to the drive terminals from the cable
tray on the right.
• The cable tray is bonded to the divider panel using braided strap.
If no divider panel is used, then bond cable tray to main panel.
• A divider panel is used on the right to segregate very-dirty wiring
from the clean zone of the next panel to the right.
• The divider panel is bonded with braided straps to the main panel
at top, center, and bottom.
• Use 25.4 mm (1.0 in.) wide braided strap for bonding (preferred
method). Braided strap 12.7 mm (0.5 in.) wide is acceptable.
Segregation from
clean/dirty zone
Drive power connections
(forming bridge to cable tray)
Very-Dirty Zone
(white cable tray)
Divider panel bonded with braided strap
to main panel (three places)
Clean and
Dirty Zone
Divider panel
Clean Zone
(grey wireway)
Dirty Zone
(black wireway)
PWM
Drive
PWM
Drive
PWM
Drive
PWM
Drive
Main Panel
(front view) Right Side Panel
(inside view)
Zinc plated cable tray
Cable tray bonded with
braided strap to main/
divider panel