36 Rockwell Automation Publication 2080-UM002G-EN-E - March 2015
Chapter 4 Wire Your Controller
• Route incoming power to the controller by a path separate from the device
wiring. Where paths must cross, their intersection should be
perpendicular.
• Separate wiring by signal type. Bundle wiring with similar electrical
characteristics together.
• Separate input wiring from output wiring.
• Label wiring to all devices in the system. Use tape, shrink-tubing, or other
dependable means for labeling purposes. In addition to labeling, use
colored insulation to identify wiring based on signal characteristics. For
example, you may use blue for DC wiring and red for AC wiring.
Use Surge Suppressors
Because of the potentially high current surges that occur when switching
inductive load devices, such as motor starters and solenoids, the use of some type
of surge suppression to protect and extend the operating life of the controllers
output contacts is required. Switching inductive loads without surge suppression
can significantly reduce the life expectancy of relay contacts. By adding a
suppression device directly across the coil of an inductive device, you prolong the
life of the output or relay contacts. You also reduce the effects of voltage
transients and electrical noise from radiating into adjacent systems.
Do not run signal or communications wiring and power wiring in the
same conduit. Wires with different signal characteristics should be
routed by separate paths.
Wire Requirements
Wire Size
Type Min Max
Micro830/
Micro850
Controllers
Solid 0.2 mm
2
(24 AWG) 2.5 mm
2
(12 AWG) rated @ 90 °C (194 °F)
insulation max
Stranded 0.2 mm
2
(24 AWG) 2.5 mm
2
(12 AWG)
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