Rockwell Automation 1762-IT4 Thermocouple/mV Input Module - Manual (Page 20)

Publication 1762-UM002A-EN-P - July 2002
2-4 Installation and Wiring
Remove Power
Selecting a Location
Reducing Noise
Most applications require installation in an industrial enclosure to
reduce the effects of electrical interference. Analog inputs are highly
susceptible to electrical noise. Electrical noise coupled to the analog
inputs will reduce the performance (accuracy) of the module.
Group your modules to minimize adverse effects from radiated
electrical noise and heat. Consider the following conditions when
selecting a location for the analog module. Position the module:
•
away from sources of electrical noise such as hard-contact
switches, relays, and AC motor drives
•
away from modules which generate significant radiated heat.
Refer to the module’s heat dissipation specification.
In addition, route shielded, twisted-pair analog input wiring away
from any high voltage I/O wiring.
ATTENTION
!
Remove power before removing or installing this
module. When you remove or install a module with
power applied, an electrical arc may occur. An
electrical arc can cause personal injury or property
damage by:
•
sending an erroneous signal to your system’s
field devices, causing unintended machine
motion
•
causing an explosion in a hazardous
environment
•
causing permanent damage to the module’s
circuitry
Electrical arcing causes excessive wear to contacts
on both the module and its mating connector. Worn
contacts may create electrical resistance.