Rockwell Automation 1762-IR4 RTD/Resistance Input Module - Manual (Page 22)

Publication 1762-UM003A-EN-P - February 2003
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. RTD inputs are highly
susceptible to electrical noise. Electrical noise coupled to the RTD
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 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 wiring away from any high
voltage I/O wiring.
ATTENTION
!
Remove power before removing or inserting this
module. When you remove or insert 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
Electrical arcing causes excessive wear to contacts
on both the module and its mating connector and
may lead to premature failure.