Rockwell Automation Publication 2080-UM005B-EN-E - March 2015 13
About Your Controller Chapter 2
Installation Considerations
Most applications require installation in an industrial enclosure (Pollution
Degree 2
(1)
) to reduce the effects of electrical interference (Over Voltage
Category II
(2)
) and environmental exposure.
Locate your controller as far as possible from power lines, load lines, and other
sources of electrical noise such as hard-contact switches, relays, and AC motor
drives. For more information on proper grounding guidelines, see the Industrial
Automation Wiring and Grounding Guidelines publication 1770-4.1
.
(1) Pollution Degree 2 is an environment where normally only non-conductive pollution occurs except that
occassionally temporary conductivity caused by condensation shall be expected.
(2) Overvoltage Category II is the load level section of the electrical distribution system. At this level, transient
voltages are controlled and do not exceed the impulse voltage capability of the products insulation.
WARNING: When used in a Class I, Division 2, hazardous location, this equipment must be mounted in a
suitable enclosure with proper wiring method that complies with the governing electrical codes.
WARNING: If you connect or disconnect the serial cable with power applied to this module or the serial
device on the other end of the cable, an electrical arc can occur. This could cause an explosion in hazardous
location installations. Be sure that power is removed or the area is nonhazardous before proceeding.
WARNING: The local programming terminal port is intended for temporary use only and must not be
connected or disconnected unless the area is assured to be nonhazardous.
WARNING: Exposure to some chemicals may degrade the sealing properties of materials used in the
Relays. It is recommended that the User periodically inspect these devices for any degradation of
properties and replace the module if degradation is found.
WARNING: If you insert or remove the plug-in module while backplane power is on, an electrical arc can
occur. This could cause an explosion in hazardous location installations. Be sure that power is removed or
the area is nonhazardous before proceeding.
WARNING: When you connect or disconnect the Removable Terminal Block (RTB) with field side power
applied, an electrical arc can occur. This could cause an explosion in hazardous location installations.
WARNING: Be sure that power is removed or the area is nonhazardous before proceeding.
ATTENTION: To comply with the CE Low Voltage Directive (LVD), this equipment must be powered from a
source compliant with the following: Safety Extra Low Voltage (SELV) or Protected Extra Low Voltage (PELV).
ATTENTION: To comply with UL restrictions, this equipment must be powered from a Class 2 source.
ATTENTION: Be careful when stripping wires. Wire fragments that fall into the controller could cause
damage. Once wiring is complete, make sure the controller is free of all metal fragments.
ATTENTION: Electrostatic discharge can damage semiconductor devices inside the module. Do not touch
the connector pins or other sensitive areas.
ATTENTION: The serial cables are not to exceed 3.0 m (9.84 ft).
ATTENTION: Do not wire more than 2 conductors on any single terminal.
ATTENTION: Do not remove the Removable Terminal Block (RTB) until power is removed.
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