Rockwell Automation 1762-Lxxxx MicroLogix 1200 Programmable Controllers - Manual (Page 21)

Publication 1762-UM001G-EN-P - March 2011
Install Your Controller 2-7
Other Types of Line Conditions
Occasionally the power source to the system can be temporarily interrupted. It
is also possible that the voltage level may drop substantially below the normal
line voltage range for a period of time. Both of these conditions are considered
to be a loss of power for the system.
Prevent Excessive Heat For most applications, normal convective cooling keeps the controller within
the specified operating range. Ensure that the specified temperature range is
maintained. Proper spacing of components within an enclosure is usually
sufficient for heat dissipation.
In some applications, a substantial amount of heat is produced by other
equipment inside or outside the enclosure. In this case, place blower fans
inside the enclosure to assist in air circulation and to reduce “hot spots” near
the controller.
Additional cooling provisions might be necessary when high ambient
temperatures are encountered.
TIP
Do not bring in unfiltered outside air. Place the
controller in an enclosure to protect it from a
corrosive atmosphere. Harmful contaminants or dirt
could cause improper operation or damage to
components. In extreme cases, you may need to use
air conditioning to protect against heat build-up
within the enclosure.