Rockwell Automation 1761 MicroLogix 1000 Programmable Controllers - Manual (Page 31)

Installing Your Controller
1–15
Preventing Excessive Heat
For most applications, normal convective cooling keeps the controller within the
specified operating range. Ensure that the specified operating 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.
Note 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.