Rockwell Automation 1747-L40 SLC 500 Fixed Hardware Style - Manual (Page 41)

Chapter 2
System Installation Recommendations
2–2
Follow the recommended minimum spacing shown below to allow for
convection cooling within the enclosure. Air in the enclosure must be kept
within a range of 0
°
to +60
°
C (+32
°
to +140
°
F).
Important: Be careful of metal chips when drilling mounting holes for the
controllers. Do not drill holes above a mounted SLC 500
controller. Metal chips or clippings may short circuit electronic
components of the controller and cause intermittent or
permanent malfunction.
Greater than 101.6 mm
(4 inches)
Enclosure
Greater than 152.4 mm (6 inches)
Greater than 152.4 mm (6 inches)
Greater than 101.6 mm
(4 inches)
For most applications, normal convection cooling will keep the controller
components within the specified operating range. Proper spacing of
components within the 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.
Important: Do not bring in unfiltered outside air. It may introduce harmful
contaminants of dirt that 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.
Spacing Your Components
Preventing Excessive Heat