Rockwell Automation 1761-HHP-B30 MicroLogix 1000 with Hand-Held Programmer (HHP) - Manual (Page 28)

Chapter 1
Installing Your Controller
1–12
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.
Important: 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.
The following figure shows the recommended minimum spacing for the
controller. (Refer to appendix A for controller dimensions.)
20142
B
A
A. Greater than or equal to 50.8 mm (2 in.).
B. Greater than or equal to 50.8 mm (2 in.).
B
A
Top
Bottom
Side Side
This equipment is suitable for Class I, Division 2, Groups A, B, C, D or
non-hazardous locations only, when product or packaging is marked.
!
ATTENTION – Explosion Hazard:
•
Substitution of components may impair suitability for Class I,
Division 2.
•
This product must be installed in an enclosure. All cables
connected to the product must remain in the enclosure or be
protected by conduit or other means.
The controller should be mounted horizontally within an enclosure, using a
DIN rail or mounting screws. Copy the template from page A–8 to help you
space and mount the controller properly.
Preventing Excessive Heat
Controller Spacing
Mounting the Controller