2-6
Pre-installation Guidelines
TI545/TI555 System Manual
2.3
Enclosure and Temperature Considerations
An enclosure should provide the following features:
•
Easy access to components.
•
A common ground potential on the cabinet.
•
A secure vertical panel or rails.
•
Conformance to electrical standards.
•
An electromagnetic shield.
•
Access restricted to authorized personnel only.
•
Cooling and heat dissipation.
•
Protection from dust and dirt as required by the environment.
Mount the components in a dustproof and drip tight enclosure such as the
NEMA Type enclosure. The enclosure must provide a minimum depth of
10 in. (25.4 cm) from the panel to the inside surface of the enclosure door.
The enclosure should be located so that the doors may be opened fully,
permitting easy access to the controller, wiring, and components. If
environmental conditions permit, a 19-inch rack may be used instead of a
NEMA enclosure. Use the 16-slot PPX:505–6516 I/O base for 19-inch rack
installations.
When preparing your installation, plan for an adequate air flow to ensure
proper cooling of equipment. Do not permit the convection cooling of the
controller to be hindered. Unless ambient temperatures are extremely high,
a fan or air-conditioned cooling is unnecessary for keeping controllers below
their maximum-rated operating temperature of 60
°
C provided that the
cabinet adequately dissipate heat.
For one local base and one remote base located in the bottom half of a 7-foot,
19-inch rack, place equipment that dissipates no more than 325 W in the
top half, above the System 505 bases, assuming a 25
°
C external ambient
temperature. If you must exceed these guidelines, use cooling equipment to
lower the equipment temperature to the recommended level.
Enclosure Selection
Temperature
Considerations