PRE-INSTALLATION
2-7
Hardware
and Installation User Manual
Mount the TI525/TI535 components in a dustproof and drip tight enclosure
such
as the NEMA T
ype 12 enclosure. The enclosure must provide a minimum
depth
of 25.4 cm (10 in) 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 PLC, wiring, and components. If environmental
conditions permit, a 19-inch rack may be used instead of a NEMA enclosure.
Use
the 16-slot I/O base PPX:505–6516 for 19-inch rack installations.
2.4 GROUNDING AND WIRING THE EQUIPMENT
A good grounding system is essential for proper operation of a PLC
system and should be one of the most important considerations in
planning your installation. The structural ground present in many
industrial environments does not provide an adequate ground return where
direct
wire connection is not feasible.
Appendix B is a discussion of grounding,
electromagnetic interference (EMI), and other electrical considerations. See
the guidelines in Appendix B to be certain to meet all grounding and wiring
requirements.
2.5 TEMPERATURE CONSIDERATIONS
When preparing your installation, plan for an adequate air flow to ensure
proper
cooling of equipment. Do not permit the convective cooling of the PLC to
be hindered. Unless ambient temperatures are extremely high, a fan or
air-conditioned cooling is unnecessary for keeping TI525/TI535 PLCs below
their
maximum-rated operating temperature of 60
C.
For one local base and one distributed base located in the 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 Series 505 bases, assuming a 25C external ambient
temperature. If you must exceed these guidelines, use cooling equipment to
lower
the equipment temperature to the recommended level.
Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.comArtisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
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