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SIMATIC 545/555/575 System Manual

Installing 505 System Hardware

3.2 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, if needed to meet FCC or CE emission

standards.

• Access restricted to authorized personnel only.

• Adequate 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 a

NEMA enclosure. The enclosure must provide a minimum depth of

10 inches (254 mm) from the panel to the inside surface of the enclosure

door. The enclosure should be located so that the doors can 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 either the 11-slot PPX:505–6511 or the 16-slot

PPX:505–6516 base for 19-inch rack installations.

The SIMATIC 505/575 PLC Systems comply with the requirements of the

EMC Directive 89/336/EEC when installed in accordance with the

specifications in this manual and when installed in a grounded metal

cabinet with tightly sealed doors. If Series 505 Remote I/O channel cables to

remote bases are run outside the cabinet, they must either be run in a fully

enclosed metal raceway or fitted with ferrite beads where they leave and/or

enter the cabinets. Ferrites shall be Steward PN 28-A-2029-0 or equivalent.

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 dissipates heat.

For one local base and one remote base located in the bottom half of a 7-foot,

19-inch rack, you can place equipment that dissipates no more than 325 W

in the top half, above the Series 505 bases, assuming a 25°C external

ambient temperature. If you must exceed these guidelines, or if the base is

not installed with the vent screens at top and bottom positions, use cooling

equipment to lower the equipment temperature to the recommended level.

Enclosure Selection

Temperature

Considerations

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Siemens SIMATIC TI500 Especificaciones Pagina 58

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