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5
Installation
of Electro-Magnetic Interference (EMI). A foil shield is the most effective way to
minimize Radio Frequency Interference (RFI).
A cable that provides both types of shielding is preferred, however, a braided shield
alone will usually provide adequate protection. To reduce chances of ground loops,
shields should be grounded only on one end, preferably at the signal source.
Selecting An Enclosure
The Emerson Motion Control 525 PMC is designed for the industrial environment.
However, no sophisticated electronic system can tolerate certain atmospheric
contaminants such as moisture, oils, conductive dust, chemical contaminants and
metallic particles. Therefore, if the 525 PMC is going to be subjected to this type of
environment, it must be back mounted verticality in a metal NEMA type 12
enclosure. Proper ventilation and filtering must also be provided. If the equipment
environment is above 80 F, cooling should be considered.
Enclosure Size
The size of the enclosure will determine how long it takes the temperature inside to
rise. It will also affect the thermal transfer of the enclosure. Normally, the larger
the enclosure the better the thermal transfer. Thermal transfer is also affected by
venting, forced air cooling, and the enclosure material.