Micromod MOD: Remote I/O Modules for use with 2020N Remote I/O Interface Module - Manual (Page 14)

Remote I/O Modules
ELECTRICAL CONNECTIONS
3.3 GROUND CONNECTIONS
All products in a cabinet must be connected to the same earth. When the remote units are
outside the cabinet, they must be connected to the nearest earth. The connection to the
earth has to be as short as possible (shorter than 25 cm).
Ground concept with different cabinets
• The capacitor is integrated in the plug-in base.
• When the cabinets are close to each other, the different earths have to be connected
together with a cable with a cross section of at least 16 mm2.
• The noisy elements (drives, motors, ...) do not have to be connected to the earth
between two cabinets.
• The connection to the earth has to be near the noisier element.
• In a noisy environment, use an isolated transformer with a shield in each cabinet (even
for 24 VDC version).
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