ABB AC500 PLC Hardware Manual page 1187

Fig. 198: Assembly: wrong
Fig. 199: Assembly: correct
Make a connection between the DIN rails and PE (Protective Earth). For this, use an earthing
wire with a minimum conductor cross section of 10 mm².
The wire is connected to the DIN rail with an M6 screw.
A large-area contact of the DIN rail with the metallic mounting plate improves the EMC behav-
iour significantly, as the disturbances can be discharged more effective.
2.4.4.2 Cable Routing
● Route cables meeting the standards.
● Sort the cables into cable groups:
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–
–
–
2019/04/17
Overall Information (valid for complete AC500 Product Family) > EMC-Conforming Assembly and Construction
There are three important principles to be especially considered:
– Keep all connections as short as possible (in particular the earthing conduc-
tors)
– Use large conductor cross sections (in particular for the earthing conduc-
tors)
– Create low-impedance, i.e. good and large-sized contacts (in particular for
the earthing conductors)
Pay attention to the following:
– Use vibration-resistant connections
– Clean metallic contact areas
– Use solid plug and screw-type connections
– Use earth cable shields with clips on a well-grounded metallic surface
– Do not use aluminium parts
– Do not use sheath wires
– Do not use toothed lock washers under screw connections
Power current cables
Power supply cables
Signal cables
Data cables
3ADR010121, 13, en_US
System Assembly, Construction and Connection
1187