Hardware connections
Manual – ECC-DFC field bus controller
4.4.3. Grounding of the current supply
Regardless of whether the logic and the motor rollers have a shared or a sepa-
rate current supply, the DC supply ground connections (“-”) must be connected.
One of the two current supplies must have a grounded DC connection. Direct
ground connection of more than one current supply DC connection must be
avoided, since this can lead to unintentional ground loops. Figures 12 and 13
show a single and a separate current supply and their DC supply ground and
grounding connections.
Figure 12 Single current supply with combined DC supply ground and grounding connections
Figure 13 Double current supply with combined DC supply ground and grounding connections
NOTICE!
This document assumes that the user knows the power requirements of the mo-
tor rollers for the relevant application and that the DC 24 V current supplies and
the wiring are correctly dimensioned on the basis of the applicable directives and
standards. It is also assumed that the devices are correctly grounded during in-
stallation. The DC current supply ground or “-” must always be grounded at all
current supply units. Incorrect dimensioning of the current supply and/or incor-
rect grounding can have unexpected results.
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