Wiring accord ing to EMC
Control connections
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EDBEMV82EV EN 3.0
3.3 Control connections
This chapter describes the wiring according to EMC of the analog and digital control connections
of the function modules Standard I/O and Application I/O.
The wiring according to EMC with bus function modules is described in separate publications.
3.3.1 Basic rules for wiring
Complying with the specifications of the control cables
z
The cables of the analog and digital inputs and outputs must be shielded. If short (up to 200
mm) and unshielded cables are used, they must be twisted.
Connect the shield of the control cables correctly.
z
Continue the shield after the shield clamp to the terminals. Do not exceed an unshielded
cablelengthof40mm.
z
In case of the analog cables the shield must only be connected to the controller.
z
In unfavorable conditions (very long cable, high interferences) it is possible in case of analog
cables to connect one shield end to PE via a capacitor (e.g. 10 nF/250 V) to have a better
shielding effect (see sketch).
Fig. 7 Shielding of long, analog control cables
z
In case of digital cables the shield must be connected on both sides.
z
Further shield connection points (e.g. at terminal strips) must be selected with a minimum
distance of 50 mm to the shield connections of motor cables and DC cables.
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