Basic information
2.3 Types of couplings
Direct coupling
•
Clocked modules
•
Startup of a motor
•
Differences in potential
Capacitive coupling (electric field)
•
Wires running in parallel
•
Static discharge
Inductive coupling (magnetic field)
•
Mains wires running in parallel, connected wires
•
Transformers, motors, etc.
Radiative coupling (electromagnetic field)
•
Radio transmitters (mobile telephony, citizens band radio)
•
Radio links (welding equipment)
2.4 Wiring basics
Wiring arrangement
•
Spatial separation of supply lines and signal lines
•
Always cross wires from individual categories at right angles
•
Ground unused wires on both sides
•
Lay wires along the reference surface as much as possible
•
Avoid ground loops as much as possible
•
Lay outgoing and return lines together along the entire length
•
Lay ground and power supply lines together
•
Lay cables in a metallic tray as close to the side walls as possible
Shielded lines
•
The cable shield should extend as close as possible to the end of the cable.
•
The cable shield should be grounded over as wide an area as possible.
•
The cable shield should always be grounded on both sides.
•
The cable shield should be grounded when routing into the control cabinet and again directly at the con-
nector.
Grounding
•
Good conducting connection of all conductive machine components over a wide area
•
Connection to ground potential dimensioned with sufficient strength (≥16 mm² to the control cabinet, ≥4
mm
2
to the products)
•
Centralized star-shaped grounding point (no loops)
6 Installation / EMC guide 1.36 (April 2021)
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