6
Electrical installation
Installation planning taking EMC aspects into account
Manual – PROFINET IO Interfaces, Field Distributors
40
6.1.4
Cable glands
•
Select only cable glands with a shield connected over a large area. Observe the
notes regarding the selection of the cable glands.
6.1.5
Cable shields
•
Must have good EMC properties (high screening attenuation).
•
It must protect the cable mechanically and serve as shielding.
•
Must be connected to a wide area of the device's metal housing at the cable ends
(via EMC metal cable glands). Also observe the further notes regarding the selec-
tion of the cable glands.
Additional information is available in the SEW‑EURODRIVE document
"Drive Engin-
eering – Practical Implementation, EMC in Drive Engineering."
6.1.6
Example for connection of the MF../MQ.. fieldbus interface and MOVIMOT
®
If the MF../MQ.. fieldbus interface and MOVIMOT
®
are installed separately, the RS485
connection must be implemented as follows:
•
Carrying the DC 24 V supply
– Use shielded cables.
– Connect the shield to the housing of both devices using EMC cable glands.
– Twist the conductors in pairs as shown in the following figure.
RS+
RS-
24V
GND
RS+
GND
24V
RS-
1138904075
•
Without carrying the DC 24 V supply
If the MOVIMOT
®
drive is supplied with DC 24 V via a separate connection, the
RS485 connection must be carried out as follows:
– Use shielded cables.
– Connect the shield to the housing of both units using EMC cable glands. Also
observe the further notes regarding the selection of the cable glands.
– Generally provide the GND reference potential.
– Twist the conductors as shown in the following figure.
RS+
RS-
GND
1138973579
22870857/EN – 12/2016