Strain Relief; Ethernet Commissioning And Cabling; General Cabling Instructions For Ethernet; Grounding The Cable Shield - Danfoss VACON 100 INDUSTRIAL Operating Manual

Operating Guide | VACON® 100 Wall-mounted Drives

7.4.3.2 Strain Relief

If there is a possibility of tensile load on the cable, install it with a strain relief. When it is possible, the strain relief of the fieldbus cables
should not be done at the shield connection to ground. This may reduce the effectiveness of the bonding. The tensile load and
vibration can also damage the shield.

7.4.4 Ethernet Commissioning and Cabling

7.4.4.1 General Cabling Instructions for Ethernet

Use only shielded cables of category CAT5e or CAT6.
Table 19: The Recommended Cable Shielding
Recommendation order
1
2
3
4
Use standard Ethernet 100 Mbit pinout connectors. The plug type to be used is a shielded RJ45 plug, maximum length 40 mm (1.57 in).
The maximum length of the CAT5e or CAT6 cable between two RJ45 ports is 100 meters. You can get cables that have a certain length,
or get cable in bulk and assemble the connectors at commissioning. Obey the instructions of the manufacturer if you assemble the
connectors manually. If you make the cables by yourself, be sure to select correct crimp tools and use precaution. The individual
contacts of the RJ45 socket are allocated as per the T568-B standard.
In basic use, it is important that the RJ45 connectors in the cable (or the ones assembled) connect the cable shield to the ground level
of the Ethernet terminal in the AC drive.

7.4.4.2 Grounding the Cable Shield

Equipotential bonding refers to using metal parts to make ground potential everywhere in the installation the same, the system
ground. If the ground potential of all the devices is the same, you can prevent current from flowing through paths that are not
designed to have current. You can also shield cables efficiently.
An error in the equipotential bonding can cause bad quality or malfunction of the fieldbus communication. It is not easy to find an
error in equipotential bonding. It is also not easy to correct errors in large installations after commissioning. Thus, in the planning
phase it is important to plan the installation to get good equipotential bonding. In the commissioning phase, make the equipotential
bonding connections carefully.
Do grounding with low HF impedance, for example, via backplane mounting. If ground connection wires are necessary, use wires that
are as short as possible. Paint coating acts as an insulator on metal and prevents grounding. Remove paint coating before doing
grounding.
When equipotential bonding is good, the RJ45 connectors in the cable (or the ones assembled) must connect the cable shield to the
ground level of the Ethernet terminal in the AC drive. The cable shield can be connected to the ground level at both ends via the built-
in RC circuit (illustration 29). This grounds the disturbances and, to some degree, prevents current from flowing in the cable shield. To
do this, use shielded Ethernet cable (S/FTP or STP) which grounds devices via a RJ45 connector and thus uses a built-in drive RC circuit.
Danfoss A/S © 2019.05
Cable
Shielded and Foiled Twisted Pair (S/FTP) CAT5e or CAT6
Shielded Twisted Pair (STP) CAT5e or CAT6
Foiled Twisted Pair (FTP) CAT5e or CAT6
Unshielded Twisted Pair (UTP) CAT5e or CAT6
Control Unit
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