Operating instructions

2.1.4. Connection of the Cable Screen
Danfoss recommends connection of the screen of the DeviceNet cable to ground at both ends of
the cable at every DeviceNet station (see Danfoss recommendation for further details). Low im-
pedance ground connection of the screen is very important, also at high frequencies. Achieve this
by connecting the surface of the screen to ground, for example by means of a cable clamp or a
conductive cable gland. The frequency converter package includes various clamps and brackets
to enable a proper ground connection of the DeviceNet cable screen. The screen connection re-
quired for CE and EMC compliance is shown in the following drawing.
2.1.5. ODVA Recommendation
The Screen must be connected to ground at
only one point on the network.
NB!
Please note that this recommen-
dation conflicts with the correct
EMC installation.
2.1.6. Earth Connection
It is important that all stations connected to
the DeviceNet network are connected to the
same earth potential. The earth connection
must have a low HF (high frequency) impe-
dance. This can be achieved by connecting a
large surface area of the cabinet to ground,
for example by mounting the frequency con-
verter on a conductive rear plate.
NB!
Particularly when there are long
distances between the stations
in a DeviceNet network, it may
be necessary to use additional
potential equalizing cables, con-
necting the individual stations to
the same earth potential.
Pin no. Termi-
nal
Colour Name
1 V- Black GND
2 CAN_L Blue CAN
LOW
3 Drain (bare) Screen
4 CAN_H White CAN
HIGH
5 V+ Red +24 V
FC 100/ 200/ 300 DeviceNet 2. How to Install
MG.33.D3.02 - VLT
®
is a registered Danfoss trademark 15
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