FC 300 CANopen
- H o w t o I n s t a l l -
MG.33.J1.02 VER. 050301 – VLT is a registered Danfoss trademark 11
Connection of the Cable Screen
Danfoss recommends connection of the screen of the CANopen cable to ground at both ends of the cable at
every CANopen station (see Danfoss recommendation for further details). Low impedance 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
CANopen cable screen. The screen connection required for CE and EMC compliance is shown in the following
drawing.
Recommendation
The Screen must be connected to ground at only one point on the network.
NB!: Please note that this recommendation conflicts with the correct EMC installation.
Earth Connection
It is important that all stations connected to the CANopen network are connected to the same earth
potential. The earth connection must have a low HF (high frequency) impedance. This can be achieved by
connecting a large surface area of the cabinet to ground, for example by mounting the VLT frequency
converter on a conductive rear plate.
NB!:
Particularly when there are long distances between the stations in a CANopen network, it may be
necessary to use additional potential equalizing cables, connecting the individual stations to the same
earth potential.
Pin
no.
Terminal Colour Name
1 - - Reserved
2 CAN_L Blue CAN LOW
3 Drain (bare) Screen
4 CAN_H White CAN HIGH
5 - - Reserved
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