Danfoss VLT 4000 ME Manual page 38

■ Bus connection
The serial bus connection in accordance with the RS
485 (2-conductor) norm is connected to terminals
68/69 of the AFD (signals P and N). Signal P is
the positive potential (TX+,RX+), while signal N
is the negative potential (TX-,RX-).
If more than one AFD is to be connected to a given
master, use parallel connections.
50
VLT® 4000 VT
In order to avoid potential equalizing currents in the
screen, the cable screen can be grounded via termi-nal
61, which is connected to the frame via an RC-link.
Bus termination
The bus must be terminated by a resistor network
at both ends. For this purpose, set switches 2
and 3 on the control card for "ON".
MG.40.A4.22 - VLT is a registered Danfoss trademark