Danfoss VLT 8000 AQUA Guide d'installation télécharger pdf (Page 29)

VLT® 8000 AQUA

Installation

■ 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 co

nnected to a given

master, use parallel connections.

In order to avoid potential equalizing currents in the

shield, the cable shield can be grounded via terminal

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".

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Danfoss VLT 8000 AQUA Guide d'installation Page 29