Danfoss VLT 8000 AQUA Istruzioni per gli Interventi Scaricare il pdf (Pagina 82)

VLT

8000 AQUA

■ Bus connection

The serial bus connection in accordance with the RS

485 (2-conductor) norm is connected to terminals

68/69 of the frequency converter (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 frequency converter is to be connected

to a given master, use parallel connections.

In order to avoid potential equalizing currents in the

screen, the cable screen can be earthed 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".

MG.83.A2.02 - VLT is a registered Danfoss trademark

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Danfoss VLT 8000 AQUA Istruzioni per gli Interventi Pagina 82