RS-485 Bus Connection
One or more frequency converters can be connected
to a controller (or master) using the RS-485 standard
interface. Terminal 68 is connected to the P signal (TX
+, RX+), while terminal 69 is connected to the N signal
(TX-,RX-).
If more than one frequency converter is connected to
a master, use parallel connections.
Figure 5. 1: Connection example.
In order to avoid potential equalizing currents in the screen, earth the cable screen via terminal 61, which is
connected to the frame via an RC-link.
Bus termination
The RS-485 bus must be terminated by a resistor network at both ends. If the drive is the first or the last device
in the RS-485 loop, set the switch S801 on the control card for ON.
For more information, see the paragraph
Switches S201, S202, and S801
.
How to Operate the Frequency Converter
5-8 BAS-SVX19C-EN
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