Network Connection; Rs485 Bus Termination; Emc Precautions - Danfoss VLT AQUA Drive FC 202 Design Manual

System Integration
FC
+24 V 12
+24 V 13
D IN 18
D IN 19
COM 20
D IN 27
D IN 29
D IN 32
D IN 33
D IN
37
+10 V 50
A IN
53
A IN
54
COM
55
A OUT
42
COM
39
01
02
03
04
05
RS-485
06
61
+
68
69
-
Table 3.25 RS485 Network Connection

3.8.2 Network Connection

One or more adjustable frequency drives can be connected
to a control (or master) using the RS485 standardized
interface. Terminal 68 is connected to the P signal (TX+, RX
+), while terminal 69 is connected to the N signal (TX-,RX-).
See drawings in chapter 3.5.1 Wiring Schematic.
If more than one adjustable frequency drive is connected
to a master, use parallel connections.
MG20N622
Design Guide
Parameters
Function Setting
8-30 Protocol FC*
8-31 Address 1*
8-32 Baud Rate 9600*
* = Default value
Notes/comments:
Select protocol, address and
baud rate in the above-
mentioned parameters.
D IN 37 is an option.
Danfoss A/S © 09/2014 All rights reserved.
RS 232
USB
RS 485
Figure 3.42 Parallel Connections
To avoid potential equalizing currents in the shield, wire
according to Figure 3.20.
61 68 69
Remove jumper to enable Safe Stop
12 13 18 19
Figure 3.43 Control Card Terminals

3.8.3 RS485 Bus Termination

Terminate RS485 bus with a resistor network at both ends.
For this purpose, set switch S801 on the control card to
ON.
Set the communication protocol to 8-30 Protocol.

3.8.4 EMC Precautions

The following EMC precautions are recommended to
achieve interference-free operation of the RS485 network.
Observe relevant national and local regulations, for
example, regarding protective ground connection. Keep
68 69 68 69 68 69
+
-
39 42 50 53 54 55
27 29 32 33 20 37
81
3 3