Parameters
FC
+24 V
+24 V
D IN
D IN
D IN
COM
D IN
D IN
D IN
D IN
+10
A IN
A IN
COM
A OUT
COM
R1R2
12
13
18
19
20
27
29
32
33
37
50
53
54
55
42
39
01
02
03
04
05
06
-
61
68
69
RS-485
+
130BB685.10
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.
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.
130BA060.11
68 69 68 69 68 69
RS 485
RS 232
USB
+
-
Figure 3.42 Parallel Connections
To avoid potential equalizing currents in the shield, wire
according to Figure 3.20.
130BB021.10
12 13 18 19 27 29 32
33 20 37
Remove jumper to enable Safe Stop
61 68 69 39 42 50 53 54 55
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
System Integration
Design Guide
MG20N622 Danfoss A/S © 09/2014 All rights reserved. 81
3 3
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