Network Connection; Rs485 Bus Termination - Danfoss VLT Refrigeration Drive FC 103 Design Manual

System Integration
FC
+24 V 12
+24 V 13
D IN 18
3 3
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
06
61
68
69
Table 3.23 RS485 Network Connection
72
®
VLT Refrigeration Drive FC 103
Parameters
Function Setting
Parameter 8-30 P
rotocol FC*
Parameter 8-31 A 1*
ddress
Parameter 8-32 B 9600*
aud Rate
* = Default value
Notes/comments:
Select protocol, address, and
baud rate in the above
mentioned parameters.
D IN 37 is an option.
RS-485
+
-
Danfoss A/S © 08/2015 All rights reserved.

3.9.2 Network Connection

One or more frequency converters can be connected to a
control (or master) using the RS485 standardised 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 3.6.1 Wiring Schematic.
If more than 1 frequency converter is connected to a
master, use parallel connections.
RS 232
USB
RS 485
Illustration 3.42 Parallel Connections
To avoid potential equalising currents in the screen, wire
according to Illustration 3.24.
61 68 69
Remove jumper to enable Safe Stop
12 13 18 19
Illustration 3.43 Control Card Terminals

3.9.3 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 parameter 8-30 Protocol.
68 69 68 69 68 69
+
-
39 42 50 53 54 55
27 29 32
33 20 37
MG16G202