5.8.5 Configuring RS485 Serial
Communication
RS485 is a 2-wire bus interface compatible with multi-drop
network topology, and it contains the following features:
•
Either Danfoss FC or Modbus RTU communication
protocol, which are internal to the drive, can be
used.
•
Functions can be programmed remotely using
the protocol software and RS485 connection or in
parameter group 8-** Communications and
Options
.
•
Selecting a specific communication protocol
changes various default parameter settings to
match the specifications of the protocol, making
more protocol-specific parameters available.
•
Option cards for the drive are available to provide
more communication protocols. See the option
card documentation for installation and operation
instructions.
•
A switch (BUS TER) is provided on the control
card for bus termination resistance. See
.
For basic serial communication set-up, perform the
following steps:
1.
Connect RS485 serial communication wiring to
terminals (+)68 and (-)69.
1a
Use shielded serial communication cable
(recommended).
1b
See
chapter 5.4 Connecting to Ground
for
proper grounding.
2.
Select the following parameter settings:
2a
Protocol type in
parameter 8-30 Protocol
.
2b
Drive address in
parameter 8-31 Address
.
2c
Baud rate in
parameter 8-32 Baud Rate
.
61
68
69
+
130BB489.10
RS485
Illustration 5.15 Serial Communication Wiring Diagram
5.8.6 Selecting Voltage/Current Input
Signal
The analog input terminals 53 and 54 allow setting of
input signal to voltage (0–10 V) or current (0/4–20 mA).
Default parameter setting:
•
Terminal 53: Speed reference signal in open loop
(see
parameter 16-61 Terminal 53 Switch Setting
).
•
Terminal 54: Feedback signal in closed loop (see
parameter 16-63 Terminal 54 Switch Setting
).
NOTICE
Disconnect power to the drive before changing switch
positions.
1.
Remove the LCP (local control panel).
See
.
2.
Remove any optional equipment covering the
switches.
3.
Set switches A53 and A54 to select the signal
type (U = voltage, I = current).
130BF146.10
BUS TER.
OFF-ON
A53 A54
U- I U- I
1
2
N O
1
2
N O
1
2
N O
1
2
N O
Illustration 5.16 Location of Terminal 53 and 54 Switches
Electrical Installation
VLT® AutomationDrive FC 361
34
Danfoss A/S © 06/2018 All rights reserved.
MG06I102
5
5
Содержание VLT AutomationDrive FC 361
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