Danfoss VLT AQUA Drive Design Manual page 125

VLT ® AQUA Drive Design Guide
7.1.4. VLT AQUA Parameter Settings for Modbus Communication
The following parameters apply to the RS-485 interface (FC-port):
Parameter
ber
8-30
8-31
8-32
8-33
8-35
8-36
8-37
7.1.5. EMC Precautions
The following EMC precautions are recommended in order to achieve interference-free operation
of the RS-485 network.
Num- Parameter name
Protocol
Address
Baud Rate
PC port parity/Stop
bits
Min. response delay Specify a minimum delay time between receiving
Max. response delay Specify a maximum delay time between trans-
Max. inter-char delay Specify a maximum delay time between two re-
NOTE
Relevant national and local regulations, for example, regarding protective ground
connection, must be observed. The RS-485 communication cable must be kept away
from motor and brake resistor cables to avoid coupling of high frequency noise from
one cable to another. Normally a distance of 200 mm (8 inches) is sufficient, but
keeping the greatest possible distance between the cables is generally recommen-
ded, especially where cables run in parallel over long distances. When crossing is
unavoidable, the RS-485 cable must cross motor and brake resistor cables at an
angle of 90 degrees.
MG.20.N2.22 - VLT ® is a registered Danfoss trademark.
7. RS-485 Installation and Set-up
Function
Select the application protocol to run on the
RS-485 interface
Set the node address. Note: The address range
depends on the protocol selected in par. 8-30
Set the baud rate. Note: The default baud rate
depends on the protocol selected in par. 8-30
Set the parity and number of stop bits. Note: The
default selection depends on the protocol selec-
ted in par. 8-30
a request and transmitting a response. This can
be used for overcoming modem turnaround de-
lays.
mitting a request and receiving a response.
ceived bytes to ensure timeout if transmission is
interrupted.
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