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8.1.3 EMC Precautions
The following EMC precautions are recommended in order
to achieve interference-free operation of the RS485
network.
Relevant national and local regulations, for example
regarding protective earth connection, must be observed.
The RS485 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 200mm (8 inches) is sufficient, but keeping the
greatest possible distance between the cables is generally
recommended, especially where cables run in parallel over
long distances. When crossing is unavoidable, the RS485
cable must cross motor and brake resistor cables at an
angle of 90 degrees.
Fieldbus cable
Brake resistor
Min.200mm
90° crossing
130BC010.10
8.1.4 Frequency Converter Parameter
Settings for Modbus Communication
The following parameters apply to the RS485 interface (FC-
port):
Parameter Function
8-30 Protocol Select the application protocol to run on
the RS485 interface
8-31 Address Set the node address. Note: The address
range depends on the protocol selected in
8-30 Protocol
8-32 Baud Rate Set the baud rate. Note: The default baud
rate depends on the protocol selected in
8-30 Protocol
8-33 Parity / Stop
Bits Set the parity and number of stop bits.
Note: The default selection depends on the
protocol selected in
8-30 Protocol
8-35 Minimum
Response Delay Specify a minimum delay time between
receiving a request and transmitting a
response. This function is for overcoming
modem turnaround delays.
8-36 Maximum
Response Delay Specify a maximum delay time between
transmitting a request and receiving a
response.
RS485 Installation and Set-... VLT Micro Drive Design Guide
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