Emc Precautions - Danfoss VLT Micro Drive PK18 Design Manual

RS485 Installation and Set-...

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.
8 8
Min.200mm
90° crossing
70
VLT Micro Drive Design Guide
8.1.4 Frequency Converter Parameter
The following parameters apply to the RS485 interface (FC-
port):
Parameter
8-30 Protocol
8-31 Address
8-32 Baud Rate
8-33 Parity / Stop
Bits
8-35 Minimum
Response Delay
8-36 Maximum
Response Delay
Brake resistor
®
MG02K102 - VLT is a registered Danfoss trademark
Settings for Modbus Communication
Function
Select the application protocol to run on
the RS485 interface
Set the node address. Note: The address
range depends on the protocol selected in
8-30 Protocol
Set the baud rate. Note: The default baud
rate depends on the protocol selected in
8-30 Protocol
Set the parity and number of stop bits.
Note: The default selection depends on the
protocol selected in 8-30 Protocol
Specify a minimum delay time between
receiving a request and transmitting a
response. This function is for overcoming
modem turnaround delays.
Specify a maximum delay time between
transmitting a request and receiving a
response.