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FCD300
FCD302
PROFIBUS
3
x100
1
x100
2
x100
4
x100
FCM300
1
2
3
ON
PROFIBUS
TERM.
Illustration 11: PROFIBUS Cable Connections
3.2.3 EMC Precautions
To achieve interference-free operation of the PROFIBUS, install the VLT® Decentral Drive FCD 302 and the cables as described in the
VLT® Decentral Drive FCD 302 Design Guide: When routing the PROFIBUS cable:
•
maintain high distance (minimum 200 mm (8 in)) between the PROFIBUS communication cable and the motor and brake resistor
cables to avoid coupling of high-frequency noise from one cable to another.
•
ensure that, when crossing is unavoidable, the PROFIBUS cable crosses the motor and brake resistor cables at an angle of 90° .
For installation on machines where the FCD 302 has poor electrical contact to the machine due to paint or high ohmic surface, a special
stainless steel plug and bracket exist. The order number is 175N2598.
This plug can be mounted in 1 of the unused cable entry holes and the supplied bracket has to be mounted to the plug and to the
metal construction of the machine. This ensures a low ohmic path for high-frequency noise that otherwise would have been added to
the shield of the PROFIBUS cable, causing disturbance of the communication.
NOTICE
Observe relevant national and local regulations, for example, regarding protective-earth connection.
Installation
Operating Guide | VLT® FCD 300 PROFIBUS Converter MCA 117
AQ289550754901en-000101 / 130R0890
16 | Danfoss A/S © 2019.11