Danfoss VLT AutomationDrive FC 301 Installation Manual - Page 9

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Installation

3.3 EMC-compliant Installation

To obtain an EMC-compliant installation, follow the

instructions provided in the relevant frequency converter

Operating Instructions and Design Guide. Refer to the

fieldbus master manual from the PLC supplier for further

installation guidelines.

•

Ensure that all stations connected to the fieldbus

network are connected to the same ground

potential. When there are long distances between

the stations in a fieldbus network, connect the

individual station to the same ground potential.

Install equalising cables between the system

components.

•

Establish a grounding connection with low HF

impedance, for example by mounting the

frequency converter on a conductive back plate.

•

Keep the ground wire connections as short as

possible.

NOTICE

EMC INTERFERENCE

Use screened cables for motor and control wiring, and

separate cables for fieldbus communication, motor

wiring, and brake resistor. Failure to isolate fieldbus

communication, motor, and brake resistor cables can

result in unintended behaviour or reduced performance.

Minimum 200 mm (7.9 in) clearance between power,

motor, and control cables is required. For power sizes

above 315 kW, it is recommended to increase the

minimum distance of 500 mm (20 in).

NOTICE

When the fieldbus cable crosses a motor cable or a brake

resistor cable, ensure that the cables cross at an angle of

90°.

MG90U402

Installation Guide

Illustration 3.4 Cable Routing

≥ 200mm

Ethernet cable

90° crossing