Motor Cables - Danfoss VLT AutomationDrive FC 300 Design Manual

FC 300 Design Guide
NB!
Control cables must be screened/armoured.
Earthing of Screened/Armoured Control Cables
See section entitled
the correct termination of control cables.

6.6.7. Motor Cables

See section General Specifications
• Use a screened/armoured motor cable to comply with EMC emission specifications.
• Keep the motor cable as short as possible to reduce the noise level and leakage currents.
• Connect the motor cable screen to both the decoupling plate of the frequency converter and to the metal cabinet of the motor.
• Make the screen connections with the largest possible surface area (cable clamp). This is done by using the supplied installation devices in the
frequency converter.
• Avoid mounting with twisted screen ends (pigtails), which will spoil high frequency screening effects.
• If it is necessary to split the screen to install a motor isolator or motor relay, the screen must be continued with the lowest possible HF impedance.
6.6.8. Electrical Installation of Motor Cables
Screening of cables
Avoid installation with twisted screen ends (pigtails). They spoil the screening effect at higher frequencies.
If it is necessary to break the screen to install a motor isolator or motor contactor, the screen must be continued at the lowest possible HF impedance.
for
for correct dimensioning of motor cable cross-section and length.
MG.33.BA.02 - VLT ® is a registered Danfoss trademark
6. How to Install
130BA681.10
130BA681.10
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