Motor Cables - Danfoss VLT AutomationDrive FC 300 Design Manual

FC 300 Design Guide
No. 96
U
U1
W2
U1
No. 99
PE
All types of three-phase asynchronous standard
motors can be connected to the FC 300. Normally,
small motors are star-connected (230/400 V, ∆/
Y). Large motors are delta-connected (400/690 V,
∆/ Y). Refer to the motor nameplate for correct
connection mode and voltage.
NOTE
In motors without phase insulation paper or other insulation reinforcement suitable for operation with
voltage supply (such as an adjustable frequency drive), fit an LC filter on the output of the FC 300.

Motor Cables

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See section General Specifications for correct dimensioning of motor cable cross-section and length.
Always comply with national and local regulations on cable cross-section.
Use a shielded/armored motor cable to comply with EMC emission specifications
•
unless otherwise stated for the RFI filter used.
Keep the motor cable as short as possible to reduce the noise level and leakage currents.
•
Connect the motor cable shield to the grounding plate of the FC 300 and to the metal cabinet of the motor.
•
Make the shield connections with the largest possible surface area (cable clamp). This is
•
done by using the supplied installation devices in the FC 300.
Avoid mounting with twisted shield ends (pigtails), which will spoil high frequency shielding effects.
•
• If it is necessary to split the shield to install a motor isolator or motor relay, the shield
must be continued with the lowest possible HF impedance.
How to Install
97 98 Motor voltage 0-100%
V W of AC line voltage.
3 wires out of motor
V1 W1
6 wires out of motor, Delta connected
U2 V2
V1 W1 6 wires out of motor, Star connected
U2, V2, W2 to be interconnected separately
(optional terminal block)
Ground connection
MG.33.B3.22 - VLT is a registered Danfoss trademark
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