FC 300 Design Guide
How to Install
No. 96 97 98 Motor voltage 0-100%
U V W of AC line voltage.
3 wires out of motor
U1 V1 W1
W2 U2 V2
6 wires out of m otor, Delta connected
U1 V1 W1 6 wires out of motor, Star connected
U2, V2, W2 to be interconnected separately
(optionalterminalblock)
No. 99 Ground connection
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).Refertothemotornameplateforcorrect
connection mode and voltage.
NOTE
In motors without phase insulation paper or other insulation reinforcement suitable for operation with
voltage supply (such as an adjusta ble frequency drive), fit an LC filter on the output of the FC 300.
" Motor Cables
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 compl y 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 leakag e 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 3 00.
• Avoid mounting with twisted shield ends (pigtails), which will spoil high freq ue n cy shie lding 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 .
89
MG.33.B3.22 - VLT is a registered Danfoss trademark
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