Motor Cables - Danfoss FC 300 Instruction Manual

FC 300 Instruction Manual
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 normally 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 adjustable frequency drive), fit an LC filter on the output of the FC 300.

Motor cables

"
See Technical data for correct sizing of motor cable cross-section and length. Always comply
with national and local regulations on cable cross-section.
• Use a shielded/armoured 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 decoupling 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 screen ends (pigtails), which will spoil high frequency screening 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.
20
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
Ground connection
MG.33.A6.22 - VLT is a registered Danfoss trademark