FC 300 Operating Instructions
How to Install
No.
96
97
98
Motor voltage 0-100%
U
V
W
of mains voltage.
3 wires out of motor
U1
V1
W1
W2
U2
V2
6 wires out of motor, Delta-connected
U1
V1
W1
6 wires out of motor, Star-connected
U2, V2, W2 to be interconnected separately
No.
99
Earth 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 normally delta-connected
(400/690 V,
/Y). Refer to the motor name plate
for correct connection mode and voltage.
NB!:
In motors without phase insulation paper or other insulation reinforcement suitable for operation
with voltage supply (such as a frequency converter), fit an LC filter on the output of the FC 300.
Motor Cables
See chapter
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 screened/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 screen to the decoupling plate of the FC 300 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 FC 300.
•
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 high frequency impedance.
16
MG.33.A2.02 - VLT is a registered Danfoss trademark