FC 300 Design Guide
FC 300 Selection
" IP 21/IP 4X/ TYPE 1 (NEMA 1) Enclosure Kit
IP 20/IP 4 X top/ TYPE 1 (NEMA 1) is an optional enclosure element available for IP 20 Compact units.
I
f the enclosure kit is used, an IP 20 unit is upgraded to comp ly with enclosure IP 21 / 4X top/TYPE 1 (NEMA 1).
The IP 4X top c an be applied to all standard IP 20 FC 30X variants.
" IP21/Type1EnclosureKit
A-Topcover
B-Brim
C-Basepart
D - Base cover
E-Screw(s)
Place the top cover as shown. If an A or B option is
used the brim must be fitted to cover the top inlet.
Place the base part C at the bottom of the drive and
use the clamps from the accessory bag to correctly
fasten the cables. Holes for cable glands:
Size A2: 2x PG16 (½") 3xPG21 (3/4")
Size A3: 3xPG16 (½") 3xPG21 (3/4")
" LC Filters
When a mo tor is controlled by an adjustable frequency drive, resonance noise will be heard from
the motor. This noise, which is the result of the design of the motor, a rises e very time an inverter
switch in the adjustable frequency drive i s activated. The frequency of the resonance noise thus
corresponds to the switching frequency of the adjustable frequency drive.
For the FC 300 Series, D anfoss can supply an LC filter to dampen the acoustic motor noise.
The f ilter reduces the ramp-up time of the voltage, the peak load voltage U
PEAK
and the ripple
current ∆I to the motor, which means that current and voltage become almost sinusoidal.
The acoustic motor noise is thus reduced to a minimum.
The ripple current in the LC filter coils will also cause some noise. Solve the problem
by integrating the filter in a cabinet or similar.
82
MG.33.B6.22 - VLT is a registered Danfoss trademark
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