External 24 V Dc Supply; Ip 21/Ip 4X/ Type 1 (Nema 1) Enclosure Kit; Lc Filters - Danfoss VLT AutomationDrive FC 300 Design Manual

FC 300 Design Guide

External 24 V DC Supply

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You can use the external 24 V DC supply as
a low-voltage supply to the control card or
any option card installed. This enables full
operation of the LCP (including parameter setting)
without connection to mains.

IP 21/IP 4X/ TYPE 1 (NEMA 1) Enclosure Kit

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IP 20/IP 4X top/ TYPE 1 (NEMA 1) is an optional enclosure element available for IP 20 Compact units.
If the enclosure kit is used, an IP 20 unit is upgraded to comply with enclosure IP 21/ 4X top/TYPE 1 (NEMA 1).
The IP 4X top can be applied to all standard IP 20 FC 30X variants.
For more information, see chapter How to Install.

LC Filters

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When a motor 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, arises every time an inverter
switch in the adjustable frequency drive is activated. The frequency of the resonance noise thus
corresponds to the switching frequency of the adjustable frequency drive.
For the FC 300 Series, Danfoss can supply an LC filter to dampen the acoustic motor noise.
The filter reduces the ramp-up time of the voltage, the peak load voltage U
current ∆I to the motor, which means that current and voltage become almost sinusoidal.
Consequently, the acoustic motor noise is reduced to a minimum.
The ripple current in the coils will also cause some noise. Solve the problem by inte-
grating the filter into a cabinet or similar.
How to Select Your VLT
MG.33.B3.22 - VLT is a registered Danfoss trademark
External 24 V DC supply specification
Input voltage range: 24 V DC +15 %
(max. 37 V in 10 s)
Max. input current: 2.2 A
Max. cable length: 246 ft (75 m)
Input capacitance load: < 110 uF
Power-up delay: < 0.6 s
and the ripple
PEAK
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