Danfoss VLT AutomationDrive FC 300 Series Design Guide

FC 300 Design Guide
How to Select Your VLT
" External 24 V DC Supply
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 m ains.
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
" IP 21/IP 4X/ TYPE 1 (NEMA 1) Enclosure Kit
IP 20/IP 4 X top/ TYP E 1 ( NEMA 1 ) is an optional enclos ure element available for IP 20 Compact units.
If the enclosure kit is u sed, an IP 20 unit is upgraded to comp ly wit h enclosure IP 21 / 4X top/T YPE 1 (NEM A 1 ).
The IP 4X top c an be applied to all standard IP 20 FC 30X variants.
For more information, see chapter How to Install.
" LC Filters
When a motor is controlled by an ad justable frequency d r ive, resonance noise will be heard from
the motor. This noise, which is the result of the design of the motor, a rises every 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 adjusta ble 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
PEAK
and the ripple
current ∆I to the motor, which means that current and voltage become almost sinusoidal.
Consequently, the acoustic motor noise is re duce d to a minimum.
The ripple current in the coils will also cause some noise . Solve the p roblem by inte-
grating the filter into a cabinet or similar.
69
MG.33.B3.22 - VLT is a registered Danfoss trademark

Danfoss VLT AutomationDrive FC 300 Series Specifications

General

Brand	Danfoss
Model	VLT AutomationDrive FC 300 Series
Category	DC Drives
Language	English