Danfoss VLT 3006 Product Manual page 45

Heat emission from
®
the VLT 3000
®
Ventilation of VLT units
when panel-mounted
Example:
44
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Mechanical installation
The tables on pp. 25-29 show the output
loss P (W) from the VLT ®
2
maximum cooling air temperature t
40° C at 100% load (of rated value).
The quantity of air needed to cool the
VLT ® frequency converters can be calcu-
lated as follows:
1. Add up the values of P
VLT ® 's to be installed in the same panel.
The highest cooling air temperature (t
occurring must be lower than t
(40° C).
The day/night average must be 5° C
lower (VDE 160).
The outlet temperature of the cooling air
may not exceed: t
OUT,MAX
2. Calculate the permitted temperature
difference between the cooling air
temperature (t ) and the cooling air
IN ): ∆t = 45° C-t
outlet temperature (t
OUT
The total output loss and the total air
requirement at 100% load for 8 VLT
3006 units mounted in the same panel.
Cooling air temperature (t
max. cooling air outlet temperature
(t ) = 45° C.
OUT,MAX
P = 280 W and t
Φ
IN, MAX
®
MG.30.A7.02 - VLT is a registered Danfoss trademark
3000. The
is
IN,MAX
for all the
3. Calculate the necessary quantity of air
Φ
in m
)
IN
IN,MAX
The outlet from the fan must be located
above the highest mounted frequency
converter.
(45° C).
Remember to take pressure drops over
filters into account and that the pressure
decreases as the filters are choked.
IN
®
type
1. ∑P
) = 40° C and
2. ∆t = 45°C-t
IN
2. Quantity of air (at 40°C) =
2240 x 3.1
= 40° C.
3 /h =
∑P
x 3.1
Φ
Insert ∆t in Kelvin
∆t
= 8 x P W = t = 2240 W.
Φ Φ
IN, MAX
= 45°C-40°C= = 5°K.
IN
= 1388 m 3 /h
5