Danfoss VLT 6000 Quick Setup Manual page 8

Heat emission from VLT 6000 HVAC
The tables in General technical data show
the power loss P (W) from VLT 6000 HVAC.
Φ
The maximum cooling air temperature t
is 40° at 100% load (of rated value).
Ventilation of integrated VLT 6000 HVAC
The quantity of air required for cooling
frequency converters can be calculated as
follows:
1. Add up the values of P for all the
Φ
frequency converters to be integrated in the
same panel.
The highest cooling air temperature (t
present must be lower than t
The day/night average must be 5°C lower
(VDE 160).
The outlet temperature of the cooling air
must not exceed: t (45° C).
OUT, MAX
2. Calculate the permissible difference
between the temperature of the cooling air
(t ) and its outlet temperature (t
IN
∆t= 45° C-t
.
IN
3. Calculate the required
ΣP
x 3.1
quantity of air =
ϕ
∆t
Insert ∆t in Kelvin
The outlet from the ventilation must be
placed above the highest-mounted
frequency converter.
Allowance must be made for the pressure
loss across the filters and for the fact that
the pressure is going to drop as the filters
are choked.
MG.60.C4.02 – VLT is a registered Danfoss trademark
®
VLT 6000 HVAC
IN, MAX
)
IN
(40°C).
IN, MAX
):
OUT
3
m /h
7