MG.60.C4.02 – VLT is a registered Danfoss trademark
7
VLT
®
6000 HVAC
■ ■
■ ■
■ Heat emission from VLT 6000 HVAC
The tables in General technical data show
the power loss P
Φ
(W) from VLT 6000 HVAC.
The maximum cooling air temperature t
IN, MAX
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
Φ
for all the
frequency converters to be integrated in the
same panel.
The highest cooling air temperature (t
IN
)
present must be lower than t
IN, MAX
(40°C).
The day/night average must be 5°C lower
(VDE 160).
The outlet temperature of the cooling air
must not exceed: t
OUT, MAX
(45° C).
2. Calculate the permissible difference
between the temperature of the cooling air
(t
IN
) and its outlet temperature (t
OUT
):
∆t= 45° C-t
IN
.
3. Calculate the required
quantity of air = ΣP
ϕ
x 3.1 m
3
/h
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.
∆t
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