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VLT
AQUA Drive Design Guide
5.2.7 Cooling and Airflow
Cooling
Cooling can be obtained in different ways, by using the cooling ducts in the bottom and the top of the unit, by taking air in and out the back of the unit
or by combining the cooling possibilities.
Duct cooling
A dedicated option has been developed to optimize installation of IP00/chassis frame frequency converters in Rittal TS8 enclosures utilizing the fan of
the frequency converter for forced air cooling of the backchannel. The air out the top of the enclosure could but ducted outside a facility so the heat loses
from the backchannel are not dissipated within the control room reducing air-conditioning requirements of the facility.
Please see
Installation of Duct Cooling Kit in Rittal enclosures
Back cooling
The backchannel air can also be ventilated in and out the back of a Rittal TS8 enclosure. This offers a solution where the backchannel could take air from
outside the facility and return the heat loses outside the facility thus reducing air-conditioning requirements.
NB!
A doorfan(s) is required on the Rittal cabinet to remove the loses not contained in the backchannel of the drive. The minimum doorfan(s)
airflow required at the drive maximum ambient for the D3 and D4 is 391 m^3/h (230 cfm). The minimum doorfan(s) airflow required
at the drive maximum ambient for the E2 is 782 m^3/h (460 cfm). If the ambient is below maximum or if additional components, heat
loses, are added within the enclosure a calculation must be made to ensure the proper airflow is provided to cool the inside of the
Rittal enclosure.
Airflow
The necessary airflow over the heat sink must be secured. The flow rate is shown below.
Enclosure protection
IP21 / NEMA 1
IP54 / NEMA 12
IP21 / NEMA 1
IP54 / NEMA 12
IP00 / Chassis
* Airflow per fan. Frame size F contain multiple fans.
Table 5.2: Heatsink Air Flow
NB!
The fan runs for the following reasons:
1.
AMA
2.
DC Hold
3.
Pre-Mag
4.
DC Brake
5.
60% of nominal current is exceeded
6.
Specific heatsink temperature exceeded (power size dependent).
Once the fan is started it will run for minimum 10 minutes.
5.2.8 Gland/Conduit Entry - IP21 (NEMA 1) and IP54 (NEMA12)
Cables are connected through the gland plate from the bottom. Remove the plate and plan where to place the entry for the glands or conduits. Prepare
holes in the marked area on the drawing.
, for further information.
Frame size
D1 and D2
E1
F1, F2, F3 and F4
F1, F2, F3 and F4
D3 and D4
E2
®
MG.20.N5.02 - VLT
is a registered Danfoss trademark
Door fan / Top fan airflow
3
170 m
/h (100 cfm)
3
340 m
/h (200 cfm)
700 m
3
/h (412 cfm)*
525 m
3
/h (309 cfm)*
255 m
3
/h (150 cfm)
255 m
3
/h (150 cfm)
5 How to Install
Airflow over heatsink
3
765 m
/h (450 cfm)
3
1444 m
/h (850 cfm)
985 m
3
/h (580 cfm)
985 m
3
/h (580 cfm)
765 m
3
/h (450 cfm)
1444 m
3
/h (850 cfm)
5
117
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