Cooling And Airflow - Danfoss VLT AQUA Drive FC 200 Operating Instructions Manual

How to Install

4.3.6 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.
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.
Enclosure protection
IP21/NEMA 1
IP54/NEMA 12
IP21/NEMA 1
Table 4.1 Heatsink Air Flow
NOTE
For the frequency converter section, 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)
7. Specific Power Card ambient temperature
exceeded (power size dependent)
8. Specific Control Card ambient temperature
exceeded
Once the fan is started it will run for minimum 10 minutes.
NOTE
For the active filter, the fan runs for the following reasons:
1. Active filter running
2. Active filter not running, but mains current
exceeding limit (power size dependent)
3. Specific heatsink temperature exceeded (power
size dependent)
4. Specific Power Card ambient temperature
exceeded (power size dependent)
5. Specific Control Card ambient temperature
exceeded
Once the fan is started it will run for minimum 10 minutes.
VLT AQUA Low Harmonic Drive Operating Instructions
Frame size
D13
E9 P315
E9 P355-P450
F18
®
MG20T202 - VLT is a registered Danfoss trademark
NOTE
A door fan(s) is required on the enclosure to remove the
heat losses not contained in the backchannel of the
frequency converter and any additional losses generated
from other components installed inside the enclosure. The
total required air flow must be calculated so that the
appropriate fans can be selected. Some enclosure
manufacturers offer software for performing the
calculations (i.e. Rittal Therm software).
Airflow
The necessary airflow over the heat sink must be secured.
The flow rate is shown below.
Door fan(s) / Top fan airflow
Total airflow of multiple fans
3
510 m /h (300 cfm)
3
680 m /h (400 cfm)
680 m 3 /h (400 cfm)
4900 m 3 /h (2884 cfm)
External ducts
If additional duct work is added externally to the Rittal
cabinet the pressure drop in the ducting must be
calculated. Use the charts below to derate the frequency
converter according to the pressure drop.
(%)
90
80
70
60
50
40
30
20
10
0
0 0.5 4.9 13 27.3
Pressure Increase
Illustration 4.21 D Frame Derating vs. Pressure Change
Drive air flow: 450 cfm (765 m
Heatsink fan(s)
Total airflow of multiple fans
3
2295 m /h (1350 cfm)
3
2635 m /h (1550 cfm)
2975 m 3 /h (1750 cfm)
6895 m 3 /h (4060 cfm)
45.9 66 89.3 115.7 147
(Pa)
3 /h)
29
4 4