Mounting; Cooling And Airflow - Danfoss VLT Refrigeration Drive FC 103 Operating Instructions Manual

Mechanical Installation

3.3 Mounting

3.3.1 Cooling and Airflow

Cooling
Obtain cooling by taking air in through the plinth in the front and out of the top, 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. This offers a solution where the backchannel could take air
from outside the facility and return the heat losses outside the facility, thus reducing air-conditioning requirements.
Airflow
Secure the necessary airflow over the heat sink. The flow rate is shown in Table 3.1.
Enclosure protection
IP21/NEMA 1
IP54/NEMA 12
Table 3.1 Heat Sink Air Flow
NOTICE
For the frequency converter section, the fan runs for the
following reasons:
•
AMA.
•
DC hold.
•
Pre-mag.
•
DC brake.
•
60% of nominal current is exceeded.
•
Specific heat sink temperature exceeded (power
size dependent).
•
Specific power card ambient temperature
exceeded (power size dependent).
•
Specific control card ambient temperature
exceeded.
Once the fan is started, it runs for minimum 10 minutes.
MG16N102
Operating Instructions
Enclosure size
D1n
D2n
E9
F18
Danfoss A/S © 08/2015 All rights reserved.
Door fan/top fan airflow
Total airflow of multiple fans
3
3 door fans, 442 m /h
2+1=2x170+102
3
3 door fan, 544 m /h
2+1=2x170+204
4 door fans, 680 m 3 /h (400 cfm)
(2+2, 4x170=680)
6 door fans, 3150 m 3 /h (1854
cfm)
(6x525=3150)
NOTICE
For the active filter, the fan runs for the following
reasons:
•
Active filter running.
•
Active filter not running, but mains current
exceeding the limit (power size dependent).
•
Specific heat sink temperature exceeded (power
size dependent).
•
Specific power card ambient temperature
exceeded (power size dependent).
•
Specific control card ambient temperature
exceeded.
Once the fan is started, it runs for minimum 10 minutes.
External ducts
If additional duct work is added externally to the Rittal
cabinet, calculate the pressure drop in the ducting. Use
Illustration 3.2, Illustration 3.3, and Illustration 3.4 to derate
the frequency converter according to the pressure drop.
Heat sink fan
Total airflow for multiple fans
3
2 heat sink fans, 1185 m /h
(1+1=765+544)
3
2 heat sink fans, 1605 m /h
(1+1=765+840)
2 heat sink fans, 2675 m 3 /h
(1574 cfm)
(1+1, 1230+1445=2675)
5 heat sink fans, 4485 m 3 /h
(2639 cfm)
2+1+2, ((2x765)+(3x985)=4485)
23
3 3