Danfoss VLT HVAC Drive FC 102 Operating Instructions Manual page 29

Mechanical Installation
CAUTION
Install a door fan 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.
Calculate the total required airflow to select the
appropriate fans. Some enclosure manufacturers offer
software for performing the calculations (Rittal Therm
software). If the frequency converter is the only heat-
generating component in the enclosure, the minimum
airflow required at an ambient temperature of 45 °C for
the E2 frequency converter is 782 m
Airflow
Provide sufficient airflow over the heat sink. The flow rate
is shown in Table 3.8.
Enclosure
protection Enclosure size
rating
E1 P315T4,
P450T7,
IP21/NEMA 1 P500T7
IP54/NEMA 12
E1 P355-
P450T4, P560-
P630T7
IP21/NEMA 1 F1, F2, F3 and
F4
IP54/NEMA 12 F1, F2, F3 and
F4
E2 P315T4,
P450T7,
P500T7
IP00/Chassis
E2 P355-
P450T4, P560-
P630T7
* Airflow per fan. Enclosure type F contains multiple fans.
Table 3.8 Heat Sink Airflow
MG11F502
Operating Instructions
3 /h (460 cfm).
Door fan/ Heat sink fan
top fan
airflow
340 m 3 /h 1105 m 3 /h
(200 cfm) (650 cfm)
3 3
340 m /h 1445 m /h
(200 cfm) (850 cfm)
3 3
700 m /h 985 m /h
(412 cfm)* (580 cfm)*
3 3
525 m /h 985 m /h
(309 cfm)* (580 cfm)*
255 m 3 /h 1105 m 3 /h
(150 cfm) (650 cfm)
3 3
255 m /h 1445 m /h
(150 cfm) (850 cfm)
Danfoss A/S © 08/2014 All rights reserved.
NOTICE
The fan runs for the following reasons:
•
AMA.
•
DC Hold.
•
Pre-Mag.
•
DC Brake.
•
60% of nominal current is exceeded.
•
Specific heat sink temperature is exceeded
(power size dependent).
•
Specific power card ambient temperature is
exceeded (power size dependent).
•
Specific control card ambient temperature is
exceeded.
Once the fan is started, it runs for minimum 10 minutes.
External ducts
If extra duct work is added externally to the Rittal cabinet,
calculate the pressure drop in the ducting. Use the
following charts to derate the frequency converter
according to the pressure drop.
(%)
90
80
70
60
50
40
30
20
10
0
0 0 0.1 3.6 9.8 21.5 43.4
Pressure Change
Illustration 3.31 E Enclosure Derating vs. Pressure Change
(Small Fan), P315T4 and P450T7-P500T7
Frequency Converter Airflow: 650 cfm (1105 m
(%)
90
80
70
60
50
40
30
20
10
0
0 0.2 0.6 2.2 5.8 11.4 18.1 30.8
Pressure Change
Illustration 3.32 E Enclosure Derating vs. Pressure Change
(Large Fan), P355T4-P450T4 and P560T7-P630T7
Frequency Converter Airflow: 850 cfm (1445 m
3
76 147.1 237.5 278.9
(Pa)
3
/h)
69.5 152.8 210.8
(Pa)
3 /h)
27
3