NB!
A door fan(s) is required on the enclosure to remove
the heat losses not contained in the backchannel of
the drive 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 cal-
culations (i.e. Rittal Therm software). If the VLT is
the only heat generating component in the enclo-
sure, the minimum airflow required at an ambient
temperature of 45
o
C for the D3 and D4 drives is 391
m
3
/h (230 cfm). The minimum airflow required at an
ambient temperature of 45
o
C for the E2 drive is 782
m
3
/h (460 cfm).
Airflow
The necessary airflow over the heat sink must be secured. The flow
rate is in par. .
Enclosure protection
Frame size
Door fan(s) / Top fan airflow
Heatsink fan(s)
IP21 / NEMA 1
IP54 / NEMA 12
D1 and D2
170 m
3
/h (100 cfm)
765 m
3
/h (450 cfm)
E1 P315T5, P450T7, P500T7
340 m
3
/h (200 cfm)
1105 m
3
/h (650 cfm)
E1 P355-P450T5, P560-P630T7
340 m
3
/h (200 cfm)
1445 m
3
/h (850 cfm)
IP21 / NEMA 1
F1, F2, F3 and F4
700 m
3
/h (412 cfm)*
985 m
3
/h (580 cfm)*
IP54 / NEMA 12
F1, F2, F3 and F4
525 m
3
/h (309 cfm)*
985 m
3
/h (580 cfm)*
IP00 / Chassis
D3 and D4
255 m
3
/h (150 cfm)
765 m
3
/h (450 cfm)
E2 P315T5, P450T7, P500T7
255 m
3
/h (150 cfm)
1105 m
3
/h (650 cfm)
E2 P355-P450T5, P560-P630T7
255 m
3
/h (150 cfm)
1445 m
3
/h (850 cfm)
* Airflow per fan. Frame size F contain multiple fans.
Table 3.3: 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)
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.
VLT HVAC Drive High Power Operating In-
structions
3 Mechanical Installation
MG.11.F3.02 - VLT
®
is a registered Danfoss trademark
37
3