NOTE!
A door fan 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 calculations (i.e., Rittal Therm
software).
Airflow
The necessary airflow over the heatsink must be ensured. The flow rate is shown below.
Enclosure protection
Frame size
Door fan(s) / Top fan airflow
Total airflow of multiple fans
Heatsink fan(s)
Total airflow of multiple fans
IP21 / NEMA 1
IP54 / NEMA 12
D11
510 m
3
/h (300 cfm)
2295 m
3
/h (1350 cfm)
E7 P315
680 m
3
/h (400 cfm)
2635 m
3
/h (1550 cfm)
E7 P355-P450
680 m
3
/h (400 cfm)
2975 m
3
/h (1750 cfm)
IP21 / NEMA 1
F17
4900 m
3
/h (2884 cfm)
6895 m
3
/h (4060 cfm)
Table 4.1: Heatsink Air Flow
NOTE!
For the drive 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 a minimum of 10 minutes.
NOTE!
For the active filter, the fan runs for the following reasons:
1.
Active filter running
2.
Active filter not running, but line power 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 a minimum of 10 minutes.
4 How to Install
VLT AQUA Low Harmonic Drive Instruction
Manual
4-24
MG.20.T1.22 - VLT
®
is a registered Danfoss trademark
4
