A door fan(s) is required on the enclosure to remove the
heat not contained in the backchannel of the frequency
converters and any additional losses generated by other
components inside the enclosure. The total required air
flow must be calculated so that the appropriate fans can
be selected.
Airflow
The necessary airflow over the heat sink must be secured.
The flow rate is shown in
Table 2.2
.
The fan runs for the following reasons:
•
AMA
•
DC Hold
•
Pre-Mag
•
DC Brake
•
60% of nominal current is exceeded
•
Specific heatsink temperature exceeded (power
size dependent).
•
Specific Power Card ambient temperature
exceeded (power size dependent)
•
Specific Control Card ambient temperature
exceeded
Frame
Door fan/top fan
Heatsink fan
D1h/D3h
102 m
3
/hr (60 CFM)
420 m
3
/hr (250 CFM)
D2h/D4h
204 m
3
/hr (120 CFM)
840 m
3
/hr (500 CFM)
Table 2.2 Airflow
2.3.2 Lifting
Always lift the frequency converter using the dedicated
lifting eyes. Use a bar to avoid bending the lifting holes.
Figure 2.1 Position Lifting Straps where Indicated
CAUTION
The angle from the top of the frequency converter to the
lifting cables should be 60
°
or greater.
2.3.3 Wall Mounting - IP21 (NEMA 1) and
IP54 (NEMA 12) Units
Consider the following before selecting the final instal-
lation site:
•
Free space for cooling
•
Access to open the door
•
Cable entry from the bottom
Installation
VLT® Automation VT Drive FC 322 D-Frame Instruction Manual
2-2
MG21E122 - VLT® is a registered Danfoss trademark
2
2
Remote Site Products - 1-888-532-2706 - www.remotesiteproducts.com
http://www.remotesiteproducts.com/p-20776-Danfoss-131X8139-VLT-Automation-VT-Drive-VFD-FC322-230V-20-HP.aspx
