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Automation VT Drive FC322 Design Guide
60 AVM - Pulse Width Modulation, 525 - 690 V
Illustration 3.17: Derating of I
for different T
for
out
AMB, MAX
enclosure E and F at 690 V, using 60 AVM in Normal torque
mode (110% over torque).
3.5.3 Derating for Low Air Pressure
The cooling capability of air is decreased at lower air pressure.
Below 1000 m altitude no derating is necessary but above 1000 m the ambient temperature (T
accordance with the shown diagram.
Illustration 3.19: Derating of output current versus altitude at T
Danfoss Drives regarding PELV.
An alternative is to lower the ambient temperature at high altitudes and thereby ensure 100% output current at high altitudes. As an example of how to
read the graph, the situation at 2 km is elaborated. At a temperature of 45° C (T
temperature of 41.7° C, 100% of the rated output current is available.
MG.20.X1.22 - VLT
Remote Site Products - 1-888-532-2706 - www.remotesiteproducts.com
http://www.remotesiteproducts.com/p-20783-Danfoss-131X8145-VLT-Automation-VT-Drive-VFD-FC322-460V-.5-HP.aspx
3 VLT Automation VT Drive Selection
SFAVM - Stator Frequency Asyncron Vector Modulation
Illustration 3.18: Derating of I
for different T
for
out
AMB, MAX
enclosure E and F at 690 V, using SFAVM in Normal torque
mode (110% over torque).
) or max. output current (I
) should be derated in
AMB
out
for frame sizes A, B and C. At altitudes above 2 km, please contact
AMB, MAX
- 3.3 K), 91% of the rated output current is available. At a
AMB, MAX
®
is a registered Danfoss trademark
3
75
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