Danfoss VLT AQUA Drive Design Manual page 66

3. VLT AQUA Selection
60 AVM - Pulse Width Modulation, 525 - 600 V
3
Illustration 3.17: Derating of I
at 600 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.
At altitudes higher than 2 km, please contact regarding PELV.
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
An alternative is to lower the ambient temperature at high altitudes and thereby ensure 100% output current at high altitudes.
66
for different T for enclosure E
out AMB, MAX
AMB, MAX
MG.20.N4.02 - VLT
SFAVM - Stator Frequency Asyncron Vector Modulation
Illustration 3.18: Derating of I
at 600 V, using SFAVM in Normal torque mode (110% over torque).
) or max. output current (I
AMB
. By altitudes above 2 km, please contact regarding PELV.
®
is a registered Danfoss trademark
®
VLT AQUA Drive Design Guide
for different T for enclosure E
out AMB, MAX
) should be derated in
out