60 AVM - Pulse Width Modulation, 525 - 600 V
Illustration 10.17: Derating of I
out
for different T
AMB, MAX
for enclosure E
at 600 V, using 60 AVM in Normal torque mode (110% over torque).
SFAVM - Stator Frequency Asyncron Vector Modulation
Illustration 10.18: Derating of I
out
for different T
AMB, MAX
for enclosure E
at 600 V, using SFAVM in Normal torque mode (110% over torque).
10.2.3. Derating for Low Air Pressure
The cooling capability of air is decreased at lower air pressure.
At altitudes higher than 2 km, please contact Danfoss regarding PELV.
Below 1000 m altitude no derating is necessary but above 1000 m the ambient temperature (T
AMB
) or max. output current (I
out
) should be derated in
accordance with the shown diagram.
Illustration 10.19: Derating of output current versus altitude at T
AMB, MAX
. By altitudes above 2 km, please contact Danfoss regarding PELV.
An alternative is to lower the ambient temperature at high altitudes and thereby ensure 100% output current at high altitudes.
10. Specifications
VLT
®
AQUA Drive
Operating Instructions
166
MG.20.M5.02 - VLT
®
is a registered Danfoss trademark
10
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