Danfoss VLT AutomationDrive FC 300 Design Manual page 81

FC 300 Design Guide
60 PWM - Pulse Width Modulation, 525
- 690 V
Illustration 4.29: Derating of I
for enclosure E at 690 V, using 60 PWM in High
MAX
torque mode (160% over torque).
Illustration 4.31: Derating of I
for enclosure E at 690 V, using 60 PWM in
MAX
Normal torque mode (110% over torque).
4.7.3. 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 ) or max. output current (I
AMB
Illustration 4.33: Derating of output current versus altitude at T
contact Danfoss Drives regarding PELV.
for different T
out AMB,
for different T
out AMB,
) should be derated in accordance with the shown diagram.
out
MG.33.B9.02 - VLT ® is a registered Danfoss trademark
SFAVM - Stator Frequency Asyncron
Vector Modulation, 525 - 690 V
Illustration 4.30: Derating of I
out
for enclosure E at 690 V, using SFAVM in High
MAX
torque mode (160% over torque).
Illustration 4.32: Derating of I
out
for enclosure E at 690 V, using SFAVM in Nor-
MAX
mal torque mode (110% over torque).
. By altitudes above 2 km, please
AMB, MAX
4. FC 300 Selection
for different T
AMB,
for different T
AMB,
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