Danfoss VLT AutomationDrive FC 300 Design Manual page 76

4. FC 300 Selection
60 PWM - Pulse Width Modulation, 525 - 690 V
4
Illustration 4.29: Derating of I
closure E at 690 V, using 60 PWM in High torque mode (160%
over torque).
Illustration 4.31: Derating of I
closure E at 690 V, using 60 PWM in Normal torque mode
(110% over torque).
4.8.3. 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 4.33: Derating of output current versus altitude at T
regarding PELV.
76
for different T for en-
out AMB, MAX
for different T for en-
out AMB, MAX
MG.33.BA.02 - VLT
SFAVM - Stator Frequency Asyncron Vector Modulation, 525 -
690 V
Illustration 4.30: Derating of I
closure E at 690 V, using SFAVM in High torque mode (160%
over torque).
Illustration 4.32: Derating of I
closure E at 690 V, using SFAVM in Normal torque mode (110%
over torque).
) or max. output current (I
AMB
. By altitudes above 2 km, please contact Danfoss Drives
AMB, MAX
® is a registered Danfoss trademark
FC 300 Design Guide
for different T for en-
out AMB, MAX
for different T for en-
out AMB, MAX
) should be derated in
out