Illustration 3.5: Derating Of I - Danfoss VLT Series Design Manual

3. VLT HVAC Selection
B enclosures
60 PWM - Pulse Width Modulation
3

Illustration 3.5: Derating of I

MAX
que mode (110% over torque)
C enclosures
60 PWM - Pulse Width Modulation
Illustration 3.7: Derating of I
MAX
que mode (110% over torque)
3.6.3. 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
AMB
Illustration 3.9: Derating of output current versus altitude at T
contact Danfoss Drives regarding PELV.
64
for different T
out
for enclosure B, using 60 PWM in Normal tor-
for different T
out
for enclosure C, using 60 PWM in Normal tor-
) or max. output current (I
out
MG.11.B2.02 - VLT
SFAVM - Stator Frequency Asyncron
Vector Modulation
AMB,
Illustration 3.6: Derating of I
for enclosure B, using SFAVM in Normal torque
MAX
mode (110% over torque)
SFAVM - Stator Frequency Asyncron
Vector Modulation
AMB,
Illustration 3.8: Derating of I
for enclosure C, using SFAVM in Normal torque
MAX
mode (110% over torque)
) should be derated in accordance with the shown diagram.
AMB, MAX
®
is a registered Danfoss trademark
®
VLT HVAC Drive Design Guide
for different T
out AMB,
for different T
out AMB,
. By altitudes above 2 km, please