Danfoss VLT HVAC Operating Instructions Manual page 140

8. Specifications
B enclosures
60 PWM - Pulse Width Modulation
Illustration 8.5: Derating of I
MAX
que mode (110% over torque)
C enclosures
60 PWM - Pulse Width Modulation
8
Illustration 8.7: Derating of I
MAX
que mode (110% over torque)
8.2.3. 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 8.9: Derating of output current versus altitude at T
contact Danfoss Drives regarding PELV.
140
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.A4.02 - 09.10.06. VLT
SFAVM - Stator Frequency Asyncron
Vector Modulation
AMB,
Illustration 8.6: Derating of I
for enclosure B, using SFAVM in Normal torque
MAX
mode (110% over torque)
SFAVM - Stator Frequency Asyncron
Vector Modulation
AMB,
Illustration 8.8: 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 Operating Instructions
for different T
out
for different T
out
. By altitudes above 2 km, please
AMB,
AMB,