Danfoss VLT HVAC Drive Instruction Manual page 150

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 a lower air pressure.
At altitudes higher than 6,600 feet [2 km], please contact Danfoss Drives regarding PELV.
At an altitude lower than 3,280 ft [1,000 m], no derating is necessary; but at an altitude higher
than 3,280 ft [1,000 m], the ambient temperature (T
derated in accordance with the diagram shown.
150
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-
MG.11.A4.22 - VLT
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)
) or max. output current (I
AMB
® is a registered Danfoss trademark
® HVAC Drive Instruction Manual
for different T
out AMB,
for different T
out AMB,
) should be
out