Danfoss vlt AQUA Instruction Manual page 176

10 Specifications
60 AVM - Pulse Width Modulation, 525–600 V
Figure 10.17: Derating of I
closure E at 600 V, using 60 AVM in normal torque mode
(110% over torque).
10.2.3 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 regarding PELV.
At an altitude lower than 3,280 ft [1,000 m], no derating is necessary, but above 3,280 ft [1,000 m], the ambient temperature (T
current (I ) should be derated in accordance with the diagram shown.
out
10
Figure 10.19: Derating of output current versus altitude at T
PELV.
An alternative is to lower the ambient temperature at high altitudes and thereby ensure 100% output current at high altitudes.
10-20
for different T for en-
out AMB, MAX
AMB, MAX
MG.20.M5.22 - VLT
SFAVM - Stator Frequency Asyncron Vector Modulation
Figure 10.18: Derating of I
closure E at 600 V, using SFAVM in normal torque mode
(110% over torque).
. At altitudes above 6,600 feet [2 km], please contact Danfoss regarding
®
is a registered Danfoss trademark
®
VLT AQUA Drive
Instruction Manual
for different T for en-
out AMB, MAX
) or max. output
AMB