B enclosures
60 PWM - Pulse Width Modulation
Illustration 3.5: Derating of I
out
for different T
AMB,
MAX
for enclosure B, using 60 PWM in Normal tor-
que mode (110% over torque)
SFAVM - Stator Frequency Asyncron
Vector Modulation
Illustration 3.6: Derating of I
out
for different T
AMB,
MAX
for enclosure B, using SFAVM in Normal torque
mode (110% over torque)
C enclosures
60 PWM - Pulse Width Modulation
Illustration 3.7: Derating of I
out
for different T
AMB,
MAX
for enclosure C, using 60 PWM in Normal tor-
que mode (110% over torque)
SFAVM - Stator Frequency Asyncron
Vector Modulation
Illustration 3.8: Derating of I
out
for different T
AMB,
MAX
for enclosure C, using SFAVM in Normal torque
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
) or max. output current (I
out
) should be derated in accordance with the shown diagram.
Illustration 3.9: Derating of output current versus altitude at T
AMB, MAX
. By altitudes above 2 km, please
contact Danfoss Drives regarding PELV.
3. VLT HVAC Selection
VLT
®
HVAC Drive Design Guide
64
MG.11.B2.02 - VLT
®
is a registered Danfoss trademark
3
Содержание VLT series
Страница 78: ...4 How to Order VLT HVAC Drive Design Guide 78 MG 11 B2 02 VLT is a registered Danfoss trademark 4...
Страница 120: ...7 RS 485 Installation and Set up VLT HVAC Drive Design Guide 120 MG 11 B2 02 VLT is a registered Danfoss trademark 7...
Страница 152: ...8 Troubleshooting VLT HVAC Drive Design Guide 152 MG 11 B2 02 VLT is a registered Danfoss trademark 8...