Danfoss VLT HVAC Operating Instructions Manual page 139

®
VLT HVAC Drive Operating Instructions
If the frequency converter is operated at high ambient temperatures, the continuous output cur-
rent should be decreased.
The derating depends on the switching pattern, which can be set to 60 PWM or SFAVM in pa-
rameter 14-00.
A enclosures
60 PWM - Pulse Width Modulation
Illustration 8.1: Derating of I
for enclosure A, using 60 PWM
MAX
In enclosure A, the length of the motor cable has a relatively high impact on the recommended
derating. Therefore, the recommended derating for an application with max. 10 m motor cable is
also shown.
Illustration 8.3: Derating of I
for enclosure A, using 60 PWM and maximum
MAX
10 m motor cable
for different T
out
for different T
out
MG.11.A4.02 - 09.10.06. VLT ® is a registered Danfoss trademark
SFAVM - Stator Frequency Asyncron
Vector Modulation
AMB,
Illustration 8.2: Derating of I
for enclosure A, using SFAVM
MAX
Illustration 8.4: Derating of I
AMB,
for enclosure A, using SFAVM and maximum
MAX
10 m motor cable
8. Specifications
for different T
out AMB,
for different T
out AMB,
139
8