Danfoss VLT AutomationDrive FC 300 Series - Automatic Derating

Max.I
out
(%)
at T
AMB, MAX
D, E and F enclosures
Altitude (km)
HO
NO
T
at 100% I
out
100%
96%
92%
0 K
-3 K
-6 K
1 km 2 km 3 km
-5 K
-8 K
-11 K
130BC015.10
AMB, MAX
Illustration 4.36 Derating of output current versus altitude at
T
AMB, MAX
for frame sizes D, E and F.
4.6.7
Automatic Derating
The frequency converter constantly checks for critical
levels:
•
Critical high temperature on the control card or
heatsink
•
High motor load
•
High DC link voltage
•
Low motor speed
As a response to a critical level, the frequency converter
adjusts the switching frequency. For critical high internal
temperatures and low motor speed, the frequency
converters can also force the PWM pattern to SFAVM.
NOTE
The automatic derating is different when 14-55 Output
Filter is set to [2] Sine-Wave Filter Fixed.
FC 300 Selection
VLT
®
AutomationDrive FC 300 Design Guide, 0.25-75 kW
86 MG33BE02 - VLT
®
is a registered Danfoss trademark
44
RSPSupply - 1-888-532-2706 - www.RSPSupply.com
http://www.RSPSupply.com/p-21462-Danfoss-131B8966-VLT-Automation-VT-Drive-VFD-FC301-230V-5-HP.aspx