Automatic Derating - Danfoss VLT AutomationDrive FC 300 Design Manual

Selection

4.7.3 Automatic Derating

The adjustable frequency drive 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 adjustable frequency
drive adjusts the switching frequency. For critical high
internal temperatures and low motor speed, the adjustable
frequency drives can also force the PWM pattern to
SFAVM.
NOTICE!
The automatic derating is different when 14-55 Output
Filter is set to [2] Sine-Wave Filter Fixed.
MG34S222
Design Guide
Danfoss A/S © Rev. 2014-02-10 All rights reserved.
4 4
89