Oscillation decrease when the machine is operated at the current limit in case of higher speed

Question:

How can oscillations be decreased when the machine is operated at the current limit in case of higher speed (> half of the rated speed)?

Answer:

Especially in case of high power (> 75 kW) and in case of v/f characteristic control a too high proportional gain of the current controller (C0075) can cause oscillations. Therefore, the Lenze factory default settings of the current controller gain with C0075 = 0.04 is lower in case of EVF9335 ... EVF9383 drive controllers with high power (110 ... 400 kW) than in case of  EVF9321 ... EVF9333 drive controllers (0.37 ... 90 kW), where Lenze factory default setting is C0075 = 0.2.

URL for linking this AKB article: https://www.lenze.com/en-de/go/akb/20030667/1/
Meta data
Taxonomy: 9300 vector EVF93xx-EH hoist frequency inverters , 9300 vector EVF93xx-EV frequency inverters , 9300 vector frequency inverters
AKB-ID: 20030667
Last update: 2024/01/11
Category: FAQ, Tips and Tricks

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