Tuning CDHD
220 User Manual
Figur e 9 - 3 4 . Tuning for vibr a t ion suppre ssion, fast e r se tt ling tim e
Figur e 9 - 3 5 . Sett ling t im e – w it h anti- vibra t ion t unin g
9 .1 2 Gains – M anual Tuning
KN LD - De r ivat ive Gain
1 . Set KNLP to half the value that was set by default.
2 . Set KNLI and KNLIV to zero.
3 . I ncrease KNLD unt il oscillat ions of I CMD are observed.
The acceptable level of I CMD ripple depends on the system , primarily the load. It
can often be judged by the acoustical noise.
Light loads (LMJR < 2): 5% of rated current m ay be normal.
Higher loads (LMJR > 2): 10% of rated current may result in acceptable ripple.
KNLD value too high
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