ABB ACS880 - Page 291

Def / Type
FbEq 16b / 32b
DescriptionName / Range /
Selection
No.
- / real32Minimum actual speed for speed controller adaptation.
Speed controller gain and integration time can be adapted
according to actual speed (90.1 Motor speed for control).
This is done by multiplying the gain (25.2 Speed
proportional gain) and integration time (25.3 Speed
integration time) by coefficients at certain speeds. The
coefficients are defined individually for both gain and
integration time.
When actual speed is below or equal to 25.18 Speed adapt
min limit, the gain is multiplied by 25.21 Kp adapt coef at
min speed, and the integration time divided by 25.22 Ti
adapt coef at min speed.
When actual speed is equal to or above 25.19 Speed adapt
max limit, no adaptation takes place (the coefficient is 1).
When actual speed is between 25.18 Speed adapt min
limit and 25.19 Speed adapt max limit, the coefficients for
the gain and integration time are calculated linearly on the
basis of the breakpoints.
See also the block diagram on page 630.
1.000
K
p
= Proportional gain
T
I
= Integration time
Actual speed
(90.01) (rpm)
25.19
25.18
Coefficient for K
p
or T
I
25.21 or
25.22
0
Speed adapt min limit25.18
1 = 1 rpm / 1 = 1 rpmMinimum actual speed for speed controller adaptation.0...30000 rpm
- / real32Maximum actual speed for speed controller adaptation.
See parameter 25.18 Speed adapt min limit.
Speed adapt max limit25.19
1 = 1 rpm / 1 = 1 rpmMaximum actual speed for speed controller adaptation.0...30000 rpm
1.000 / real32Proportional gain coefficient at minimum actual speed.
See parameter 25.18 Speed adapt min limit.
Kp adapt coef at min
speed
25.21
1000 = 1 / 1000 = 1Proportional gain coefficient at minimum actual speed.0.000 ... 10.000
1.000 / real32Integration time coefficient at minimum actual speed.
See parameter 25.18 Speed adapt min limit.
Ti adapt coef at min
speed
25.22
1000 = 1 / 1000 = 1Integration time coefficient at minimum actual speed.0.000 ... 10.000
Parameters 291