ABB ACS880 Firmware Manual page 236

236 Parameters
No. Name/Value
25.18 Speed adapt min
limit
25.21 Kp adapt coef at min speed
25.22 Ti adapt coef at min speed
0...30000 rpm
25.19 Speed adapt max
limit
0...30000 rpm
25.21 Kp adapt coef at
min speed
0.000 ... 10.000
25.22 Ti adapt coef at min
speed
0.000 ... 10.000
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Description
Minimum actual speed for speed controller adaptation.
Speed controller gain and integration time can be adapted
according to actual speed
This is done by multiplying the gain
gain) and integration time
coefficients at certain speeds. The coefficients are defined
individually for both gain and integration time.
When actual speed is below or equal to
min limit, the gain is multiplied by
speed, and the integration time divided by
at min speed.
When actual speed is equal to or above
max limit, no adaptation takes place (the coefficient is 1).
When actual speed is between
and 25.19 Speed adapt max
and integration time are calculated linearly on the basis of the
breakpoints.
See also the block diagram on page 580.
Coefficient for K or T
p I
1.000
or
0 25.18 Speed
adapt min limit
Minimum actual speed for speed controller adaptation.
Maximum actual speed for speed controller adaptation.
See parameter 25.18 Speed adapt min
Maximum actual speed for speed controller adaptation.
Proportional gain coefficient at minimum actual speed.
See parameter 25.18 Speed adapt min
Proportional gain coefficient at minimum actual speed.
Integration time coefficient at minimum actual speed.
See parameter 25.18 Speed adapt min
Integration time coefficient at minimum actual speed.
(90.01 Motor speed for control).
(25.02 Speed proportional
(25.03 Speed integration time) by
25.18 Speed adapt
25.21 Kp adapt coef at min
25.22 Ti adapt coef
25.19 Speed adapt
25.18 Speed adapt min limit
limit, the coefficients for the gain
K = Proportional gain
p
T = Integration time
I
25.19 Speed
adapt max limit
limit.
limit.
limit.
Def/FbEq16
0 rpm
Actual speed
(90.01) (rpm)
1 = 1 rpm
0 rpm
1 = 1 rpm
1.000
1000 = 1
1.000
1000 = 1