ABB ACS880 Firmware Manual page 332

332 Parameters
No. Name / Range /
Selection
25.18 Speed adapt min
limit
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
Description
Minimum actual speed for speed controller adaptation.
Speed controller gain and integration time can be
adapted according to actual speed
for control).
This is done by multiplying the gain
proportional gain) and integration time
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
adapt min limit, the gain is multiplied by
coef at min speed, and the integration time divided by
25.22 Ti adapt coef at min
When actual speed is equal to or above
adapt max limit, no adaptation takes place (the
coefficient is 1).
When actual speed is between
limit and 25.19 Speed adapt max
for the gain and integration time are calculated linearly
on the basis of the breakpoints.
See also the block diagram on page 750.
Coefficient for K or T
p I
1.000
25.21 or
25.22
0
25.18
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.
(90.1 Motor speed
(25.2 Speed
(25.3 Speed
25.18 Speed
25.21 Kp adapt
speed.
25.19 Speed
25.18 Speed adapt min
limit, the coefficients
K = Proportional gain
p
T = Integration time
I
25.19
limit.
limit.
limit.
Def / Type
FbEq 16b / 32b
- / real32
Actual speed
( 90.01 ) (rpm)
1 = 1 rpm / 1 = 1 rpm
- / real32
1 = 1 rpm / 1 = 1 rpm
1.000 / real32
1000 = 1 / 1000 = 1
1.000 / real32
1000 = 1 / 1000 = 1