ABB ACS850 series, Firmware Manual

Page: 134 / 260

134 Parameters
23.15 PI adapt max sp Maximum 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 (
23.01 Proport gain ) and integration time ( 23.02
Integration time ) by coefficients at certain speeds. The
coefficients are defined individually for both gain and
integration time.
When the actual speed is below or equal to
23.16 PI adapt
min sp , 23.01 Proport gain and 23.02 Integration time are
multiplied by 23.17 Pcoef at min sp and 23.18 Icoef at min sp
respectively.
When the actual speed is equal to or exceeds
23.15 PI adapt
max sp , no adaptation takes place; in other words, 23.01
Proport gain and 23.02 Integration time are used as such.
Between 23.16 PI adapt min sp and 23.15 PI adapt max sp ,
the coefficients are calculated linearly on the basis of the
breakpoints.
0 … 30000 rpm Maximum actual speed for speed controller adaptation. 1 = 1 rpm
23.16 PI adapt min sp Minimum actual speed for speed controller adaptation. See
parameter
23.15 PI adapt max sp .
0 … 30000 rpm Minimum actual speed for speed controller adaptation. 1 = 1 rpm
23.17 Pcoef at min sp Proportional gain coefficient at minimum actual speed. See
parameter
23.15 PI adapt max sp .
0.000 … 10.000 Proportional gain coefficient at minimum actual speed. 1000 = 1
23.18 Icoef at min sp Integration time coefficient at minimum actual speed. See
parameter
23.15 PI adapt max sp .
0.000 … 10.000 Integration time coefficient at minimum actual speed. 1000 = 1
23.20 PI tune mode Activates the speed controller autotune function.
Done No tuning has been requested (normal operation) 0
Smooth Request speed controller autotune with preset settings for
smooth operation. 1
Middle Request speed controller autotune with preset settings for
medium-tight operation. 2
No. Name/Value Description FbEq
Coefficient for K
p
or T
I
K
p
= Proportional gain
T
I
= Integration time
Actual speed
(rpm)
23.17 Pcoef at min sp or
23.18 Icoef at min sp
23.16 PI adapt
min sp
23.15 PI adapt
max sp
1.000
0