ABB ACS800 Series Firmware Manual page 100

88
No. Name/Value
23.11 P-GAIN MIN
0...100
23.12 P-GAIN WEAKPOINT
0...Max Torque%
23.13 P-GAIN WP FILT
0...99999 ms
23.14 DROOP RATE
0.0...100.0%
23.15 KPS TIS MIN FREQ
0...200 Hz
23.16 KPS TIS MAX FREQ
0...200 Hz
23.17 KPS VAL MIN FREQ
Actual signals and parameters
Description
The proportional gain setting when the speed controller output is zero.
Note: Visible only after entering proper code in
Setting range.
The output level of the speed controller where the gain is set to
23.01 GAIN.
Note: Visible only after entering proper code in
Setting range.
This can soften the rate of change for the proportional gain.
Note: Visible only after entering proper code in
Filter time constant.
Defines the droop rate. The parameter value needs to be changed
only if both the Master and the Follower are speed-controlled.
The droop rate needs to be set both for the Master and the Follower.
The correct droop rate for a process must be found out case by case
in practice.
The drooping prevents a conflict between the Master and the Follower
by allowing a slight speed difference between them. The drooping
slightly decreases the drive speed as the drive load increases. The
actual speed decrease at a certain operating point depends on the
droop rate setting and the drive load ( = torque reference / speed
controller output). At 100% speed controller output, drooping is at its
nominal level, i.e. equal to the value of the DROOP RATE. The
drooping effect decreases linearly to zero along with the decreasing
load.
Speed decrease = Speed controller output · Drooping · Max. speed
Example: Speed Controller output is 50%,
DROOP RATE is 1%,
maximum speed of the drive is 1500 rpm.
Speed decrease = 0.50 · 0.01 · 1500 rpm = 7.5 rpm
No Drooping
100%
Motor
Speed
% of
nominal
Setting range.
The minimum frequency limit above which the relative gain and
integral time is defined by
VAL MIN FREQ.
Note: Visible only after entering proper code in
Setting range.
The frequency point which relative KPS and TIS equal 100%.
Note: Visible only after entering proper code in
Setting range.
The relative gain percentage of the KPS value at the speed defined by
23.15 KPS TIS MIN FREQ.
Note: Visible only after entering proper code in
16.03
16.03
16.03
} DROOP RATE
Drooping
Speed Controller
Output / %
100%
23.17 KPS VAL MIN FREQ and
16.03
16.03
16.03
FbEq
PASS CODE.
1 = 1
PASS CODE.
1 = 1%
PASS CODE.
1 = 1 ms
Drive load
10 = 1%
23.18 TIS
PASS CODE.
1 = 1 Hz
PASS CODE.
1 = 1 Hz
PASS CODE.