Speed Control - ABB ACS800 Series Firmware Manual

No. Name/Value
22.07 E-STOP RAMP TIME
0.0...1000.0 s
22.08 VARIABLE SLOPE
NO
YES
22.09 VAR SLOPE RATE
10.0...1000.0 ms
22.10 CNSTSPD (JOG) RAMP
0.0...1000.0 s

23 SPEED CONTROL

23.01 GAIN
0.0...250.0
Description
Defines the time inside which the drive is stopped if the drive receives
an emergency stop command.
The emergency stop command can be given through a fieldbus or an
Emergency Stop module (optional). Consult the local ABB
representative for more information on the optional module and the
related settings of the Standard Control Program.
Deceleration time.
Variable slope is used to smooth the speed reference step changes
from an overriding controller. If the overriding controller is generating
the ramped speed reference to the drive (not using the internal drive
ramp), the cycle time of the controller may cause the reference to be
"stepped" instead of smooth. When the drive sees a speed step, it
responds with a torque step that may upset the process. To
compensate for the stepped reference, the drive can ramp the
reference from the current to the new step, using the
SLOPE RATE as the time.
Note: Visible only after entering proper code in
Variable slope is not active.
Variable slope is active.
Cycle time of the overriding controller.
Note: Visible only after entering proper code in
Setting range.
Ramp time for constant speeds.
Note: This only applies when
STRT W/CNST.
Setting range.
Speed controller variables. See section
page 36.
Defines a relative gain for the speed controller. Great gain may cause
speed oscillation.
The figure below shows the speed controller output after an error step
when the error remains constant.
%
Controller
output = K · e
p
Note: The gain shown here is a calculated value based on
23.20 P-GAIN AT MIN and
Gain.
22.09
16.03
16.03
12.08 CNST SPD RUN SEL is set to
Speed controller tuning
Gain = K = 1
p
T = Integration time = 0
I
T = Derivation time = 0
D
Error Value
Controller Output
23.21 P-GAIN AT MAX.
Actual signals and parameters
FbEq
10 = 1 s
VAR
PASS CODE.
0
65535
PASS CODE.
10 = 1 ms
10 = 1 s
on
e = Error value
t
100 = 1
85