ABB ACS850-04 series, Firmware Manual

Page: 162 / 296

162 Parameters
23.07 Speed err Ftime Defines the time constant of the speed error low pass filter.
If the used speed reference changes rapidly (like in a servo
application), the possible interferences in the speed
measurement can be filtered with the speed error filter.
Reducing the ripple with filter may cause speed controller
tuning problems. A long filter time constant and fast
acceleration time contradict one another. A very long filter
time results in unstable control.
0.0 … 1000.0 ms Speed error filtering time constant. 0 = filtering disabled. 10 = 1 ms
23.08 Speed additive Defines a speed reference to be added after ramping.
Note: For safety reasons, the additive is not applied when
stop functions are active.
Zero Zero speed additive. 0
AI1 scaled 02.05 AI1 scaled (see page 95 ). 1073742341
AI2 scaled 02.07 AI2 scaled (see page 95 ). 1073742343
FBA ref1 02.26 FBA main ref1 (see page 100 ). 1073742362
FBA ref2 02.27 FBA main ref2 (see page 100 ). 1073742363
D2D ref1 02.32 D2D ref1 (see page 101 ). 1073742368
D2D ref2 02.33 D2D ref2 (see page 101 ). 1073742369
PID out 04.05 Process PID out (see page 102 ). 1073742853
Pointer Value pointer setting (see Terms and abbreviations on page
93 ).
-
23.09 Max torq sp ctrl Defines the maximum speed controller output torque.
-1600.0 … 1600.0% Maximum speed controller output torque. 10 = 1%
23.10 Min torq sp ctrl Defines the minimum speed controller output torque.
-1600.0 … 1600.0% Minimum speed controller output torque. 10 = 1%
23.11 SpeedErr winFunc Enables or disables speed error window control.
Speed error window control forms a speed supervision
function for a torque-controlled drive. It supervises the speed
error value (speed reference – actual speed). In the normal
operating range, window control keeps the speed controller
input at zero. The speed controller is evoked only if
• the speed error exceeds the upper boundary of the window
(parameter 23.12 SpeedErr win hi ), or
• the absolute value of the negative speed error exceeds the
lower boundary of the window ( 23.13 SpeedErr win lo ).
When the speed error moves outside the window, the
exceeding part of the error value is connected to the speed
controller. The speed controller produces a reference term
relative to the input and gain of the speed controller
(parameter
23.01 Proport gain ) which the torque selector
adds to the torque reference. The result is used as the
internal torque reference for the drive.
Example: In a load loss condition, the internal torque
reference of the drive is decreased to prevent an excessive
rise of the motor speed. If window control were inactive, the
motor speed would rise until a speed limit of the drive were
reached.
Disabled Speed error window control inactive. 0
No. Name/Value Description FbEq