ABB ACSM1 Series, Firmware Manual, Page: 113 / 334

Parameters and firmware blocks
113
26.04 SPEED FEED PCTRL FW block: SPEED ERROR (see above)
Selects the source for the speed reference feedforward in position and synchron control modes.
Selects the source for the speed reference in homing and profile velocity modes.
Note: This parameter is only for positioning applications.
Value pointer: Group and index
26.05 SPEED STEP FW block: SPEED ERROR (see above)
Defines an additional speed step given to the input of the speed controller (added to the speed error
value).
-30000…30000 rpm Speed step.
26.06 SPD ERR FTIME FW block: SPEED ERROR (see above)
Defines the time constant of the speed error low pass filter.
If the used speed reference changes rapidly (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.
See also parameter
22.02 SPEED ACT FTIME .
0…1000 ms Time constant for speed error low pass filter. 0 ms = filtering disabled.
26.07 SPEED WINDOW FW block: SPEED ERROR (see above)
Defines the absolute value for the motor speed window supervision, i.e. the absolute value for the
difference between the actual speed and the unramped speed reference (
1.01 SPEED ACT - 3.03
SPEEDREF RAMP IN ). When the motor speed is within the limits defined by this parameter, signal
2.13 bit 8 (AT_SETPOINT) value is 1. If the motor speed is not within the defined limits, bit 8 value
is 0.
0…30000 rpm Absolute value for motor speed window supervision.