External Speed Correction; Settings - ABB ACS800 Firmware Manual

108

External speed correction

When the Synchro function is not used, you can use External speed correction.
Parameter
SPEED CORR BUFF. This speed correction bypasses internal ramps. The speed
correction value is added to the speed controller.
Example: To make an external device control the follower speed reference, for
example, through analogue input AI3, connect it to be the source for the reference:
97.16
The figure below illustrates the operation of the function.
Encoder
pulses
78.04 POS SCALE
Master
position
Position
error for
correction
(mm)

Settings

Parameter
Program features
97.16 SPD CORR PTR defines the correction by writing it to signal
SPD CORR PTR = 09.03.00
Homing
Actual
position
calculation
(mm)
78.01 SYNCRO CONTROL
Position
error limiter
(mm)
97.16 SPD CORR PTR
97.16
(09.03 AI3 SCALED).
02.21 POS
ACT PPU
10.14 SYNC SEL
Enable
Speed
correction
factor (rpm)
Position error
calculation
(mm)
Synchron.
03.35 SPEED CORR BUF
ADD
Speed
controller
loop
03.35
02.23 SYNC
POS ERROR