ABB ACS350 Series, User Manual

Page: 102 / 314

Program features
102
Example
The drive runs a conveyor line. It is speed controlled but the line tension also needs
to be taken into account: If the measured tension exceeds the tension setpoint, the
speed will be slightly decreased, and vice versa.
To accomplish the desired speed correction, the user
• activates the trimming function and connects the tension setpoint and the
measured tension to it.
• tunes the trimming to a suitable level.
Programmable analog inputs
The drive has two programmable analog voltage/current inputs. The inputs can be
inverted, filtered and the maximum and minimum values can be adjusted. The
update cycle for the analog input is 8 ms (12 ms cycle once per second). The cycle
time is shorter when information is transferred to the application program (8 ms ->
2 ms).
Settings
Parameter Additional information
Group 11 REFERENCE SELECT AI as reference source
Group 13 ANALOGUE INPUTS Analog input processing
3001 , 3021 , 3022 , 3107 AI loss supervision
Group 35 MOTOR TEMP MEAS AI in motor temperature measurement
Group 40 PROCESS PID SET 1
.... 42 EXT / TRIM PID
AI as PID process control reference or actual value source
8420 , 8425 , 8426
8430, 8435, 8436
...
8490, 8495, 8496
AI as sequence programming reference or trigger signal
Drive rollers (pull)
Tension measurement
Speed controlled conveyor line
Add
Tension
measurement
Speed reference
Tension
setpoint
Trimmed
speed reference
Simplified block diagram
PID