Pid Control Macro - ABB ACS850 Firmware Manual

56 Application macros

PID control macro

The PID control macro is suitable for process control applications, for example
closed-loop pressure, level or flow control systems such as
• pressure boost pumps of municipal water supply systems
• level-controlling pumps of water reservoirs
• pressure boost pumps of district heating systems
• material flow control on a conveyor line.
The process reference signal is connected to analog input AI1 and the process
feedback signal to AI2.
Alternatively, a direct speed reference can be given to the drive through AI1. Then the
PID controller is bypassed and the drive no longer controls the process variable.
Selection between direct speed control and process variable control is done through
digital input DI3.
A constant speed (300 rpm) can be activated through DI4.
Default parameter settings for PID control macro
Below is a listing of default parameter values that differ from those listed in chapter
Additional parameter data
Parameter
No. Name
10.04 Ext2 start func
10.05 Ext2 start in1
10.10 Fault reset sel
12.01 Ext1/Ext2 sel
13.05 AI1 min scale
13.09 AI2 max scale
13.10 AI2 min scale
21.02 Speed ref2 sel
21.04 Speed ref1/2 sel
26.02 Const speed sel1
26.06 Const speed1
(page 203).
PID control macro
default
In1
DI6
C.FALSE
DI3
0.000
1500.000
0.000
PID out
DI3
DI4
300 rpm