Process Pid Control - ABB ACS560 Firmware Manual

50 Program features
Example
If,
N1 = 300 rpm, defined by parameter
N2 = 600rpm, defined by parameter
OL1 = 10%, defined by parameter
OL2 = 20%, defined by parameter
Parameter 37.03
Overload axis = torque%, defined by parameter
Drive speed = 450 rpm,
the drive generates
(calculated by leaner interpolation between point (N1, OL1) and (N2, Ol2) for the
predefined time), after the time period mentioned in parameter
timer.
If the parameter 37.03
Settings
Parameter group 37 User load curve


Process PID control

There are two built-in process PID controllers (PID set 1 and PID set 2) in the drive.
The controller can be used to control process variables such as pressure or flow in
the pipe or fluid level in the container.
In process PID control, a process reference (setpoint) is connected to the drive
instead of a speed reference. An actual value (process feedback) is also brought
back to the drive. The process PID control adjusts the drive speed in order to keep
the measured process quantity (actual value) at the desired level (setpoint). This
means that user does not need to set a frequency/speed/torque reference to the drive
but the drive adjust its operation according to the process PID.
The simplified block diagram below illustrates the process PID control. For more
detailed block diagrams, see pages
= Warning
A8BE (Aux code 0001) warning, if the actual torque exceeds 15%
is set as Disabled, the drive does not generate any warning.
(page 292).
495
37.11 ULC speed table point 1
37.12 ULC speed table point 2
37.31 ULC overload point 1
37.32 ULC overload point 2
37.02 ULC supervision signal
and 498.
37.41 ULC overload