Parameters 313
Selects the second source of process feedback.
For the selections, see parameter
Defines how process feedback is calculated from the two
feedback sources selected by parameters
.
In1
Source 1.
0
In1+In2
Sum of sources 1 and 2.
1
In1-In2
Source 2 subtracted from source 1.
2
In1*In2
Source 1 multiplied by source 2.
3
In1/In2
Source 1 divided by source 2.
4
MIN(In1,In2)
Smaller of the two sources.
5
MAX(In1,In2)
Greater of the two sources.
6
AVE(In1,In2)
Average of the two sources.
7
sqrt(In1)
Square root of source 1.
8
sqrt(In1-In2)
Square root of (source 1 - source 2).
9
sqrt(In1+In2)
Square root of (source 1 + source 2).
10
sqrt(In1)+sqrt(In2)
Square root of source 1 + square root of source 2.
11
Defines the filter time constant for process feedback.
0.000 s
0.000 … 30.000 s
Feedback filter time.
1 = 1 s
Defines the unit for parameters
rpm
rpm.
7
%
%.
4
Hz
Hz.
3
PID user unit 1
User-definable unit 1. The name of the unit can be edited on
the control panel by choosing Menu – Settings – Edit texts.
250
Defines, together with parameter
general scaling factor for the process PID control chain.
The scaling can be utilized when, for example, the process
setpoint is input in Hz, and the output of the PID controller is
used as an rpm value in speed control. In this case, this
parameter might be set to 50, and parameter
to the
nominal motor speed at 50 Hz.
In effect, the output of the PID controller = [
] when
deviation (setpoint - feedback) = [
] and [
] = 1.
Note:
The scaling is based on the ratio between
. For example, the values 50 and 1500 would produce
the same scaling as 1 and 30.
100.00
-32768.00 …
32767.00
Process setpoint base.
1 = 1
See parameter
1500.00;
1800.00
(
b0)
-32768.00 …
32767.00
Process PID controller output base.
1 = 1
No.
Name/Value
Description
Def
/
FbEq16
Summary of Contents for ACS880-x04
Page 1: ... ABB INDUSTRIAL DRIVES ACS880 primary control program Firmware manual ...
Page 4: ......
Page 18: ...18 Using the control panel ...
Page 24: ...24 Control locations and operating modes ...
Page 112: ...112 Application macros ...
Page 496: ...496 Additional parameter data ...
Page 544: ...544 Fault tracing ...
Page 602: ...602 Control chain diagrams ...