ABB ACS880 Firmware Manual page 422

422 Parameters
No. Name / Range /
Selection
40.10 Set 1 feedback
function
In1
In1+In2
In1-In2
In1*In2
In1/In2
MIN(In1,In2)
MAX(In1,In2)
AVE(In1,In2)
sqrt(In1)
sqrt(In1-In2)
sqrt(In1+In2)
sqrt(In1)+sqrt(In2)
40.11 Set 1 feedback filter
time
0.000 ... 30.000 s
40.12 Set 1 unit selection
rpm
%
Hz
PID user unit 1
40.14 Set 1 setpoint
scaling
-32768.00 ...
32767.00
Description
Defines how process feedback is calculated from the
two feedback sources selected by parameters
1 feedback 1 source and
Source 1.
Sum of sources 1 and 2.
Source 2 subtracted from source 1.
Source 1 multiplied by source 2.
Source 1 divided by source 2.
Smaller of the two sources.
Greater of the two sources.
Average of the two sources.
Square root of source 1.
Square root of (source 1 - source 2).
Square root of (source 1 + source 2).
Square root of source 1 + square root of source 2.
Defines the filter time constant for process feedback.
Feedback filter time.
Defines the unit for parameters 40.01...40.05,
40.21...40.24 and 40.47.
rpm.
%.
Hz.
User-definable unit 1. The name of the unit can be
edited on the control panel by choosing Menu – Settings
– Edit texts.
Defines, together with parameter
scaling, a 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 40.15 to the nominal motor speed at 50 Hz.
In effect, the output of the PID controller = [40.15] when
deviation (setpoint - feedback) = [40.14] and [40.32] =
1.
Note: The scaling is based on the ratio between
and 40.15. For example, the values 50 and 1500 would
produce the same scaling as 1 and 30.
Process setpoint base.
40.8 Set
40.9 Set 1 feedback 2 source.
40.15 Set 1 output
Def / Type
FbEq 16b / 32b
In1 / uint16
0
1
2
3
4
5
6
7
8
9
10
11
0.000 s / real32
1 = 1 s / 1000 = 1 s
% / uint16
7
4
3
250
100.00 / real32
40.14
1 = 1 / 100 = 1