ABB ACS880 - Page 422

Def / Type
FbEq 16b / 32b
DescriptionName / Range /
Selection
No.
In1 / uint16Defines how process feedback is calculated from the
two feedback sources selected by parameters 40.8 Set
1 feedback 1 source and 40.9 Set 1 feedback 2 source.
Set 1 feedback
function
40.10
0Source 1.In1
1Sum of sources 1 and 2.In1+In2
2Source 2 subtracted from source 1.In1-In2
3Source 1 multiplied by source 2.In1*In2
4Source 1 divided by source 2.In1/In2
5Smaller of the two sources.MIN(In1,In2)
6Greater of the two sources.MAX(In1,In2)
7Average of the two sources.AVE(In1,In2)
8Square root of source 1.sqrt(In1)
9Square root of (source 1 - source 2).sqrt(In1-In2)
10Square root of (source 1 + source 2).sqrt(In1+In2)
11Square root of source 1 + square root of source 2.sqrt(In1)+sqrt(In2)
0.000 s / real32Defines the filter time constant for process feedback.Set 1 feedback filter
time
40.11
1 = 1 s / 1000 = 1 sFeedback filter time.0.000 ... 30.000 s
% / uint16Defines the unit for parameters 40.01…40.05,
40.21…40.24 and 40.47.
Set 1 unit selection40.12
7rpm.rpm
4%.%
3Hz.Hz
250User-definable unit 1. The name of the unit can be
edited on the control panel by choosing Menu – Settings
– Edit texts.
PID user unit 1
100.00 / real32Defines, together with parameter 40.15 Set 1 output
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 40.14
and 40.15. For example, the values 50 and 1500 would
produce the same scaling as 1 and 30.
Set 1 setpoint
scaling
40.14
1 = 1 / 100 = 1Process setpoint base.-32768.00 ...
32767.00
422 Parameters