ABB ACQ580 Firmware Manual page 219

No. Name/Value
40.09 Set 1 feedback 2
source
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)
k*sqrt(In1)
k*sqrt(In1-In2)
40.11 Set 1 feedback filter
time
0.000...30.000 s
40.14 Set 1 setpoint
scaling
-200000.00...
200000.00
Description
Selects the second source of process feedback. The second
source is used only if the setpoint function requires two
inputs.
For the selections, see parameter
source.
Defines how process feedback is calculated from the two
feedback sources selected by parameters
feedback 1 source and 40.09 Set 1 feedback 2
The result of the function (for any selection) is multiplied by
parameter 40.90 Set 1 feedback
selections 12 and 13, the multiplier k is constant 1.)
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.
Square root of source 1. (k = 1)
Square root of (source 1 - source 2). (k = 1)
Defines the filter time constant for process feedback.
Feedback filter time.
Defines, together with parameter
a general scaling factor for the process PID control chain.
If the parameter is set to zero, automatic setpoint scaling is
activated, where suitable setpoint scale is calculated
according to selected setpoint source. Actual setpoint scale is
shown in parameter 40.61 Setpoint actual
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
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
40.15. For example, the values 50 and 1500 would produce
the same scaling as 1 and 30.
Scaling.
Parameters 215
40.08 Set 1 feedback 1
40.08 Set 1
source.
multiplier. (That is why in
40.15 Set 1 output scaling,
scaling.
40.15 to the
40.14 and
Def/FbEq16
Not selected
In1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
0.000 s
1 = 1 s
0.00
1 = 1