ABB ACQ580 - Page 219

Parameters 215
40.09 Set 1 feedback 2
source
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 40.08 Set 1 feedback 1
source.
Not selected
40.10 Set 1 feedback
function
Defines how process feedback is calculated from the two
feedback sources selected by parameters 40.08 Set 1
feedback 1 source and 40.09 Set 1 feedback 2 source.
The result of the function (for any selection) is multiplied by
parameter 40.90 Set 1 feedback multiplier. (That is why in
selections 12 and 13, the multiplier k is constant 1.)
In1
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
k*sqrt(In1) Square root of source 1. (k = 1) 12
k*sqrt(In1-In2) Square root of (source 1 - source 2). (k = 1) 13
40.11 Set 1 feedback filter
time
Defines the filter time constant for process feedback. 0.000 s
0.000…30.000 s Feedback filter time. 1 = 1 s
40.14 Set 1 setpoint
scaling
Defines, together with parameter 40.15 Set 1 output scaling,
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 scaling.
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.
0.00
-200000.00…
200000.00
Scaling. 1 = 1
No. Name/Value Description Def/FbEq16