ABB ACS880-01 Series, Firmware Instructions

Page: 343 / 664

Parameters 343
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 .
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
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
40.12 Set 1 unit selection Defines the unit for parameters 40.01 … 40.05 , 40.21 … 40.24
and 40.47 .
%
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
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.
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.
100.00
-32768.00 …
32767.00 Process setpoint base. 1 = 1
40.15 Set 1 output scaling See parameter 40.14 Set 1 setpoint scaling . 1500.00;
1800.00
(
95.20 b0)
-32768.00 …
32767.00 Process PID controller output base. 1 = 1
40.16 Set 1 setpoint 1
source Selects the first source of process PID setpoint. This setpoint
is available in parameter
40.25 Set 1 setpoint selection as
setpoint 1. See the control chain diagram on page 658 .
Internal
setpoint
Not selected None. 0
No. Name/Value Description Def / FbEq16