ABB ACQ580 Firmware Manual page 231

No. Name/Value
40.70 Compensated
setpoint
-200000.00...
200000.00 PID
customer units
40.71 Set 1 compensation
input source
Not selected
Reserved
Internal setpoint
AI1 scaled
AI2 scaled
Reserved
Motor
potentiometer
Reserved
Freq in scaled
AI1 percent
AI2 percent
Reserved
Description
Compensated setpoint determined for the input specified by
parameter 40.71 Set 1 compensation input
The setpoint compensation can be used with long pipelines
where the distance between setpoint and sensor is long and
the friction losses need to be compensated to get the correct
value.
The determination of the compensated setpoint is based on
the curve specified by points (x1, y1), (x2, y2) and the non-
linearity of the curve specified with parameters 40.71...40.76.
The compensated setpoint curve will be a mixture of a
straight line between the points and a squared line between
the points:
y
a = -1
x1,y1
x = value from 40.71 Set 1 compensation input source
y = 40.70 Compensated setpoint
a = 40.76 Set 1 compensation non-linearity
Compensated setpoint curve = a
(1 - a) linear function
*
Compensated setpoint value.
Selects the source for set 1 compensation input.
None.
Internal setpoint. See parameter
sel1.
12.12 AI1 scaled value (see page 125).
12.22 AI2 scaled value (see page 126).
22.80 Motor potentiometer ref act
potentiometer).
11.39 Freq in 1 scaled value
12.101 AI1 percent value
12.102 AI2 percent value
source.
x2,y2
a = 0
a = 1
squared function +
*
40.19 Set 1 internal setpoint
(output of the motor
(see page 122).
(see page 127)
(see page 127)
Parameters 227
Def/FbEq16
x
1 = 1 PID
customer unit
Set1 output
min
0
1
2
3
4
5...7
8
9
10
11
12
13...14