ABB ACQ550-x1-06A6-2 User Manual page 149

ACQ550-U1 User's Manual
Code Description
Analog input reference correction
Parameter values 9, 10 and 14...17 use the formula in the following table.
Value setting
C + B C value + (B value - 50% of reference value)
C * B C value · (B value / 50% of reference value)
C - B (C value + 50% of reference value) - B value
C / B (C value · 50% of reference value) / B value
Where:
• C = Main reference value
( = for values 9, 10 and
COMM
= 1 for values 14...17)
AI
• B = Correcting reference
( = 1 for values 9, 10 and
AI
= 2 for values 14...17).
AI
Example:
The figure shows the reference source curves for
value settings 9, 10 and 14...17, where:
• C = 25%.
• P 4012
SETPOINT MIN
• P 4013
SETPOINT MAX
• B varies along the horizontal axis.
4011 INTERNAL SETPNT
Sets a constant value used for the process reference.
• Units and scale are defined by parameters 4006 and 4007.
4012 SETPOINT MIN
Sets the minimum value for the reference signal source.
• See parameter 4010.
4013 SETPOINT MAX
Sets the maximum value for the reference signal source.
• See parameter 4010.
4014 FBK SEL
Defines the PID controller feedback (actual signal).
• You can define a combination of two actual values (
• Use parameter 4016 to define the source for actual value 1 (
• Use parameter 4017 to define the source for actual value 2 (
1 = 1 – Actual value 1 (
ACT
2 = 1- 2 –
ACT ACT ACT
3 = 1+ 2 –
ACT ACT ACT
4 = 1 * 2 –
ACT ACT ACT
5 = 1/ 2 –
ACT ACT ACT
6 = ( 1,2) – The smaller of
MIN ACT
7 = ( 1,2) – The greater of
MAX ACT
8 = sqrt( 1-2) – Square root of the value for
ACT
9 = sq 1+sq 2 – Square root of
A A
10 = sqrt( 1) – Square root of
ACT
11 = 1 – Signal 0158
COMM FBK
12 = 2 – Signal 0159
COMM FBK
13 = ( 1,2) – The average of
AVE ACT
4015 FBK MULTIPLIER
Defines an extra multiplier for the PID feedback value FBK defined by parameter 4014.
• Used mainly in applications where the flow is calculated from the pressure difference.
0.000 = – The parameter has no effect (1.000 used as the multiplier).
NOT SEL
-32.768...32.767 – Multiplier applied to the signal defined by parameter 4014
Example: FBK Multiplier
=
Calculation of the AI reference
= 0.
= 0.
1) provides the feedback signal.
ACT
1 minus 2 provides the feedback signal.
ACT
1 plus 2 provides the feedback signal.
ACT
1 times 2 provides the feedback signal.
ACT
1 divided by 2 provides the feedback signal.
ACT
1 or 2 provides the feedback signal.
ACT ACT
1 or 2 provides the feedback signal.
ACT ACT
ACT
1 plus the square root of
ACT
1 provides the feedback signal.
ACT
PID COMM VALUE
PID COMM VALUE
1 and
ACT ACT

A1 A2
–
120
17 (/)
100
80
60
40
20
0
0
1 and 2) as the feedback signal.
ACT ACT
1).
ACT
2).
ACT
1 minus 2 provides the feedback signal.
ACT
2 provides the feedback signal.
ACT
1 provides the feedback signal.
2 provides the feedback signal.
2 provides the feedback signal.
100%
.
FBK SEL
Parameters
149
9, 14 (+)
10, 15 ( * )
16 (-)
B