ABB ACQ550-x1-06A6-2 - Page 149

ACQ550-U1 User’s Manual 149
Parameters
Analog input reference correction
Parameter values 9, 10 and 14…17 use the formula in the following table.
Where:
• C = Main reference value
( =
COMM for values 9, 10 and
=
AI1 for values 14…17)
• B = Correcting reference
( =
AI1 for values 9, 10 and
=
AI2 for values 14…17).
Example:
The figure shows the reference source curves for
value settings 9, 10 and 14…17, where:
•C = 25%.
• P 4012
SETPOINT MIN = 0.
• P 4013
SETPOINT MAX = 0.
• 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 (ACT1 and ACT2) as the feedback signal.
• Use parameter 4016 to define the source for actual value 1 (
ACT1).
• Use parameter 4017 to define the source for actual value 2 (
ACT2).
1 =
ACT1 – Actual value 1 (ACT1) provides the feedback signal.
2 =
ACT1-ACT2 – ACT1 minus ACT2 provides the feedback signal.
3 =
ACT1+ACT2 – ACT1 plus ACT2 provides the feedback signal.
4 =
ACT1
*
ACT2 – ACT1 times ACT2 provides the feedback signal.
5 =
ACT1/ACT2 – ACT1 divided by ACT2 provides the feedback signal.
6 =
MIN(ACT1,2) – The smaller of ACT1 or ACT2 provides the feedback signal.
7 =
MAX(ACT1,2) – The greater of ACT1 or ACT2 provides the feedback signal.
8 = sqrt(
ACT1-2) – Square root of the value for ACT1 minus ACT2 provides the feedback signal.
9 = sq
A1+sqA2 – Square root of ACT1 plus the square root of ACT2 provides the feedback signal.
10 = sqrt(
ACT1) – Square root of ACT1 provides the feedback signal.
11 =
COMM FBK 1 – Signal 0158 PID COMM VALUE 1 provides the feedback signal.
12 =
COMM FBK 2 – Signal 0159 PID COMM VALUE 2 provides the feedback signal.
13 =
AVE(ACT1,2) – The average of ACT1 and ACT2 provides the feedback signal.
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 =
NOT SEL – The parameter has no effect (1.000 used as the multiplier).
-32.768…32.767 – Multiplier applied to the signal defined by parameter 4014
FBK SEL.
Example:
Code Description
Value setting Calculation of the AI reference
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
120
100
80
60
40
20
0
0
100%
9, 14 (+)
16 (-)
10, 15 (
*
)
17 (/)
B
FBK Multiplier A1 A2–=