ABB ACS550-01 User Manual page 124

124
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 A A
7 = ( 1, 2) – The greater of
MAX A A
8 = ( 1- 2) – Square root of the value for
SQRT A A
9 = 1 + 2 – Square root of
SQA SQA
10 = ( 1) – Square root of
SQRT ACT
4015 FBK MULTIPLIER
Defines an extra multiplier for the PID FBK value defined by parameter 4014.
• Used mainly in applications where the flow is calculated from the pressure difference.
0 = .
NOT USED
-32.768...32.767 = Multiplier applied to the signal defined by parameter 4014
Example: FBK Multiplier
=
Start-Up
AI reference is calculated as following:
= 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
1 plus the square root of
ACT
1 provides the feedback signal.
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 ACT
2 provides the feedback signal.
ACT
ACS550 User's Manual
100%
.
FBK SEL
9, 14 (+)
10, 15 (*)
16 (-)
B