ABB DriveIT ACH550-UH - Page 118

118 ACH550-UH User’s Manual
Start-Up
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 -1000.0…1000.0% 0.1% 40.0%
Sets a constant value used for the process reference.
• Units and scale are defined by parameters 4006 and 4007.
4012 SETPOINT MIN -500.0%…500.0% 0.1% 0.0%
Sets the minimum value for the reference signal source. See parameter 4010.
4013 SETPOINT MAX -500.0%…500.0% 0.1% 100.0%
Sets the maximum value for the reference signal source. See parameter 4010.
4014 FBK SEL 1…10 1 1
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 (A1, A2) – The smaller of ACT1 or ACT2 provides the feedback signal.
7 =
MAX (A1, A2) – The greater of ACT1 or ACT2 provides the feedback signal.
8 =
SQRT (A1-A2) – Square root of the value for ACT1 minus ACT2 provides the feedback signal.
9 =
SQA1 + 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.
Group 40: Process PID Set 1
Code Description Range Resolution Default S
Value Setting AI reference is calculated as following:
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