ABB ACH550-UH-011A-6 User Manual page 165

PID control feedback source selection
Code Description
4010 SET POINT SEL
Defines the reference signal source for the PID controller.
• Parameter has no significance when the PID regulator is by-passed
(see 8121
8 = – Fieldbus provides reference.
COMM
9 = +
COMM AI
combination as the reference source. See
correction
10 =
COMM AI
*
combination as the reference source. See
correction
Analogue input reference correction
Parameter values 9, 10, and 14...17 use the formula in the following
table.
Value setting Calculation of the AI reference
C + B
C * B
C - B
C / B
Where:
• C = Main reference value
(= for values 9, 10 and =
COMM
• B = Correcting reference
(= 1 for values 9, 10 and =
AI
Example: The figure
shows the reference
source curves for
value settings 9, 10,
and 14...17, where:
• C = 25%.
• P 4012
SETPOINT
= 0.
MIN
• P 4013
SETPOINT
= 0.
MAX
• B varies along the
horizontal axis.
4014 FBK SEL
Defines the PID controller feedback (actual signal).
11 =
COMM FBK
feedback signal.
12 =
COMM FBK
feedback signal.
160
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).
REG BYPASS CTRL
1 – Defines a fieldbus and analogue input 1 (
on page 160.
1 – Defines a fieldbus and analogue input 1 (
on page 160.
C value + (B value - 50% of reference value)
C value · (B value / 50% of reference value)
(C value + 50% of reference value) - B value
(C value · 50% of reference value) / B value
AI
120
100
80
60
40
20
0
0
1 – Signal 0158
PID COMM VALUE
2 – Signal 0159
PID COMM VALUE
ACH550-01 User's Manual
Range
0...19
Analogue input reference
Analogue input reference
1 for values 14...17)
AI
2 for values 14...17).
17 (/)
1...13
1 provides the
2 provides the
Serial communications
1)
AI
1)
AI
9, 14 (+)
10, 15 ( * )
16 (-)
B
100%