ABB ACH550-01 User Manual page 287

Code Description
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.
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.
282
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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
1 for values 14...17)
AI
2 for values 14...17).
AI
120
100
80
60
40
20
0
0
Parameter listing and descriptions
ACH550-01 User's Manual
Range
17 (/)
unit and scale defined
by par 4006 and 4007
-500.0...500.0%
-500.0...500.0%
9, 14 (+)
10, 15 ( * )
16 (-)
B
100%