ABB ACH550-01 User Manual page 157

ACH550 User's Manual
Code Description
Analog 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.
Serial communications
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
Range
17 (/)
9, 14 (+)
10, 15 (*)
16 (-)
B
100%
145