ABB DriveIT ACH550-01 User Manual page 279

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
C + B
C * B
C - B
C / B
Where:
• C = Main Reference value
( =
COMM
= 1 for values 14...17).
AI
120
100
80
60
40
20
0
0
• 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.
Parameter listing and descriptions
AI reference is calculated as following:
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
for values 9, 10 and
17 (/)
= 0.
= 0.
Range
9, 14 (+)
10, 15 (*)
16 (-)
B
100%
Unit and scale
defined by par
4006 and 4007
275