ABB ACH550-UH-011A-6 User Manual page 196

ACH550-01 User's Manual
Code Description
20 = (
KEYPAD
A Stop command resets the reference to zero (the
reset.). Changing the control source (
does not copy the reference.
21 = (
KEYPAD
Stop command does not reset the reference to zero. The reference is
stored. Changing the control source (
does not copy the reference.
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.
1104 REF1 MIN
Sets the minimum for external reference 1.
• The minimum analogue input signal (as a percentage of the full signal
in volts or amperes) corresponds to
• Parameter 1301
analogue input signal.
• These parameters (reference and analogue min. and max. settings)
provide scale and offset adjustment for the reference.
Parameter listing and descriptions
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) – Defines the control panel as the reference source.
RNC
) – Defines the control panel as the reference source. A
NC
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
2 for values 14...17).
AI
120
100
80
60
40
20
0
0
1 or 1304
MINIMUM AI
Range
R
1 to 2,
EXT EXT EXT
1 to 2,
EXT EXT EXT
1 for values 14...17).
AI
17 (/)
0...500 Hz /
0...30000 rpm
in Hz/rpm.
1
MIN
REF
2 sets the minimum
MINIMUM AI
stands for
2 to 1)
EXT
2 to 1)
EXT
9, 14 (+)
10, 15 ( * )
16 (-)
B
100%
191