ABB ACH550-UH-011A-6, User Manual

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Parameter listing and descriptions 191
ACH550-01 User's Manual
20 =
KEYPAD
(
RNC
) – Defines the control panel as the reference source.
A Stop command resets the reference to zero (the
R
stands for
reset.). Changing the control source (
EXT
1 to
EXT
2,
EXT
2 to
EXT
1)
does not copy the reference.
21 =
KEYPAD
(
NC
) – Defines the control panel as the reference source. A
Stop command does not reset the reference to zero. The reference is
stored. Changing the control source (
EXT
1 to
EXT
2,
EXT
2 to
EXT
1)
does not copy the reference.
Analogue input reference correction
Parameter values 9, 10, and 14…17 use the formula in the following
table.
Where:
• C = Main reference value
(=
COMM
for values 9, 10 and =
AI
1 for values 14…17).
• B = Correcting reference
(=
AI
1 for values 9, 10 and =
AI
2 for values 14…17).
Example: The figure
shows the reference
source curves for
value settings 9, 10,
and 14…17, where
:
• C = 25%.
• P 4012
SETPOINT
MIN
= 0.
• P 4013
SETPOINT
MAX
= 0.
• B varies along the
horizontal axis.
1104 REF1 MIN 0…500 Hz /
0…30000 rpm
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
REF
1
MIN
in Hz/rpm.
• Parameter 1301
MINIMUM AI
1 or 1304
MINIMUM AI
2 sets the minimum
analogue input signal.
• These parameters (reference and analogue min. and max. settings)
provide scale and offset adjustment for the reference.
Code Description Range
Value setting Calculation of the AI reference
C + B C value + (B value - 50% of reference value)
C * B C value · (B value / 50% of reference value)
C - B (C value + 50% of reference value) - B value
C / B (C value · 50% of reference value) / B value
120
100
80
60
40
20
0
0
100%
9, 14 (+)
16 (-)
10, 15 (*)
17 (/)
B
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