ABB ACH550-02-645A-4 [197/454] Ach550 02 user s manual

ABB ACH550-02-645A-4 [197/454] Ach550 02 user s manual
Parameter listing and descriptions 193
ACH550-02 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 (
EXT1 to EXT2, EXT2 to EXT1)
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 (
EXT1 to EXT2, EXT2 to EXT1)
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 = AI1 for values 14…17).
B = Correcting reference
(=
AI1 for values 9, 10 and = AI2 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
REF1 MIN in Hz/rpm.
Parameter 1301
MINIMUM AI1 or 1304 MINIMUM AI2 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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