ABB ACH550-VCR - Page 100

1-96 ACH550-UH User’s Manual
Parameters
Analog 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 0.0…500.0 Hz / 0.1 Hz / 0.0 Hz /
0…30000 rpm 1 rpm 0 rpm
Sets the minimum for external reference 1.
• The minimum analog input signal (as a percent 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 analog input signal.
• These parameters (reference and analog min. and max. settings) provide scale and offset adjustment for the
reference.
1105 REF1 MAX 0.0…500.0 Hz / 0.1 Hz / 60.0 Hz (US) /
0…30000 rpm 1 rpm 1800 rpm (US)
Sets the maximum for external reference 1.
• The maximum analog input signal (as a percent of full the signal in volts or amperes) corresponds to
REF1 MAX in
Hz/rpm.
• Parameter 1302 MAXIMUM AI1 or 1305 MAXIMUM AI2 sets the maximum analog input signal.
Group 11: Reference Select
Code Description Range Resolution Default S
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
Ext ref
Analog
P 1105
P 1104
P 1301
P 1302
input signal
P 1301
P 1302
input signal
Analog
Ext ref
or 1304
or 1305
or 1304
or 1305
(MAX)
(
MIN)
P 1105
P 1104
(
MAX)
(
MIN)