ABB DriveIT ACH550-UH - Page 65

ACH550-UH User’s Manual 65
Start-Up
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 amps) 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 amps) 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
AI reference is calculated as following:
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)