ABB ACH550-UH User Manual page 100

1-96
Code Description
Analog Input Reference Correction
Parameter values 9, 10 and 14...17 use the formula in the following table.
Value setting
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
Where:
• C = Main reference value
( = for values 9, 10 and
COMM
= 1 for values 14...17).
AI
• B = Correcting reference
( = 1 for values 9, 10 and
AI
= 2 for values 14...17).
AI
Example:
The figure shows the reference source curves for value
settings 9, 10 and 14...17, where:
• C = 25%.
• P 4012
SETPOINT MIN
• P 4013
SETPOINT MAX
• B varies along the horizontal axis.
1104 REF1 MIN
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
Hz/rpm.
• Parameter 1301
• These parameters (reference and analog min. and max. settings) provide scale and offset adjustment for the
reference.
Ext ref
P 1105
( )
MAX
P 1104
( )
MIN
P 1301
or 1304
1105 REF1 MAX
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
Hz/rpm.
• Parameter 1302
Parameters
Group 11: Reference Select
Range
Calculation of the AI reference
= 0.
= 0.
0.0...500.0 Hz /
0...30000 rpm
1 or 1304
MINIMUM AI MINIMUM AI
Analog
input signal
P 1302
or 1305
0.0...500.0 Hz /
0...30000 rpm
1 or 1305
MAXIMUM AI MAXIMUM AI
Resolution
120
100
80
60
40
20
0
0
0.1 Hz /
1 rpm
2 sets the minimum analog input signal.
Ext ref
P 1104
( )
MIN
P 1105
( )
MAX
P 1302
P 1301
or 1305
or 1304
0.1 Hz /
1 rpm
2 sets the maximum analog input signal.
ACH550-UH User's Manual
Default
17 (/)
9, 14 (+)
10, 15 ( * )
16 (-)
100%
0.0 Hz /
0 rpm
REF
Analog
input signal
60.0 Hz (US) /
1800 rpm (US)
REF
S
B
1 in
MIN
1 in
MAX