ABB ACS550-01 - Page 76

76 ACS550 User’s Manual
Start-Up
5 = DI3U,4D(R) – Defines digital inputs as the speed reference source (motor potentiometer control).
• Digital input DI3 increases the speed (the U stands for “up”).
• Digital input DI4 decreases the speed (the D stands for “down”).
• A Stop command resets the reference to zero (the R stands for “reset”).
• Parameter 2205 ACCELER TIME 2 controls the reference signal’s rate of change.
6 = DI3U,4D – Same as above (DI3U,4D(R)), except:
• A Stop command does not reset the reference to zero. The reference is stored.
• When the drive restarts, the motor ramps up (at the selected acceleration rate) to the stored reference.
7 = DI5U,6D – Same as above (DI3U,4D), except that DI5 and DI6 are the digital inputs used.
8 = COMM – Defines the fieldbus as the reference source.
9 = COMM+AI1 – Defines a fieldbus and analog input 1 (AI1) combination as the reference source. See Analog Input
Reference Correction below.
10 = COMM*AI1 – Defines a fieldbus and analog input 1 (AI1) combination as the reference source. See Analog Input
Reference Correction below.
11 = DI3U, 4D(RNC) – Same as DI3U,4D(R) above, except that:
• Changing the control source (EXT1 to EXT2, EXT2 to EXT1, LOC to REM) does not copy the reference.
12 = DI3U,4D(NC) – Same as DI3U,4D above, except that:
• Changing the control source (EXT1 to EXT2, EXT2 to EXT1, LOC to REM) does not copy the reference.
13 = DI5U,6D(NC) – Same as DI5U,6D above, except that:
• Changing the control source (EXT1 to EXT2, EXT2 to EXT1, LOC to REM) does not copy the reference.
14 = AI1+AI2 – Defines an analog input 1 (AI1) and analog input 2 (AI2) combination as the reference source. See
Analog Input Reference Correction below.
15 = AI1*AI2 – Defines an analog input 1 (AI1) and analog input 2 (AI2) combination as the reference source. See
Analog Input Reference Correction below.
16 = AI1-AI2 – Defines an analog input 1 (AI1) and analog input 2 (AI2) combination as the reference source. See
Analog Input Reference Correction below.
17 = AI1/AI2 – Defines an analog input 1 (AI1) and analog input 2 (AI2) combination as the reference source. See
Analog Input Reference Correction below.
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.
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