ABB ACH550-UH User Manual page 158
Ach550 series, hvac drives (1...550 hp), e-clipse bypass drives (1...400 hp), packaged drives with disconnect (1...550 hp)
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Code Description
4010 SET POINT SEL
Defines the reference signal source for the PID controller.
• Parameter has no significance when the PID regulator is by-passed (see 8121
0 =
– Control panel provides reference.
KEYPAD
1 =
1 – Analog input 1 provides reference.
AI
2 =
2 – Analog input 2 provides reference.
AI
8 =
– Fieldbus provides reference.
COMM
9 =
+
1 – Defines a fieldbus and analog input 1 (
COMM
AI
reference correction below.
10 =
1 – Defines a fieldbus and analog input 1 (
COMM
*
AI
reference correction below.
11 =
3
,4
(
) – Digital inputs, acting as a motor potentiometer control, provide reference.
DI
U
D
RNC
•
3 increases the speed (the U stands for "up")
DI
•
4 decreases the reference (the D stands for "down").
DI
• Parameter 2205
• R = Stop command resets the reference to zero.
• NC = Reference value is not copied.
12 =
3
,4
(
) – Same as
DI
U
D
NC
• Stop command does not reset reference to zero. At restart the motor ramps up, at the selected acceleration rate,
to the stored reference.
13 =
5
,6
(
) – Same as
DI
U
D
NC
• Uses digital inputs
14 =
1+
2 – Defines an analog input 1 (
AI
AI
Analog input reference correction below.
15 =
1 *
2 – Defines an analog input 1 (
AI
AI
Analog input reference correction below.
16 =
1-
2 – Defines an analog input 1 (
AI
AI
Analog input reference correction below.
17 =
1/
2 – Defines an analog input 1 (
AI
AI
Analog input reference correction below.
19 =
– A constant value set using parameter 4011 provides reference.
INTERNAL
20 =
2
– Defines PID controller 2 output (parameter 0127
PID
OUT
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.
Parameters
Group 40: Process PID Set 1
Range
0...2, 8...17, 19...20
2 controls the reference signal's rate of change.
ACCELER TIME
3
,4
(
) above, except:
DI
U
D
RNC
3
,4
(
) above, except:
DI
U
D
NC
5 and
6.
DI
DI
1) and analog input 2 (
AI
1) and analog input 2 (
AI
1) and analog input 2 (
AI
1) and analog input 2 (
AI
Calculation of the AI reference
= 0.
= 0.
Resolution
1
1) combination as the reference source. See Analog input
AI
1) combination as the reference source. See Analog input
AI
2) combination as the reference source. See
AI
2) combination as the reference source. See
AI
2) combination as the reference source. See
AI
2) combination as the reference source. See
AI
2
) as the reference source.
PID
OUTPUT
120
17 (/)
100
80
60
40
20
0
0
ACH550-UH User's Manual
Default
0 (
)
KEYPAD
).
REG BYPASS CTRL
9, 14 (+)
10, 15 ( * )
16 (-)
100%
S
B
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