ABB ACH550-01 User Manual page 294

ACH550-01 User's Manual
Code Description
4027 PID 1 PARAM SET
Process PID (PID1) has two separate sets of parameters, PID set 1 and
PID set 2.
PID
• PID set 1 uses parameters 4001...4026.
• PID set 2 uses parameters 4101...4126.
0 = 1 – PID set 1 (parameters 4001...4026) is active.
SET
1 = 1 – Defines digital input
DI
• Activating the digital input selects PID set 2.
• De-activating the digital input selects PID set 1.
2...6 = 2...
DI DI
set selection.
• See 1 above.
DI
7 = 2 – PID set 2 (parameters 4101...4126) is active.
SET
8...11 =
TIMER
selection (Timer de-activated = PID set 1; Timer activated = PID set
2)
• See parameter
-1 = 1( ) – Defines an inverted digital input
DI INV
set selection.
• Activating the digital input selects PID set 1.
• De-activating the digital input selects PID set 2.
-2...-6 = 2(
DI INV
as the control for PID set selection.
• See 1(
DI INV
For 2- selections (12...14), the drive first calculates the difference
ZONE
between PID1 set 1 setpoint and feedback (deviation) as well as the
difference between PID1 set 2 setpoint and feedback (deviation).
12 = 2-
ZONE MIN
PID1 set 1 or PID1 set 2) which has a larger deviation.
• A positive deviation (a setpoint higher than the feedback) is always
larger than a negative deviation. This keeps feedback values at or
above the setpoint.
• Controller does not react to the situation of feedback above setpoint
if another zone's feedback is closer to its setpoint.
13 = 2-
ZONE MAX
PID1 set 1 or PID1 set 2) which has a smaller deviation.
• A negative deviation (a setpoint lower than the feedback) is always
smaller than a positive deviation. This keeps feedback values at or
below the setpoint.
• Controller does not react to the situation of feedback below setpoint
if another zone's feedback is closer to its setpoint.
14 = 2-
ZONE AVE
and uses it to control zone 1. Therefore one feedback is kept above
its setpoint and another is kept as much below its setpoint.
Parameter listing and descriptions
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1 defines which set is selected.
PARAM SET
1 as the control for PID set selection.
DI
6 – Defines digital input
1...4 – Defines the timer as the control for the PID set
Group 36: TIMED
)... 6( ) – Defines an inverted digital input
DI INV
) above.
– The drive will control the zone (and select the set,
– The drive will control the zone (and select the set,
– The drive calculates the average of the deviations,
Range
-6...11
2... 6 as the control for PID
DI DI
FUNCTIONS.
1 as the control for PID
DI
2... 6
DI DI
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