ABB ACH550 series, User Manual

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Parameter listing and descriptions 289
ACH550-01 User's Manual
4027 PID 1 PARAM SET -6…11
Process PID (PID1) has two separate sets of parameters, PID set 1 and
PID set 2.
PID
1
PARAM SET
defines which set is selected.
• PID set 1 uses parameters 4001…4026.
• PID set 2 uses parameters 4101…4126.
0 =
SET
1 – PID set 1 (parameters 4001…4026) is active.
1 =
DI
1 – Defines digital input
DI
1 as the control for PID set selection.
• Activating the digital input selects PID set 2.
• De-activating the digital input selects PID set 1.
2…6 =
DI
2…
DI
6 – Defines digital input
DI
2…
DI
6 as the control for PID
set selection.
• See
DI
1 above.
7 =
SET
2 – PID set 2 (parameters 4101…4126) is active.
8…11 =
TIMER
1…4 – Defines the timer as the control for the PID set
selection (Timer de-activated = PID set 1; Timer activated = PID set
2)
• See parameter
Group 36: TIMED FUNCTIONS .
-1 =
DI
1(
INV
) – Defines an inverted digital input
DI
1 as the control for PID
set selection.
• Activating the digital input selects PID set 1.
• De-activating the digital input selects PID set 2.
-2…-6 =
DI
2(
INV
)…
DI
6(
INV
) – Defines an inverted digital input
DI
2…
DI
6
as the control for PID set selection.
• See
DI
1(
INV
) above.
For 2-
ZONE
selections (12…14), the drive first calculates the difference
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
– The drive will control the zone (and select the set,
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
– The drive will control the zone (and select the set,
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
– The drive calculates the average of the deviations,
and uses it to control zone 1. Therefore one feedback is kept above
its setpoint and another is kept as much below its setpoint.
Code Description Range
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