ABB ACS550 Series, User Manual

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166 ACS550 User’s Manual
Parameters
4027 PID 1 PARAM SET
Process PID (PID1) has two separate sets of parameters, PID set 1 and PID set 2.
• PID set 1 uses parameters 4001…4026.
• PID set 2 uses parameters 4101…4126.
PID
1
PARAM SET
defines which set is selected.
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 =
TIMED FUNC
1…4 – Defines the Timed function as the control for the PID Set selection (Timed function de-
activated = PID Set 1; Timed function activated = PID Set 2)
• See Group 36: TIMED FUNCTIONS .
12 = 2-
ZONE MIN
– The drive calculates the difference between setpoint 1 and feedback 1 as well as setpoint 2 and
feedback 2. The drive will control the zone (and select the set) that has a larger difference.
• A positive difference (a setpoint higher than the feedback) is always larger than a negative difference. 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 calculates the difference between setpoint 1 and feedback 1 as well as setpoint 2 and
feedback 2. The drive will control the zone (and select the set) that has a smaller difference.
• A negative difference (a setpoint lower than the feedback) is always smaller than a positive difference. 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 difference between setpoint 1 and feedback 1 as well as setpoint 2 and
feedback 2. In addition, it 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.
-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.
Code Description