ABB ACS550 User Manual page 166

166
Code Description
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.
1 defines which set is selected.
PID PARAM SET
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... 6 – Defines digital input
DI DI
• See 1 above.
DI
7 = 2 – PID Set 2 (parameters 4101...4126) is active.
SET
8...11 =
TIMED FUNC
activated = PID Set 1; Timed function activated = PID Set 2)
• See Group 36: TIMED
12 = 2- – The drive calculates the difference between setpoint 1 and feedback 1 as well as setpoint 2 and
ZONE MIN
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- – The drive calculates the difference between setpoint 1 and feedback 1 as well as setpoint 2 and
ZONE MAX
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- – The drive calculates the difference between setpoint 1 and feedback 1 as well as setpoint 2 and
ZONE AVE
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 = 1( ) – Defines an inverted digital input
DI INV
• Activating the digital input selects PID Set 1.
• De-activating the digital input selects PID Set 2.
-2...-6 = 2( )...
DI INV DI
• See 1( ) above.
DI INV
Parameters
1 as the control for PID Set selection.
DI
2... 6 as the control for PID Set selection.
DI DI
1...4 – Defines the Timed function as the control for the PID Set selection (Timed function de-
FUNCTIONS.
6( ) – Defines an inverted digital input
INV
1 as the control for PID Set selection.
DI
2... 6 as the control for PID Set selection.
DI DI
ACS550 User's Manual