ABB DriveIT ACH550-UH - Group 42: External PID

ACH550-UH User’s Manual 123
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Group 42: External PID
This group defines the parameters used for the second PID controller (PID2) of
ACH550
The operation of parameters 4201…4221 is analogous with Process PID set 1
(PID1) parameters 4001…4021.
Group 42: External PID
Code Description Range Resolution Default S
4201
…
4221
See 4001 …4021
4228 ACTIVATE -6…12 - 0
Defines the source for enabling the external PID function.
• Requires 4230
TRIM MODE = 0 NOT SEL.
0 =
NOT SEL – Disables external PID control.
1 =
DI1 – Defines digital input DI1 as the control for enabling external PID control.
• Activating the digital input enables external PID control.
• De-activating the digital input disables external PID control.
2…6 =
DI2…DI6 – Defines digital input DI2…DI6 as the control for enabling external PID control.
•See
DI1 above.
7 =
DRIVE RUN – Defines the start command as the control for enabling external PID control.
• Activating the start command (drive is running) enables external PID control.
8 = ON – Defines the power-on as the control for enabling external PID control.
• Activating power to the drive enables external PID control.
9…12 = TIMER 1…4 – Defines the Timer as the control for enabling external PID control (Timer active enables
external PID control).
• See parameter Group 36: Timer Functions.
-1 =
DI1(INV) – Defines an inverted digital input DI1 as the control for enabling external PID control.
• Activating the digital input disables external PID control.
• De-activating the digital input enables external PID control.
-2…-6 =
DI2(INV)…DI6(INV) – Defines digital input DI2…DI6 as the control for enabling external PID control.
•See
DI1(INV) above.
4229 OFFSET 0.0…100.0% 0.1% 0.0%
Defines the offset for the PID output.
• When PID is activated, output starts from this value.
• When PID is deactivated, output resets to this value.
• Parameter is not active when 4230
TRIM MODE not = 0 (trim mode is active).
4230 TRIM MODE 0…2 1 0
Selects the type of trim, if any. Using the trim it is possible to combine a corrective factor to the drive reference.
0 =
NOT SEL – Disables the trim function.
1 =
PROPORTIONAL – Adds a trim factor that is proportional to the rpm/Hz reference.
2 =
DIRECT – Adds a trim factor based on the control loop’s maximum limit.
4231 TRIM SCALE -100.0%…100.0% 0.1% 0.0%
Defines the multiplier (as a percent, plus or minus) used in the trim mode.