ABB ACS550 Series, User Manual

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168 ACS550 User’s Manual
Parameters
Group 42: EXT / TRIM PID
This group defines the parameters used for the second PID controller (PID2), which
is used for the External / Trimming PID.
The operation of parameters 4201
…
4221 is analogous with Process PID set 1
(PID1) parameters 4001…4021.
Code Description
4201
…
4221
See 4001 …4021
4228 ACTIVATE
Defines the source for enabling the external PID function.
• Requires 4230
TRIM MODE
= 0 (
NOT SEL
).
0 =
NOT SEL
– Disables external PID control.
1 =
DI
1 – Defines digital input
DI
1 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 =
DI
2…
DI
6 – Defines digital input
DI
2…
DI
6 as the control for enabling external PID control.
• See
DI
1 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 =
TIMED FUNC
1…4 – Defines the Timed function as the control for enabling external PID control (Timed
function active enables external PID control).
• See Group 36: TIMED FUNCTIONS .
-1 =
DI
1(
INV
) – Defines an inverted digital input
DI
1 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 =
DI
2(
INV
)…
DI
6(
INV
) – Defines an inverted digital input
DI
2…
DI
6 as the control for enabling external PID control.
• See
DI
1(
INV
) above.
4229 OFFSET
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 active when 4230
TRIM MODE
= 0 (trim mode is not active).
4230 TRIM MODE
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
Defines the multiplier (as a percent, plus or minus) used in the trim mode.