Delta C2000 Series User Manual page 392

08 High-function PID Parameters
Input Terminal for PID Feedback
Settings
Negative feedback means: +target value – feedback. It is used for the detection value will be
increased by increasing the output frequency.
When Pr.03-00 to Pr.03-02 have the same setting, then the AVI will be the prioritized selection.
Positive feedback means: -target value + feedback. It is used for the detection value will be
decreased by increasing the output frequency.
When Pr08-00 7 neither 8, input value is disabled. The value of the setting remain the same
after the derive is off.
Common applications for PID control
Flow control: A flow sensor is used to feedback the flow data and performs accurate flow
control.
Pressure control: A pressure sensor is used to feedback the pressure data and performs
precise pressure control.
Air volume control: An air volume sensor is used to feedback the air volume data to have
excellent air volume regulation.
Temperature control: A thermocouple or thermistor is used to feedback temperature data for
comfortable temperature control.
Speed control: A speed sensor or encoder is used to feedback motor shaft speed or input
another machines speed as a target value for closed loop speed control of master-slave
operation. Pr.10.00 sets the PID set point source (target value).
PID control operates with the feedback signal as set by Pr.10.01 either 0~+10V voltage or
4-20mA current.
PID control loop:
K
p
0: No function
1: Negative PID feedback: on analogue input acc. To setting 5 of Pr. 03-00 to
Pr.03-02.
2: Negative PID feedback from PG card (Pr.10-02, skip direction)
3: Negative PID feedback from PG card (Pr.10-02)
4: Positive PID feedback from external terminal AVI (Pr.03-00)
5: Positive PID feedback from PG card (Pr.10-02, skip direction)
6: Positive PID feedback from PG card (Pr.10-02)
7: Negative PID feeback from communication protocol
8: Positive PID feedback from communication protocol
drive execute PID control output value
¨
Setpoint
+
K (1
p
-
feedback signal
: Proportional gain(P)
: Integral time(I)
T
i
Chapter 12 Description of Parameter Settings C2000 Series
This parameter can be set during operation.
¿¥
1
T S )
d
T S
i
sensor
: Derivative c ontrol(D)
T
d
12-08-1
Factory Setting:0
IM
: O perator