Delta CT2000 Series User Manual page 318

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.
 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:
Setpoint
: Proportional gain(P)
K
p
Chapter 12 Description of Parameter SettingsCT2000 Series
0: No function
1: Negative PID feedback: input from external terminal AVI (Pr.03-00)
2: Negative PID feedback from PG card (Pr.10-15, skip direction)
3: Negative PID feedback from PG card (Pr.10-15)
4: Positive PID feedback from external terminal AVI (Pr.03-00)
5: Positive PID feedback from PG card (Pr.10-15, skip direction)
6: Positive PID feedback from PG card (Pr.10-15)
7: Negative PID feeback from communication protocol
8: Positive PID feedback from communication protocol
drive execute PID control
¨
+

K (1
p
-
feedback signal
: Integral time(I)
T
i
12.1-08-1
 This parameter can be set during operation.
output value
¿¥
1
 
T S )
 d
T S
i
sensor
: Derivative control(D)
T
d
Factory Setting:0
IM
: O perator