Delta C200 Series User Manual page 210

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08 High-function PID Parameters
Input Terminal for PID Feedback
Settings 0: No function
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.
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:
Concept of PID control
1. Proportional gain(P):
the output is proportional to input. With only proportional gain control,
a steady-state error.
2. Integral time(I):
the controller output is proportional to the integral of the controller input. To eliminate the
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1: Negative PID feedback: input from external terminal AVI (Pr.03-00)
2: Reserved
3: Reserved
4: Positive PID feedback from external terminal AVI (Pr.03-00)
drive execute PID control output v alue
Setpoint
+
-
feedback signal
: Proportional gain(P)
K
p
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Chapter 11 Description of Parameter Settings|C200 Series
This parameter can be set during operation.
¨
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1
+ + ×
K (1 T S )
p × d
T S
i
sens or
: Integral time(I) : Derivative control(D)
T T
i d
11-111
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Factory Setting:0
IM
: O perator
there will always be
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