Delta MS300 Series User Manual page 303

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Chapter 12 Description of Parameter SettingsMS300
Integral time (I):
The controller output is proportional to the integral of the controller input. To eliminate the
steady-state error, an "integral part" needs to be added to the controller. The integral time
decides the relation between integral part and error. The integral part will be increased by time
even if the error is small. It gradually increases the controller output to eliminate the error until it
is 0. In this way a system can be stable without steady-state error by proportional gain control
and integral time control.
Differential control (D):
The controller output is proportional to the differential of the controller input. During elimination
of the error, oscillation or instability may occur. The differential control can be used to suppress
these effects by acting before the error. That is, when the error is near 0, the differential control
should be 0. Proportional gain (P) + differential control (D) can be used to improve the system
state during PID adjustment.
4. When PID control is used in a constant pressure pump feedback application:
Set the application's constant pressure value (bar) to be the set point of PID control. The
pressure sensor will send the actual value as PID feedback value. After comparing the PID set
point and PID feedback, there will be an error. Thus, the PID controller needs to calculate the
output by using proportional gain (P), integral time (I) and differential time (D) to control the
pump. It controls the drive to have different pump speed and achieves constant pressure control
by using a 4-20 mA signal corresponding to 0-10 bar as feedback to the drive.
R(L1)
S(L2)
T(L3)
 Pr. 00-04 is set to 10 (Display PID analog feedback signal value (b) (%))
 Pr. 01-12 Acceleration Time will be set as required
 Pr. 01-13 Deceleration Time will be set as required
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no fuse breaker
( NFB)
R(L1)
S( L2)
T(L3)
analog si gnal common
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U(T 1)
V(T2)
W(T 3)
F eedback 4-20mA
cor responds
0-10bar
ACI/A VI
(4- 20mA /0- 10V )
ACM
12.1-08-2
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water pump
IM
3~
throttle
pressure
sensor
DC
- +
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