2.2 b: Application
116
YASKAWA ELECTRIC
TOEP C710687 03B FSDrive-MV1000 Parameter Guide
n
PID Operation
To better demonstrate how PID works, the diagram below shows how the PID output changes when the PID input
(deviation) jumps from 0 to a constant level.
Figure 2.15
Figure 2.15 PID Operation
n
Using PID Control
Applications for PID control are listed in
Table 2.8 Using PID Control
n
PID Setpoint Input Methods
The PID setpoint input depends on the PID function setting in parameter b5-01.
If parameter b5-01 is set to 1 or 2, the frequency reference in b1-01 (or b1-15) or one of the inputs listed in
becomes the PID setpoint.
If b5-01 is set to 3 or 4, then the PID setpoint can be input from one of the sources listed in
.
Table 2.9 PID Setpoint Sources
Note:
A duplicate allocation of the PID setpoint input will cause an oPE alarm.
n
PID Feedback Input Methods
Input one feedback signal for normal PID control, or two feedback signals to control a differential process value.
Normal PID Feedback
The PID feedback signal can be input from one of the sources listed in
.
Table 2.10 PID Feedback Source
Note:
A duplicate allocation of the PID feedback input will result in an oPE alarm.
Application
Description
Sensors Used
Speed Control
Machinery speed is fed back and adjusted to meet the target value.
Synchronous control is performed using speed data from other machinery as the target value
Tachometer
Pressure
Maintains constant pressure using pressure feedback.
Pressure sensor
Fluid Control
Keeps flow at a constant level by feeding back flow data.
Flow rate sensor
Temperature
Control
Maintains a constant temperature by controlling a fan with a thermostat.
Thermocoupler, Thermistor
PID Setpoint Sources
Setting
Analog input 1
Set H3-02 = C
Analog input 2
Set H3-10 = C
MEMOBUS/Modbus Register 0006H
Set bit 1 in register 000FH to 1 and input the setpoint to register 0006H
Parameter b5-19
Set parameter b5-18 = 1 and input the PID setpoint to b5-19
PID Feedback Source
Setting
Analog input 1
Set H3-02 = B
Analog input 2
Set H3-10 = B
PID input
I control
PID Output
D control
Time
PID output
Time
P control
common_TMonly
MV1000ParameterGuide_E_conditional.book 116 ページ ２０１３年１０月１１日 金曜日 午後８時１８分
