Yaskawa Z1000U HVAC Matrix Bypass User Manual
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PID Operation
To better demonstrate PID functionality,
illustrates how the PID output changes when the PID input (deviation)
jumps from 0 to a constant level.
PID input
I control
PID Output
D control
Time
PID output
Time
P control
Figure 5.10 PID Operation
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Using PID Control
Applications for PID control are listed in
.
Table 5.2 Using PID Control
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
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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, the frequency reference source in b1-01 or one of the inputs listed in
becomes the PID
setpoint.
If b5-01 is set to 3, then the PID setpoint can be input from one of the sources listed in
Table 5.3 PID Setpoint Sources
PID Setpoint Source
Settings
Analog Input A1
Set H3-02 = C
Analog Input A2
Set H3-10 = C
Analog Input A3
Set H3-06 = C
MEMOBUS/Modbus Register 0006 H
Set bit 1 in register 000F H to 1 and input the setpoint to register 0006 H
Pulse Input RP
Set H6-01 = 2
Parameter b5-19
Set parameter b5-18 = 1 and input the PID setpoint to b5-19
Note:
A duplicate allocation of the PID setpoint input will cause an oPE alarm.
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PID Feedback Input Methods
Input one feedback signal for normal PID control or input two feedback signals can for controlling a differential process value.
Normal PID Feedback
Input the PID feedback signal from one of the sources listed in
:
5.2 b: Application
YASKAWA SIEP YAIZ1D 01A Z1000U HVAC MATRIX Drive Bypass Technical Manual
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Programming