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4.7
PID Setting
In light of different environmental conditions of data centers, the PID parameter values must
Path:
Proportional constant (P)
Adjust according to the error between the measured temperature and the set value.
Integration constant (I)
output.
Differential constant (D)
Adjust the output according to the error change so as to correct the time-dependent
correction rate.
The PID default values of the three-way ball valve are shown as follows:
P
9.00
Adjustment procedures
The adjustment is made based on an open circuit method as follows:
1
high, medium, and low openings of the three-way ball valve from the control panel.
2
opening is too large (above 70%), reduce it to a medium opening (about 50%).
3
When the temperature and humidity of outlet air and return air are stable, record the
5.2 Control Panel Operation to get familiar with basic operation.
Force Mode
P Gain
I Gain
D Gain
(Figure 4-7 : Setting of PID Values)
I
0.55
:
OFF
:
09.00
:
0.550
:
0.000
D
0.000
33
Chapter 4
Initial Startup
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