Yudian AI-526 - Page 36

31
P2
2
nd
Proportional
band
The 2
nd
proportional band in PID and APID control. Instead of percentage of the
measurement range, the unit is the same as PV.
Generally, optimal P, I, D and CtI can obtained by auto tuning. They can also be
manually inputted if you already know the correct values.
1~32000
units
I2
2
nd
Time of
Integral
No integral effect when I=0
0～9999
seconds
d2
2
nd
Time of
Derivative
No derivative effect when d=0
0～999.9
seconds
CtI2
2
nd
Control
period
Same description and function as parameter as “Ctl”
0.2～
300.0
Sec
CHYS
Control
Hysteresis
CHYS is used for on-off control to avoid frequent on-off action of relay.
For a reverse acting (heating) system, when PV > SV, output turns off; when
PV<SV-CHYS, output turns on.
For a direct acting (cooling) system, when PV<SV, output turns off; when
PV>SV+CHYS, output turns on.
0～2000