Yudian AI Series

12
5. PARAMETERS AND SETTINGS
5.1 The Full Parameter Table
Code Name Description
Setting
Range
HIAL High limit alarm
Alarm is triggered when PV (Process Value) >HIAL;
alarm is released when PV<HIAL-dF;
To disable high limit alarm, set HIAL=9999
Every alarm can be defined to control AL1,AL2,AU1,AU2
-1999～
+9999
units or
1℃
LoAL Low limit alarm
Alarm triggered when PV<LoAL;
alarm released when PV>LoAL+dF
Set LoAL =-1999 can disable low limit alarm
dHAL
Deviation high
alarm
Alarm triggered when PV-SV>dHAL;
alarm released when PV-SV<dHAL-dF
Set HdAL=9999 can disable deviation high alarm.
When on/off control mode is used, dHAL and dLAL is for second high alarm
and low alarm.
0～9999
units or
0～
999.9℃
dLAL
Deviation low
alarm
Alarm triggered when SV-PV>dLAL;
alarm released when SV-PV<dLAL-dF
Set dHAL=9999,when temperature is 999.9C,alarm is cancelled
dF
Alarm
hysteresis
Avoid frequent alarm on-off action because of the fluctuation of PV
E.g.: Set HIAL>800C,dF=2.0C
1. in normal status,when HIAL>800C, it alarms
2. in high alarm status, when PV<798C, alarms is cancelled
E.g: Set SV=700c,,dF=2.0C for heating
1.in run status,when PV>700C, it breaks
2.in stop status, when PV<698C, it reheats.
For on/off control mode,,the hgiher dF, the longer period,the lower accuracy.dF
won’t influence AI control. But when do AT, not to make too
high dF. The
adviced dF is 2-3times to PV.
0～2000
units or
0.1℃
CtrL Control mode
CtrL=0: on-off control. For situation not requiring high precision;
CtrL=1: AI MPt control. Allowed to quick activate auto-tuning (pressing
in basic display status.)
CtrL=2: AI MPt control. Activate auto-tuning.
CtrL=3: After auto-
tuning finished, the instrument automatically set CtrL=3, and
quick auto-tuning function is disabled.
CtrL=4: Comparing with the control mode of CtrL=3, Parameter P is defined as
10 times as its original value. Ex., if set P=5 incase of Ctrl=3 and set P=50
incase of Ctrl=5, then these 2 setting have then same control effect. In the
application of rapidly changed temperature (changes by more than 100℃
/second), pr
essure or flow control, or in the application where inverter is used
to control water pressure, P is often very small, even smaller than 1. If CtrL is
set to 4, then parameter P can be enlarged 10 times, and so finer control is
obtained.
0～4