Auto Tuning - LABBOX LBX MF12 MUFU-020-001 Manual Del Usuario

1.4 Auto tuning:

When auto tuning control method is chosen, the PID parameters can be obtained by running auto-tuning. In
basal display status, press
from "oFF" to "on", then press
on-off control. After 2-3 times of on-off action, the instrument will obtain the optimal control parameter value.
If you want to escape from auto tuning status, press and hold the
parameter appear again. Change "At" from "on" to "oFF", press
be cancelled.
Note1 : If the setpoint is different, the parameters obtained from auto-tuning are possibly different. So
you'd better set setpoint to an often-used value or middle value first, and then start auto-tuning.
Depending on the system, the auto-tuning time can be from several seconds to several hours.
Note2: Setting of CHYS may have influence on AT. The lower value of CHYS the higher accuracy. But too low
CHYS isn't advice, CHYS=2.0 is adviced.
Note3: At the beginning after AT, the result maybe not table but it will get best result after a time.
2. Parameter setting
In basic display status, press
will move to the next parameter; pressing
can return to the preceding parameter. Press
escape from the parameter table. The instrument will escape automatically from the parameter table if no
key is pressed within 30 seconds. Setting Loc=808 and then press
Field parameter table (Press
Code Name
HIAL High limit alarm
LoAL Lower limit alarm
Deviation high
HdAL
alarm
LdAL Deviation low alarm Alarm on when PV-SV<LdA; alarm off when PV-SV>HdA-AHY
for 2 seconds, the "At" parameter will appear. Press
to active the auto-tuning process. During auto tuning, the instrument executes
and hold for about 2 seconds to access the Field Parameter Table. Pressing
and hold for 2 seconds to access)
Alarm on when PV (Process Value) >HIA; alarm off when
PV<HIA-AHY
Alarm on when PV (Process Value) <LoA; alarm off when
PV>LoA-AHY
Alarm on when PV-SV>HdA; alarm off when PV-SV<HdA-AHY
key for about 2 seconds until the "At"
to confirm, then the auto tuning process will
、
or can modify a parameter. Press and hold
(don't release) and then press
Description
6
to change the value of "At"
key simultaneously to
can access System Parameter Table.
Factory value
3000
-999
50
-999