6. OPERATION
Parameter Setting
At the basic display, press and hold for about 2
seconds to access
Field Parameter Table
. Press
to proceed to next parameter. Press , or to
modify values. Press to decrease the value.
Press to increase the value. There is a dot flashing
while the value is changing just like a cursor. Hold
the keys will speed up the value changing speed, as
well as the flashing frequency of the cursor.
Press to move the designated digit position.
Press to save and proceed to the next parameter.
Hold to scroll down the parameter table quickly.
Press and hold more than 2 seconds goes back
to the previous parameter. Press and hold (don’t
release) plus simultaneously escape parameter
setting back to
Basic Display
. The instrument will
automatically escape to
Basic Display
if no key is
pressed for 25 seconds but any change made to the
last parameter will not be saved.
Short-cut Keys
Certain frequently used operations can be done by
short-cut keys. Those keys can be disabled.
Changing SV:
Press , or to change.
Auto-tuning (AT):
Press and hold for about 2 sec-
onds until “At” shows up. Press to toggle “oFF” to
“on” in the lower display. Press to start auto-tun-
ing. The lower display will flash “At”. After two
oscillating cycles in “ON-OFF” control mode, PID
parameters will be calculated. To quit auto-turn-
ing, perform the same operation by pressing for
2 seconds. Change “on” to “oFF” and press to
confirm to quit.
Note
1. Advanced artificial intelligent technology and PID regulating algo-
rithm by AI-710JM, which is named as “APID” is able to overcome the
overshoot issue by standard PID algorithm.
2. PID values vary from different system. Before activating the
auto-tuning, set point value, SV, should be set at the commonly
used value or mean value. Set the SV to a maximum one if the heat
isolation of a furnace is good. SV value is not allowed to be changed
during auto-tuning. The time required for this process may takes
seconds to hours.
3. Control Hysteresis, CHYS, affects the result of auto-tuning too.
Generally the least the CHYS, the higher is the PID auto-tuning accu-
racy. However low CHYS value may cause incorrect ON-OFF output
during fluctuating input. CHYS=2.0 is recommended.
4. The PID values may not give the best performance immediately
after the auto-tuning is finished. The performance will gradually
improve over some time because there is a learning feature.
5. Regardless of auto-tuning or manual tuning, the control period, Ctl,
will be limited not longer than 3 seconds, no matter what value it is
set previously, to increase the accuracy and to provide better response
time (manual tuning).
5. DISPLAY
Basic Display
When the instrument is powered, the upper display
and lower display show the model number and firm-
ware version respectively. After around 3 seconds,
the displays show the process value (PV) and set
value (SV) respectively. This basic display remains
until there is a key pressed.
System Message
Following warning or status message may show up.
Symbol
Description
orAL
Out-of-range alarm due to incorrent
input specification / Input wires
disconnected / Broken thermocouple
/ Short-circuited input
#
HIAL
High limit alarm*
LoAL
Low limit alarm*
HdAL
Deviation high alarm*
LdAL
Deviation low alarm*
EErr
Internal data lost. Factory repair
required.
StoP
The instrument is in STOP status. No
output is given out.
* The alarm messages can be turned off by setting parameter AdIS to
oFF.
# When orAL appeared, the instrument will cut off the output after
a while.
