E5AX-LA/-MA
E5AX-LA/-MA
11
Control Output Value:
o
When the Digital Controller enters level 2, the control output value is
displayed on the SV display in a range of 0.0% to 100.0%.
Input Type:
in–t
When
in–t
is displayed on the PV display, the present setting of the
input type selector (SW206), is displayed on the SV display. The fol-
lowing table shows the messages that may be displayed:
Model
Display
Sensor
E5AX-LA
cur
1
4 to 20 mA
cur
2
0 to 20 mA
uol
1
1 to 5 V
uol
2
0 to 5 V
uol
3
0 to 1 V
E5AX-MA
uol
1
0 to 100 mV
uol
2
0 to 10 mV
uol
3
–10 to 10 mV
Alarm Mode:
al–1
,
al–2
When
al
is displayed on the PV display in level 2, alarm output mode
or the present setting of the corresponding alarm mode selector is
displayed on the SV display. The following table shows the mes-
sages that may be displayed.
Display
Alarm mode
No display
No alarm
)––(
Upper- and lower-limit alarm
–––(
Upper-limit alarm
)–––
Lower-limit alarm
–()–
Upper- and lower-limit range
alarm
3––e
Upper- and lower-limit alarms
with standby sequence
–––e
Upper-limit alarm with standby
sequence
3–––
Lower-limit alarm with standby
sequence
1––c
Absolute-value alarm
pro
Proportional alarm
Starting Control Operation
The E5AX will start control operations as soon as power is turned on
until power is turned off. If you don’t want control operations to be
performed while setting parameters, turn off the power and then turn
it back on after setting the desired parameters.
Auto-tuning
When the Level Key and Mode Key are pressed simultaneously for
1 second minimum, the Digital Controller automatically starts tuning
the PID constants. While auto-tuning is in operation, the auto-tuning
indicator on the front panel will flash. The Digital Controller executes
control based on the set PID constants (factory set to P = 10.0% FS,
I = 240 seconds, and D = 60 seconds) until process value of the con-
trolled system reaches main setting. After that, the Digital Controller
automatically adjusts the PID constants using the limit cycle meth-
od. When the auto-tuning indicator turns off, the auto-tuning is termi-
nated and PID constants are renewed.
Main
setting
Previous PID
constants
New PID constants
AT indicator flashes
Limit cycle method: The optimum PID constants are calculated by
this method by varying the control output variable and generating
external oscillation.
Auto-tuning can be carried out regardless of whether the Digital
Controller is performing reverse or normal operation. To stop auto-
tuning, hold down the Level Key and Mode Key again simultaneous-
ly for 1 second minimum. All settings will return to those prior to the
beginning of auto-tuning. Automatic tuning can be executed at any
time: at power application, while the temperature is rising, or after
the control action has stabilized.