7.7 OUT2 (Heating/Cooling control) action (When setting Overlap band)
Heating P-band
Cooling P-band
Cycle action is performed according to deviation.
Non-contact
relay output
(OUT2)
Overlap
band
OFF
ON
OFF
ON
Control action
SV setting
Heating
action
(Cooling
action)
7
6
Cycle action is performed according to deviation.
Relay contact
output (OUT1)
7
6
7
6
5
3
5
3
5
3
(OUT2) Yellow
(OUT1) Green
Indication
Lit
Indication
Lit
Unlit
Unlit
: Acts ON (lit) or OFF (unlit).
: Represents Heating control action.
: Represents Cooling control action.
8. PID auto-tuning of this controller
In order to set each value of P, I, D and ARW automatically, fluctuation is applied to the controlled object
to get an optimal value. One of 3 types of fluctuation below is automatically selected.
(1) When the difference between the setting value and processing temperature is large as the
temperature rises.
When AT bias is set to 20 ( ), fluctuation is applied at the temperature 20 lower than the setting value.
15
(1)
(2)
(3)
(4)
Temperature
Setting value
(1) Calculating PID constant
(2) PID constant calculated
(3) Controlled by the PID constant
set
by auto-tuning.
(4) AT bias value
AT starting point
Time
(1)
(2) When the control is stable or when control temperature is within ±20 ( ) of setting value.
(2)
(3)
(4)
Setting value
Temperature
Temperature 20
(
) lower
than the setting value
Fluctuation is applied at the setting value.
(1) Calculating PID constant
(2) PID constant calculated
(3) Controlled by the PID constant
set
by auto-tuning.
AT starting point
Time
(1)
(2)
(3)
Temperature
Setting value
(3) When the control temperature is 20 ( ) or higher than the setting value.
When AT bias is set to 20
( ), fluctuation is applied at the temperature 20 ( ) higher than the
setting value.
Temperature 20
(
) higher
than the setting value
(1) Calculating PID
constant
(2) PID constant calculated
(3) Controlled by the PID constant
set
by auto-tuning.
(4) AT bias value
AT starting point
Time