25
●
Startup method
●
Stop method
Change
C
t
R
l
from 1 to 2. This fixes the PID values. PID values can also be changed
by key entry.
6-3
Cautions During Self-tuning
Observe the following when using the self-tuning function:
• Turn heaters or other control devices ON before turning the controller ON.
• To turn a control device OFF, set the controller to the READY mode. When turning a
control device back ON again, set the controller to the RUN mode.
• When the power is turned OFF during self-tuning while the LED blinks, the control
constants used during tuning are not stored in controller memory.
If any of the above mistakes have been made, unsuitable control constants are stored to
memory, which may result in unexpected control. If this happens, follow the procedure
below to reset the controller.
RDY
PV
SP
0
C
t
R
L
RDY
PV
SP
0
2
0
RDY
PV
SP
2
0
0
5
0
RDY
PV
SP
1
C
t
R
L
Parameter mode
Operation mode
PARA
PARA
Check that the control device
(heater, etc.) is ON and in an
operating state.
Hold down the key for
3 seconds to advance to the
parameter mode.
The parameter mode is
displayed.
Use the , and
keys to enter numeric values.
Hold down the key for
3 seconds twice to advance to
the operation mode.
Use the , and
key to set the SP value to the
desired temperature.
Self-tuning is automatically started for PV value
disturbances and SP changes whenever necessary.
Procedure
C
T
R
L
is displayed.
0
is displayed.
(default: ON/OFF operation)
The
C
T
R
L
value changes from
0
to
1
.
Self-tuning starts (LED starts
blinking) simultaneously with SP
value input.
When SP reaches the PV value,
tuning stops and the LED goes out
to indicate that self-tuning has
stopped.
1
2
3
4
5
6
Chapter 6 TUNING
