User Manual

7
5. Self-tuning of PID
When the temperature control effect is not ideal, a system self-tuning can be carried out where the
equipment will automatically configurate its PID parameters. To do that, follow the next instructions:
-
Press AT for 6s  the controller will run the auto-tuning function. The AT indicator will flash.
-
To stop the process, press AT for 6s while it is running.
-
During the process, the SET button does not work, and the lower window always displays the
temperature set value.
6. Internal parameters setting
6.1. How to enter
To adjust the internal parameters, you must enter the required password. To do that, follow these
instructions:
1. Press SET for 3s  the controller will display the password prompt Lc .
2. Use ◄ ▼▲ to choose the required value (see the password values below).
3. Press SET to enter  the controller will enter the internal parameters setting state.
To return to the regular state at any time, press SET for 3s.
6.2. Parameter tables
INDICATOR
NAME
INSTRUCTIONS OF THE FUNCTION
(RANGE)
DEFAULT VALUE
Lc Password
The password
to modify
the
parameters
in this
table is
Lc = 3
0
ALH
Over-temp
alarm
If SV > (SP + ALH) , the ALM light turns on. The buzzer
sounds and the heating output turns off.
(0
～
100.0
℃
)
20.0
ALL
Under-temp
alarm
If SV < (SP – ALL) , the ALM light flashes, the buzzer
sounds.
(0
～
100.0
℃
)
0
T
Control cycle The temperature control cycle.
(1
～
60S)
5
P
Proportional
band
Adjustment of proportional function.
(1
～
400.0
℃
)
35.0
I
Integration
time
Adjustment of integration function.
(1
～
2000S)
200
d
Differential
time
Adjustment of differential function.
(0
～
1000S)
200
Pb
Zero point
adjustment
When
the
error
is
comparatively
larger,
this
value
might
need adjustment.
Pb = actual value – measure value
(-12.0
～
12.0
℃
)
0
PK
Large value
adjustment
Correction
of errors
caused
by
sensor
high
temperature
values.
actual value
-
measured value
PK
=
1000
×
measured value
(-999
～
999)
0