14
or C (Cooling)
Set output %: in parameter
【
Operation Mode
】
, PV screen displays “oUt‘x’”, ‘x’ is 1 (output 1) or 2 (output 2)
FUZZY Mode:
This comprises 2 parts: PID parameters and Fuzzy exclusive parameters. Since Fuzzy control is calculated based
on P.I.D values of PID control, the user must first set P.I.D parameters or perform auto tuning (AT) to produce these parameters. In
addition, Fuzzy control includes the following 2 exclusive parameters.
a
、
Fuzzy Gain Setting: altering this value will directly affect the calculation of Fuzzy gain. Increasing this value will directly
enhance the Fuzzy control; decreasing this value will weaken the Fuzzy control. It is recommended that this value shall be
decreased for systems with slow reaction to heating/cooling. This value may be increased for systems with quick reaction to
heating/ cooling.
b
、
Set Fuzzy DeadBand: The effective bandwidth of Fuzzy control, when PV value enters into the range of SV-FZDB
<PV<SV+FZDB, Fuzzy control will stop calculation. I.e., when the PV is within this temperature range, its Fuzzy control is
fixed.
Set parameter
to
in
【
Initial Setting Mode
】
Set Fuzzy Gain: Set value of Fuzzy Gain by parameter
in
【
Regulation Mode
】
.
Set Fuzzy DeadBand: Set value of Fuzzy DeadBand by
parameter in
【
Regulation Mode
】
.
Setting of multiple PID sets
When PID control is selected, the system provides 6 sets (PID 0~5) PID parameter sets (P, I, D and IOF parameter) to be selected by the
user. In general conditions, one set of PID (P0) is adequate. For different setting values (SV), when the same PID value is not adequate
to control the precision, the user may set up multiple sets of PID parameters for the system to automatically switch-over to an applicable
PID set.
Set only one PID set:
Set parameter
to 0 (PID 0, the first set) in
【
Regulation Mode
】
, set parameter
to ON; at this time, the System starts to
Auto Fine-tune the PID value. During the calculation, AT LED lights up in the display panel. When the PV value generates 2 curves of
temperature oscillation based on the SV value, the AT process is completed and the AT LED in the panel goes out. The calculated PID
parameters are displayed in
,
,
,
and
, of which their content can be revised by the user.
Automatic switching-over Multiple PID sets:
Set parameter
to 0 (PID 0, the first set) in
【
Regulation Mode
】
, set the required SV value (e.g. 100 degree), set parameter
as ON; on completion of auto fine-tuning, the system fills in parameters
=100,
,
,
and
automatically, their content can be revised by the user.
Set parameter
to 1 (PID 1, the second set), set the required SV value (e.g. 150 degree), set parameter
as ON; on
completion of auto fine-tuning, the system fills in parameters
=150,
,
,
and
automatically.
Set parameter
to AUTO, System will verify on its own whether the current SV value is closer to parameter
or
,
and load the corresponding PID set automatically. E.g., if SV=110, system will load
parameters. If SV=140, system will load
parameters.
If more SV groups are required, PID2~PID5 can be set up with the same sequence as described above.
Tune Function
This machine provides 2 tuning methods (Auto_Tuning and Self_Tuning) for automatic generation of PID parameters (only applicable
when control mode is set to PID control).
Auto_Tuning: by full output of heating or cooling, temperature is allowed to oscillate up and down. Attain parameters of the
magnitude and period, calculate P, I, D, IOF parameters; in addition, save the temperature setting value for performing AT, for the
use of PID control. After Auto_Tuning, PID control will be carried out automatically.
Set parameter
to
in
【
Initial Setting Mode
】
AT setting: Set parameter
to
in
【
Regulation Mode
】
Self_Tuning: By full output of heating or cooling, max. slope of temperature alteration and system delay can be attained from the
Temperature-Time Curve, and P, I, D, IOF parameters can be calculated. Self tuning can be carried out in RUN mode and in STOP
mode. In the RUN mode, PID parameters are allowed to be updated when the machine is running; in the STOP mode, PID
parameters for the SV value can be attained.
Set parameter
to
in
【
Initial Setting Mode
】
ST Setting: set parameter
to
in
【
Regulation Mode
】
Set Reverse Output
output 1 reverse setting: Set a value corresponding to Y position by parameter
in
【
Initial Setting Mode
】
, such as xxxY (Y
can be 0 or 1; 0: forward; 1: reverse)
