13
PID Mode:
When set for heating or cooling, the program performs PID operation via input temperature and setting temperature,
with the operation result output for the temperature control. A PID parameter and control period must be set for this function; these
parameters can also be generated automatically via auto-tuning (AT).
a
、
A total of six sets of PID parameters are available, one of which can be selected for carrying out PID, and the program may
automatically select a set of PID that is most close to the input value. In order to achieve this, each set of PID parameters has
a reference input setting value which allows the user to set for manual setting or for auto-tuning (AT). E.G., for the six sets of
PID parameters as shown below, SV is reference input setting. Let us select the 4
th
set as the PID running parameter: i.e.,
P=40, I=220, D=55, IOF=30%. If we select AT to find the set closest to the setting value with a setting input of 230, the
program will automatically find the second set as the running parameter for PID operation.
0
1
2
3
4
5
SV
80
160
240
320
400
480
P
120
46
70
60
40
50
I
100
140
180
200
220
240
D
25
35
45
50
55
60
IOF
20
10
30
20
30
21
b
、
Set PID parameters and the control period: in which PID parameters can be adjusted manually according to system
characteristics or created automatically by AT, the pre-set integral value is set as I parameter
≠
0, allowing for promptly
achieving the setting value; unit is % output; proportional error compensation is: when I parameter is set to =0, for the
adjustment of reduced time to reach the temperature. The Control Period is the period of PID operation, if the control period is
10s, it means a PID operation is carried out every 10s. The result is then output to control the temperature. If the system
heats up quickly, the control period shall not be set too long. For relay output, the lifespan of the relay shall be considered; a
short period will shorten the lifespan of relay.
c
、
Coef and DeadBand are added in the PID parameter for double output (one for heating and one for cooling). Coef refers to
the ratio between the first and second portions of output (P parameter of second group =Coef*P, Coef= 0.01~99.99);
DeadBand is the overlapping temperature of the P output of the first group and the second group.
Set parameter
to
in
【
Initial Setting Mode
】
To set for heating or cooling control: Select desired output control by parameter
in
【
Initial Setting Mode
】
. If no
board is inserted in Output2, selection items are: H1, C1 (H for heating, C for cooling, 1 for output 1). If a board is inserted in
Output 2, selection items are: H1H2, C1H2… H1A2(H for heating, C for cooling, 1 for output 1, 2 for output 2, A for Alarm 3 )
Select number of PID sets as running parameter and set PID parameter: Select 0~5,
, by parameter
in
【
Regulation Mode
】
, then press
key to set the selected PID parameter including “SV‘x’”, ”P‘x’”, ”I‘x’”, ”d‘x’”, and ”ioF‘x’”,
where ‘x’ is the pre-selected set as the PID running parameter, which can be 0~5. “SV‘x’” is the reference temperature
setting value; “P‘x’”, ”I‘x’”, ”d‘x’”, ”ioF‘x’” correspond to P, I, D, and IOF.
Set the control period: in parameter
【
Regulation Mode
】
, PV displays “o‘x’-‘y’”, ‘x’ is 1(output 1) or 2 (output 2), ‘y’ is H(Heating)
or C (Cooling)
Set double output Coef: Set Coef value by parameter
in
【
Regulation Mode
】
Set DeadBand of double output: Set DeadBand zone by parameter
in
【
Regulation Mode
】
Set control to running mode: Set parameter
in
【
Operation Mode
】
to
.
Set AT: Set parameter
to
in
【
Regulation Mode
】
. The selected number of PID will be adjusted
automatically. After that, a pre-set parameter of integrated PID value will be created automatically and the display will
automatically alter into
.
Note: When performing AT, the entire system must complete setting; i.e. the input Sensor must be wired and correctly set, and the
output must be connected to a heater or cooler pipe.
MANUAL Mode:
Manual control function, may force output of a fixed value; normally operated by combining switchover of PID
control.
a
、
Switch from PID control to manual control: Control output will maintain the original control output before switching over to
manual control. E.g., if the control output before the PID calculation is 20%, then the control output after switching to manual
control is 20%. You may force a fixed output value after a switchover, for example: controlling the output to be 40%.
b
、
Switch from manual control to PID control: if manual control before switching-over to PID control is 40%, the program will
take 40% as the initial value for calculating the PID value and output the new control.
Note: If power of machine is switched off in manual control mood, the output % will be maintained when the power is switched on
again.
Set parameter
to
in
【
Initial Setting Mode
】
Set control period: in parameter
【
Regulation Mode
】
, PV displays “o‘x’-‘y’”, ‘x’ is 1 (output 1) or 2 (output 2), ‘y’ is H (Heating)
