User manual

5
PV
0
Dead band:dead
band width:positive
Dead band:dead
band width:negative
PV
0
Output
Heating Cooling
Set Point
Output
Heating
Cooling
Set Point
Figure 5: PID control,
Dead band is positive
Figure 6: PID control,
Dead band is negative
Description of Function and Parameters Setting:
PID program control by 8 patterns (Pattern No. 0~7) is supported in DTB series. Each pattern
contains 8 steps (step No. 0 ~ 7), one Link Pattern parameter, one Cycle parameter and one
Actual Step parameter
Start Pattern:
is in operation mode and it is used to set the Start Pattern of PID program
control (This parameter appear in
mode only).
Steps: Include set point X and execution time T, these two parameters setting. The set point (SV)
should reach temperature X after the period of execution time T. If the set point is the same as the
result of the previous setting, then it is called Soak program control. If not, then it is called Ramp
program control. Therefore, PID program control is also called Ramp/Soak program control.
The default of step No. 0 in this controller is Soak program control. The controller will control the
temperature (PV) to reach the set point X and then keep the temperature at set point X. The period
of execution time is time T which provided by step No. 0.
Link Pattern Parameter: For example, when set
to 2, it indicates that pattern No. 2 will
execute next after the execution of pattern No. 0. If set to , it indicates the program will stop
after executing the current pattern and the temperature will keep at the set point of the last step.
Cycle Parameter: Additional execution cycle number. For example, when set
to 2, it
indicates that pattern No. 4 should execute twice in addition. Include origin one time execution,
total execute three times.
Actual Step Parameter: Execution step number per pattern (can set to 0 ~ 7). For example, when
set
to 2, it indicates that pattern No 7 will not execute other steps than step 0 to step2.
Execution: When
is set to , the program will start to execute in order from the step 0
of start pattern.
When
is set to , the program will stop and the control output is disabled.
When
is set to , the program will stop and the temperature at that time will be
controlled at the set point before program stop. Select
again, then the program will restart
and execute from step 0 of start pattern.
When
is set to , the program will hold and the temperature at that time will be
controlled at the set point before program hold. Select
again, then the program will follow
the step before hold and start to execute through the rest of the time.
Retransmission Output:
When the 1
st
group output of this controller is linear voltage or current output, it can be
Retransmission that is the output variation corresponding with input. For example, when read