58
8.2.2 Program Pattern Group (for Program Control)
Sets Step SV, Step time, Wait value and Event (EVT1, EVT4, EVT5) in this group.
A maximum of 15 steps of program pattern can be created.
This program pattern shows that the
temperature rises to 200 for 1 hour,
and stays at 200 for 2 hours.
In this case, Step 1 SV is 200 ,
and Step 1 time is 1 hour.
(Fig. 8.2.2-1)
[Wait function]
During the program control run, the program does not proceed to the next step
until the deviation between PV and SV enters SV Wait value at the end of step.
The STEP indicator flashes while the Wait function is working.
The Wait function is released on the condition that:
When program pattern is rising: PV is higher than SV- Wait value
When program pattern is falling: PV is lower than SV+ Wait value
Step
1
2
3
4
5
: PV
: Program pattern
: Program pattern delayed by T due to the Wait function
(Fig. 8.2.2-2)
Step number
1
2
200
0
1:00
2:00
C
C
Program control run
200
0
T
T
If PV becomes higher than 190 , the wait
function will be released and proceed to Step 2.
Wait value 10
As PV is not in the range of SV Wait value, the unit
is in Wait status, and does not proceed to Step 2.
The STEP indicator flashes during Wait action (T time).