54
Autotune Cycle Time:
Autotune calculates the optimum value but for safety reasons does
not automatically implement it. To see the calculated cycle time:
1 . Program for Function .4 Option 0, similar to the example in
Section 5.1.7.
2. Press once. To the left of the .4 Function code the
calculated cycle time will be displayed preceded by a “-”. To
accept this value, press P or ★.
3. To see the operational cycle time, press once. The new AT
operation cycle time will be displayed to the left of the .4
Function code.
5.1.8 Proportional Cycle Time
will be shown to the left of the numeral displays
when the operational value is displayed.
If the cycle time needed is shorter than the 20 second default
setting (e.g., 1 sec is generally used for driving an SSR and 0.05
sec is used for linear outputs), the user should select the
appropriate Option in Function .4. (Refer to Table 3-4). The cycle
time setting will not be changed automatically, but may be
replaced with the calculated AT value if preferred after the
Autotune run.
Normal Procedure
Run Autotune AT. When finished (alternating AT display stops)
display the AT calculated cycle time. If you want the displayed
value, lock it in (value replaces the previous cycle time setting).
Ensure that the jumper behind
the lower front bezel is in the
Parameter Setting position.
To convert the main display
from temperature read-out to
Function/Option Mode:
STEP ACTION DISPLAY
1
2
Press P
Function (flashing)
0.
0
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