Processing chambers might have huge capacities causing long AT calculation times in temperature controllers like E5_C and E5_N. So the question is what is the maximum AT execution time?
Explanation: The AT will be cancelled when T0 or T1 or T2 or T3 will be longer than AT truncation time.
The AT truncation time of E5_N is 9,999 s, and for E5_C is 19,999 s (5 hrs 33 min.19 secs.)
Note: "AT truncation time" is not the generally used term.
AT wave form of TC:
The limitation of the AT period comes from the maximum setting value of Integral time (I).
When T1 or T2 or T3 would be longer than the AT truncation time, the calculated Integral time value will be bigger than the maximum Integral time setting value. Then the AT should be truncated.
The maximum Integral time setting value of E5_C is 9,999 s, which is bigger than the E5_N's: 3,999 s.
Therefore the AT truncation time of E5_C is longer than the E5_N.
In case the AT is executed correctly and the calculated "I" value exceeds the maximum "I" setting value, "I" value as the AT result is set to the maximum "I" setting value.
Note however, if the RT (Robust Tuning) function is ON or the "Integral/Derivative Time Unit" is set to "0.1" then the maximum "I" setting value becomes one-tenth: 999.9 s, but the AT truncation time is still 19,999 s.
In the very slow thermal processes, if the discrepancy between appropriate "I" value and the "I" value set by AT is becoming very large, the "Integral/Derivative Time Unit" should be set to "1".
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