APPENDIX
E5EK
A-- 16
F Startup Conditions of DT
(1) DT will start if the temperature that has been stable varies due to
external disturbance and the deflection of the temperature exceeds
the stable range, and then the temperature becomes stable, pro-
vided that the number of maximum temperature values is less than
four.
(2) DT will start if the set point is changed under the condition that
SRT does not start and the temperature becomes stable, provided
that the number of maxi mum temperature values is less than four.
If there are four or more maximum temperature values, HT will
start.
Temperature
Extreme value 2
SP
Set point change
Extreme value 1
Time
F Startup Conditions of HT
HT will be ON when there is hunting with four or more maximum tem-
perature values(extreme values) while SRT is not being executed.
Temperature
Extreme value 2
SP
Extreme value 4
Extreme
value 1
Time
Extreme
value 3
Note: In specific applications where temperature varies periodically due
to disturbance, internal parameters need to be adjusted.
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