APPENDIX
E5CK
A--12
F
Balanced Status
If the process value is within the stable range for 60s when there is no out-
put,it is deemed that the temperature is balanced.
F
Startup Conditions of DT
(1) DT will start if the temperature that has been stable varies due to ex-
ternal disturbance and the deflection of the temperature exceeds the
stable range, and then the temperature becomes stable, provided 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 maximum 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 temper-
ature 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.
