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243
CHAPTER 4 FUNCTIONS
4
4.20 Simultaneous Temperature Rise Function
(c) Condition for the simultaneous temperature rise AT
The simultaneous temperature rise parameter is calculated when all the following conditions are satisfied after
the procedure described on Page 242, Section 4.20 (5) (a)is executed:
• When the module is in the PID control (all of the proportional band (P), integral time (I), and derivative time
(D) are not 0)
• When the temperature process value (PV) has been stable for two minutes or longer just before the
simultaneous temperature rise AT is executed.
• When the temperature process value (PV) is within the temperature measurement range just before the
simultaneous temperature rise AT is executed. If the temperature process value (PV) goes outside the range
after the simultaneous temperature rise AT is executed, the auto tuning ends in fail. For the operation of the
Q64TCN in that situation, refer to Page 186, Section 4.6 (8) (b).
• When CH Output variation limiter setting (Un\G44, Un\G76, Un\G108, Un\G140) is set to 0. ( Page
112, Section 3.4.2 (20))
If all the conditions described above are not satisfied, the simultaneous temperature rise parameter is not
calculated. Only PID constants are calculated.
The following shows how the Q64TCN operates when the simultaneous temperature rise AT has not been
executed.
The Q64TCN turns CH Simultaneous temperature rise AT disable status (b2 of Un\G573, Un\G605,
Un\G637, Un\G669) to 1 (ON). With CH Auto tuning status (Xn4 to Xn7) on, the module performs the same
processing as normal auto tuning.
Control status
CH Auto tuning instruction
(Yn4 to Yn7)
CH Simultaneous temperature rise
AT disable status
(b2 of Un\G573, Un\G605, Un\G637, Un\G669)
CH Auto tuning status
(Xn4 to Xn7)
OFF
PID control Auto tuning PID control
OFF
OFF
ON
ON
ON
Executed in a sequence program
Executed by the Q64TCN