Table of Contents
Advertisement
(c) Conditions 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 202, Section 8.3.17 (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 failure. For the operation of
the temperature control module carried out when this happens, refer to the following.
Page 164, Section 8.3.7 (8) (b)
• When CH Output variation limiter setting (address: 107H, 137H, 167H, 197H) is set to 0. (Page 323,
Appendix 3 (11))
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 temperature control module operates when the simultaneous temperature rise AT
has not been executed.
CH□ Auto tuning instruction
(RY20 to RY23)
CH□ Auto tuning status
(RX20 to RX23)
Control status
CH□ Simultaneous temperature
rise AT disable status
(b2, b6, b10, b14 of RWr3)
The temperature control module turns CH Simultaneous temperature rise AT disable status (b2, b6, b10, b14
of Rwr3) to 1 (ON). With CH Auto tuning status (RX20 to RX23) on, the module performs the same
processing as normal auto tuning.
ON
OFF
ON
OFF
PID control
OFF
Controlled by the program
Controlled by the temperature control module
Auto tuning
PID control
ON
CHAPTER 8 FUNCTIONS
203
8
Advertisement
Table of Contents
Troubleshooting
