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(b) Condition for the simultaneous temperature rise parameter setting using self-tuning
The condition is the same as that for the starting ST. ( Page 227, Section 4.18 (4) (a))
When the self-tuning cannot be started up, the Q64TCN operates as following with the PID control continued:
•CH Self-tuning disable status (b8 of Un\G575, Un\G607, Un\G639, Un\G671) is turned 1 (ON).
The following shows how the Q64TCN operates when self-tuning is not executed.
(c) When the simultaneous temperature rise parameter cannot be calculated
The simultaneous temperature rise parameter cannot be calculated under the following conditions:
• When the maximum gradient is not determined
• When the saturation time for output is short
The Q64TCN turns CH Simultaneous temperature rise parameter error status (b9 of Un\G575, Un\G607,
Un\G639, Un\G671) to 1 (ON).
To restore CH Simultaneous temperature rise parameter error status (b9 of Un\G575, Un\G607, Un\G639, Un\G671) to 0
(OFF), set the following:
•Set CH Self-tuning setting (Un\G574, Un\G606, Un\G638, Un\G670) to Do not run the ST (0).
To calculate the simultaneous temperature rise parameter, execute self-tuning again after the temperature has dropped.
CH Auto tuning status
(Xn4 to Xn7)
Control status
CH Self-tuning disable status
(b8 of Un\G575, Un\G607, Un\G639, Un\G671)
OFF
PID control
OFF
ON
Temperature control start, set value (SV) change or
oscillation detected
CH Auto tuning status
(Xn4 to Xn7)
Control status
CH Simultaneous temperature rise gradient data
(Un\G731, Un\G747, Un\G763, Un\G779) and
CH Simultaneous temperature rise dead time
(Un\G732, Un\G748, Un\G764, Un\G780)
CH Simultaneous temperature rise parameter
error status
(b9 of Un\G575, Un\G607, Un\G639, Un\G671)
OFF
PID control Self-tuning PID control
OFF
ON
ON
0
Executed by the Q64TCN
Temperature control start, set value (SV) change or
oscillation detected