Chino KP 2000 Series, Instructions Manual

Page: 88 / 144

- 85 -
10-4. Auto tuning
Auto tuning (AT) is a function that automatically calculates PID constant.
There are four types of auto tunings namely AT1 to AT4 as shown below.
①
AT1
・
It is an auto tuning for output 1.
・
It can be executed in RUN status (excluding program end status) or in constant value control status.
・
Execute auto tuning by using SV when AT1 is set.
・
PID calculated by using AT1, is registered in PID of PID number that is executing.
(excluding RESET
→
constant value control status)
・
AT1 at RESET
→
constant value control status is registered in executing PID (mode 0) only.
②
AT2
・
It is an auto tuning for output 1.
・
It can be executed in RESET status (excluding constant value control status).
・
8 types of SV for AT2 can be set beforehand and 8 types of PIDs can be calculated according to those.
・ PID calculated using AT2, is registered respectively in PID numbers from 1 to 8. ON/OFF of AT can be set
for each of the 8 types separately and AT execution of only arbitrary numbers is also possible.
③ AT3
・ It is an auto tuning for output 1.
・ It can be executed in RESET status (excluding constant value control status).
・
8 types of SV for AT3 can be set beforehand and 8 types of PIDs can be calculated according to those.
・
PID calculated using AT3, is registered respectively in PID numbers from 9-1 to 9-8. ON/OFF of AT can
be set for each of the 8 types separately and AT execution of only arbitrary numbers is possible. ON/OFF
of AT can be set for each of the 8 types separately and AT execution of only arbitrary numbers is also
possible.
④
AT4
・
It is an auto tuning for output 2.
・
It can be executed in RUN status (excluding program end status) or in constant value control status.
・
Execute auto tuning by using SV when AT4 is set.
・
PID calculated by using AT4, is registered in output 2 PID
In case of output 2 specifications, MV (output value) on output 2 side during non executable AT is
continued control.
Sometimes even on starting the auto tuning operation normally, PID is not requested. Conditions when it
is not requested are as follows. In that case PID constants are not changed and the original PID constants
remain.
・ When response is delayed too much, when it does not end even after around six hours of auto tuning
operation.
・ When the value of P calculated by auto tuning is less than 0.1% or more than 1000%.
・
When the value of I calculated by auto tuning is less than 1 second.
・
When the value of D calculated by auto tuning is less than 1 second.