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(8) CH Auto tuning instruction (RY20 to RY23)
Use this signal to start auto tuning for each channel. Turning on the signal starts auto tuning and CH Auto
tuning status (RX20 to RX23) turns on. After auto tuning is completed, CH Auto tuning status (RX20 to RX23)
turns off.
Keep the signal on during auto tuning and turn it off at the completion of the auto tuning. If the signal is turned off
during auto tuning, the auto tuning is stopped. If the auto tuning is stopped, PID constants in the remote buffer
memory area do not change.
● If proportional band (P)/heating proportional band (Ph) is set to 0, auto tuning cannot be executed. (Page 318,
Appendix 3 (7))
● If CH Stop request flag (RY18 to RY1B) is turned on during auto tuning and CH Operation monitor (RX11 to RX14)
turns off (stop status), the auto tuning is stopped. After that, if CH Operation request flag (RY11 to RY14) is turned on
and CH Operation monitor (RX11 to RX14) turns on (operating status), the auto tuning is not resumed. To resume the
auto tuning, turn off CH Auto tuning instruction (RY20 to RY23), and turn it on again.
For details on the auto tuning function, refer to the following.
Page 159, Section 8.3.7
(a) Auto tuning during stop status
The auto tuning instruction is also accepted during stop status. The following are the operations.
1: Turn on CH Auto tuning instruction (RY20 to RY23).
2: CH Operation monitor (RX11 to RX14) turns on (operating status).
3: Auto tuning is started.
4: Check that the auto tuning is completed (CH Auto tuning status (RX20 to RX23) is off), and turn off CH
Auto tuning instruction (RY20 to RY23).
5: CH Operation monitor (RX11 to RX14) remains on after the operation 4 is executed.
CH Operation monitor (RX11 to RX14) also remains on if CH Auto tuning instruction (RY20 to RY23) is
turned off during auto tuning.
CH□ Operation monitor
(RX11 to RX14)
OFF
CH□ Auto tuning instruction
(RY20 to RY23)
OFF
CH□ Auto tuning status
(RX20 to RX23)
OFF
Controlled by the program
Controlled by the temperature control module
ON
ON
ON
Standard
Heating-cooling
OFF
OFF
APPENDICES
A
299
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Troubleshooting
