Azbil C1M - Ra-PID

5-26
Chapter 5. Functions
Handling Precautions
• If C26 (heat/cool control) is set to 2 (use (shared PID), execute AT with
settings that satisfy:
50.0 % < MV low limit at AT (At.OL) < MV high limit at AT (At.OH)
• If you change a setting such as PV input range type or linear scaling
low/high limit while AT is running, AT may not end. Do not change any
settings other than At (AT stop/start selection) while AT is running.
• If you want to execute AT only for heating PID constants when C26 (heat/
cool control) is set to 1 (use (individual PID), the settings should satisfy:
50.0 % < MV low limit at AT (At.OL) < MV high limit at AT (At.OH)
• If you want to execute AT only for cooling PID constants when C26 (heat/
cool control) is set to 1 (use (individual PID), the settings should satisfy:
MV low limit at AT (At.OL) < MV high limit at AT (At.OH) < 50.0 %

Ra-PID
Ra-PID (RationaLOOP control function) reduces instability when the response to
disturbance is improved by the high-precision control logic. The following settings
are available.
Item (bank) Display Description Initial value User level
Control algorithm
(extended tuning bank)
CTR.A
0: PID (conventional PID)
1: Ra-PID (high-performance PID)
0 Standard,
advanced
• If CtrL (control method) is set to “1” (PID control), this item is displayed and the
setting can be changed.