Azbil C1M - Control Method; Control Action and Heating;Cooling Control

5-16
Chapter 5. Functions
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Control method
There are two control methods.
Item (bank) Display Description Initial value User level
Control method
(parameter bank)
CTRL
0: ON/OFF control
1: PID control
0 or 1 Simple,
standard,
advanced
• If relay (R0) is selected for control output by the model No., the initial value is 0.
For other models, the initial value is 1.
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Control action and heating/cooling control
Direct/reverse of the control action and whether to use the heating/cooling control
can be selected.
Item (bank) Display Description Initial value User level
Control action (direct/reverse)
(setup bank)
C 14
0: Heating control (reverse action)
1: Cooling control (direct action)
0 Simple,
standard,
advanced
Heat/cool control
(setup bank)
C 26
0: Not used
1: Use (individual PID)
2: Use (shared PID)
0 Simple,
standard,
advanced
• If CtrL (control method) is set to 1 (PID control), C26 (heat/cool control) is
displayed and the setting can be changed.
• If C26 (heat/cool control) is set to 0 (not used), C14 (control action) is displayed
and the setting can be changed.
• If C26 (heat/cool control) is set to 0 (not used), C20 (preset MANUAL value) and
C22 (initial output of PID control) will change to 0.0.
• If the setting of C26 (heat/cool control) is changed from 0 (not used) to another
setting, C20 (preset MANUAL value) will change to 50.0 and C22 (initial output
of PID control) will change to 50.0.
• If C26 (heat/cool control) is set to 2 (use (shared PID)), At.OL (MV low limit at
AT) will change to 50.0 and At.OH (MV high limit at AT) will be 100.0.
• If C26 (heat/cool control) is changed from 2 (use (shared PID)) to another setting,
At.OL (MV low limit at AT) will change to 0.0 and At.OH (MV high limit at AT)
will be 100.0.
• Reverse action (heating control) is a control that reduces (or turns off) the MV
when the PV increases.
Direct action (cooling control) is a control that increases (or turns on) the MV
when the PV increases.