Azbil C1M - PID Control

5-21
Chapter 5. Functions

PID control
The settings related to PID control can be specified.
Item (bank) Display Description Initial value User level
Proportional band
(PID bank)
P-1
0.1 to 999.9 % 5.0 % Simple,
standard,
advanced
Integration time
(PID bank)
I-1
0 to 9999 U
(0 = no integral operation)
120 s
Derivative time
(PID bank)
D-1
0 to 9999 U
(0 = no derivative operation)
30 s
Manual reset
(PID bank)
RE-1
−10.0 to +110.0 % 50.0 %
MV low limit
(PID bank)
OL-1
−10.0 to +110.0 % 0.0 % Standard,
advanced
MV high limit
(PID bank)
OH-1
−10.0 to +110.0 % 100.0 %
Cool-side proportional band
(PID bank)
P-1C
0.1 to 999.9 % 5.0 % Simple,
standard,
advanced
Cool-side integration time
(PID bank)
I-1C
0 to 9999 U
(0 = no integral operation)
120 s
Cool-side derivative time
(PID bank)
D-1C
0 to 9999 U
(0 = no derivative operation)
30 s
Cool-side MV low limit
(PID bank)
OL1C
−10.0 to +110.0 % 0.0 % Standard,
advanced
Cool-side MV high limit
(PID bank)
OH1C
−10.0 to +110.0 % 100.0 %
• If CtrL (control method) is set to “1” (PID control), this item is displayed and the
setting can be changed.
• The abbreviations for “Cool-side proportional band,” “Cool-side integration
time,” and “Cool-side derivative time” are displayed and the settings can be
changed if C26 (heat/cool control ) is set to 1 (use (individual PID)).
• The abbreviations for “Cool-side MV low limit” and “Cool-side MV high limit”
are displayed and the settings can be changed if C26 (heat/cool control ) is set to 1
or 2 (use).
• In heating/cooling control, if “integration time” (I-1) or “cool-side integration
time” (I-1C) is 0 seconds, no integration is performed. Manual reset (rE-1) is
used for both heating and cooling.
• rE-1 (manual reset) is displayed if the integration time setting for either heating
or cooling is “0.”
• If the integration time for either heating or cooling is 0 seconds, both integration
times are processed as 0 seconds.
• If the MV low limit is greater than the MV high limit, the low limit and the high
limit are automatically interchanged.