Azbil C35 Series User Manual

5-26
Chapter 5. DETAILED DESCRIPTION OF EACH FUNCTION

Auto tuning (AT)
The following AT related items can be set:
Item (Bank) Display Contents Initial value User level
MV low limit at AT
(Parameter bank)
-10.0 to +110.0% 0.0% Basic,
Standard,
High function
MV high limit at AT
(Parameter bank)
-10.0 to +110.0% 100.0%
AT type
(Extended tuning bank)
0: Normal (Standard control characteristics)
1: Immediate response (Control
characteristics that respond immediately
to external disturbance.)
2: Stability (Control characteristics having
less up/down fluctuation of PV)
0
AT Proportional band adjust
(Extended tuning bank)
0.00 to 99.99 1.00 High function
AT Integral time adjust
(Extended tuning bank)
0.00 to 99.99 1.00
AT Derivative time adjust
(Extended tuning bank)
0.00 to 99.99 Position proportional
control model: 0.00 *,
Nonposition propor.
types: 1.00
* AT derivative time adjustment coefficient
Since the coefficient on position proportional control models (with code R1 in the control output segment of the model
No.) is originally set at 0.00, the derivative time is 0 seconds when AT is complete. To have the AT result affect control,
change the setting to 1.00.
• When the control method is other than the ON/OFF control (
CtrL
≠ 0), the
display and setting can be configured.
• The manipulated variable (MV) during execution of AT can be limited by the
MV low limit at AT (
At.OL
) and MV high limit at AT (
AT.OH
).
When the Heat/Cool control is not used, the MV becomes a value limited by both
the MV low limit at AT (
At.OL
)/MV high limit at AT (
At.OH
) and MV low
limit (
OL-
_)/MV high limit (
OH-
_) of the PID constant.
When the Heat/Cool control is used, the MV becomes a value limited by the MV
low limit at AT (
At.OL
)/MV high limit at AT (
At.OH
), the heat MV becomes
a value limited by the MV low limit (
OL-
_)/MV high limit (
OH-
_) of the PID
constant, and the cool MV becomes a value limited by the cool-side MV low limit
(
OL.
_
C
)/cool-side MV high limit (
OH.
_
C
) of the PID constant.
• The AT type (
At.ty
) is a setting item that the PID constant of the control
characteristics suitable for the system is calculated by the AT.
Set value 1 (immediate response) is adjusted to the process that the heater heating
directly affects the PV to aim at the adjustment considering the immediate response.
Set value 2 (stability) is adjusted to the process that the heater heating indirectly
affects the PV to aim at the adjustment considering the stability.
• If the setting is made so that the MV low limit at AT is greater than MV high
limit at AT, the operation is performed with the low limit swapped for the high
limit automatically.
Note
When compared to the AT functions of Azbil Corporation's older models, set
value 1 (immediate response) is close to the SDC10 and set value 0 (normal) is
close to the SDC20/21 and SDC30/31.

Azbil C35 Series Specifications

General

Brand	Azbil
Model	C35 Series
Category	Controller
Language	English