39
CHAPTER 3 SPECIFICATIONS
3
3.
3 F
unct
ion List
Manual reset function
The position of the stable condition in P control or PD control can be shifted
manually using this function.
Manual control
Manual control is a form of control for which the user sets the manipulated
value (MV) manually instead of obtaining it automatically by PID control.
Control output cycle
unit selection function
The unit of the control output cycle can be selected from 1s or 0.1s using this
function. When the control output cycle is set in 0.1s, control can be more
attentive.
Auto tuning function
The auto tuning function is designed for the temperature control module to set
the optimum PID constants automatically.
Simple two-degree-of-
freedom
This is the simplified control form of the two-degree-of-freedom PID control. In
this form of PID control, the temperature control module controls the target
subject using not only PID constants but also the control response parameter.
The response speed toward the change of the set value (SV) can be selected
from three levels.
Derivative action
selection function
A derivative action appropriate for each of fixed value action and ramp action
can be selected and the action characteristic can be improved using this
function.
Setting change rate
limiter setting function
When the set value (SV) is changed, the change rate in the specified time unit
can be set on "Setting Change Rate Limiter Setting". The user can select
whether to set this rate for temperature rise and temperature drop individually
or at once.
Alert function
When the temperature process value (PV) or deviation (E) reaches the value
set in advance, the system is set in an alert status.
RFB limiter function
The RFB (reset feed back) function operates when deviation (E) continues for
a long period of time. In such an occasion, this function limits the PID
operation result (manipulated value (MV)) from an integral action so that it
does not exceed the valid range of the manipulated value (MV).
Input/output (with
another analog
module) function
Input and output can be processed using other analog modules (such as an
A/D converter module or D/A converter module) in the system.
ON delay output
function
This function allows the user to set the delay (response/scan time
delay/communication delay) of transistor output.
Self-tuning function
The temperature control module constantly monitors the control state. When
the control system is oscillatory, this function allows PID constants to be
automatically changed under the following situations such as: After the control
has been just started, When the set value (SV) is changed, and When the
characteristics of a controlled object fluctuates.
Peak current
suppression function
The upper limit output limiter value for each channel is changed automatically
and the peak current is suppressed by dividing timing for transistor outputs
using this function.
Simultaneous
temperature rise
function
This function allows several loops to reach the set value (SV) at the same
time.
Forward/reverse action
selection function
Whether PID operation is performed with forward action or reverse action can
be selected using this function.
Loop disconnection
detection function
Using this function detects an error occurring within a control system (control
loop) due to reasons such as a load (heater) disconnection, an externally-
operable device (such as a magnetic relay) failure, and input disconnection.
AT loop disconnection
detection function
A loop disconnection can be detected during auto tuning (AT) using this
function.
Proportional band
setting function
Proportional band (P) values can be set for heating and cooling separately
using this function.
Cooling method setting
function
An auto tuning calculation formula is automatically selected according to the
selected cooling method during auto tuning and the operation is started using
this function.
Overlap/dead band
function
The temperature where the cooling control output starts can be shifted using
this function; therefore, whether control stability is prioritized or energy saving
is prioritized can be selected.
Item
Description
Enable or disable
Reference
Standard
control
Heating-
cooling
control
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