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7-11
Chapter 7. PARAMETER SETUP
• The
AT
LED lights while the
br
value is reviewed when
St
is set to 2.
• Do not set to 2 when normal control is not being carried out due to inappropriate
tuning of the PID constant, for example.
Also, hunting is more likely to occur when
br
is set to a large value on quick-
starting lines. Set the
br
value to 0 then to 2.
• The channel that is connected to heat/cool output, smart-tuning does not
function.
●
2PId (2 degrees of freedom) (CH1)
0: 2 degrees of freedom is disabled.
1: 2 degrees of freedom is enabled.
• 2 degrees of freedom is a function for improving the response to disturbance
during setup without losing conventional characteristics at rise (or fall).
When set to 1, optimum PID constants can be set individually for inhibiting
disturbance in addition to conventional PID constants.
These constants are set automatically during AT execution, and are memorized.
They can also be set and changed independently.
In particular, on 2G output models, suppressing changes in MV to lessen the
frequency of motor operation during setup, and manually applying weak PID
differential for inhibiting disturbance to lengthen service life, for example, prove
effective.
• These PID are switched automatically by applying fuzzy rules on the slope
between deviation and PV.
• When
I
(reset time) is set to 0, control is carried out without integration in all
states regardless of the setting value of
dI
(disturbance inhibit reset time).
• On the channel which is connected to heat/cool output, 2 degrees of freedom
does not function.
●
dIFF
• Position-proportional control dead zone
On 2G output models, a dead zone between the motor open and motor closed
positions is set.
As a general guideline, the minimum value is the value where this dead zone
changes to stop motor hunting once a fixed value set to manual output is being
output.
If this value is set without any margin, the motor will be operating at all times,
which will considerably shorten its service life.
The factory setting is 5%. Use this as a guideline, and take the control results and
motor service life into consideration when setting the dead zone.
Closed-side relay ON
Control output (%)
Open-side relay ON
*
*
MFB (%)
*
: 1/4 of dead zone
Dead zone