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In DTB series, P (Proportional Band), I(Integral Time) and D(Derivative
Time) parameters are automatically set by using the Auto-tuning (AT)
function.
: This parameter is for the control mode that must be Dual Loop
output control with PID control method configured. The value of P, I and D of
1st output group can be set immediately. The P value of 2nd output group is
equal to (P value of 1st output group) x
2nd output group are the same as the value of I and D of 1st output group.
: Dead Band, shown as the following figure 1, 2 and 3. This
parameter sets an area in which the heating and cooling control output is 0
centering around the set point in a Dual Loop output control mode.
: Settings lock. To avoid incorrect operation, two key lock functions
are provided.
: Lock 1 can lock all settings. All parameters and
temperature settings can be locked to disable changes.
can lock settings except the SV (Set point) value. All parameters and
temperature settings can be locked with the exception of the SV value.
Press
and
released.
8
There are up to three groups of alarm outputs and each group allows thirteen alarm types in the initial setting
mode. The alarm output is activated whenever the process temperature value (PV) is getting higher or lower than
the set point of alarm limit.
Set
Value
0
Alarm function disabled
1
Deviation upper- and lower-limit:
This alarm output operates when PV value is higher than the setting value
SV+(AL-H) or lower than the setting value SV-(AL-L).
2
Deviation upper-limit:
This alarm output operates when PV value is higher than the setting value
SV+(AL-H).
3
Deviation lower-limit:
This alarm output operates when PV value is lower than the setting value SV-(AL-L).
4
Reverse deviation upper- and lower-limit:
This alarm output operates when PV value is in the range of the setting value
SV+(AL-H) and the setting value SV-(AL-L).
5
Absolute value upper- and lower-limit:
This alarm output operates when PV value is higher than the setting value AL-H or
lower than the setting value AL-L.
6
Absolute value upper-limit:
This alarm output operates when PV value is higher than the setting value AL-H.
7
Absolute value lower-limit:
This alarm output operates when PV value is lower than the setting value AL-L.
8
Deviation upper- and lower-limit with standby sequence:
This alarm output operates when PV value reaches set point (SV value) and the
value is higher than the setting value SV+(AL-H) or lower than the setting value
SV-(AL-L).
key simultaneously, the "Lock" status can be
Alarm Type
and the value of I and D of
: Lock 2
Alarm Outputs
7
Dead band: dead
Output
band width=negative
Heating
Cooling
0
Set point
Figure 3. PID
control,
Dead Band is negative
Alarm Output Operation
Output is OFF
ON
OFF
SV-(AL-L)
ON
OFF
ON
OFF
SV-(AL-L)
ON
OFF
SV-(AL-L)
ON
OFF
AL-L
ON
OFF
ON
OFF
AL-L
ON
OFF
SV-(AL-L)
PV
SV
SV+(AL-H)
SV
SV+(AL-H)
SV
SV
SV+(AL-H)
AL-H
AL-H
SV+(AL-H)
SV
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