15
Sensor correction function
This corrects the input value from the sensor. When a sensor cannot be set at the exact location where control
is desired, the sensor measured temperature may deviate from the temperature in the controlled location.
When controlling with plural controllers, sometimes the measured temperatures do not concur due to
differences in sensor accuracy or dispersion of load capacities. In such a case, the control can be set at
the desired temperature by adjusting the input value of sensors.
However, it is effective within the input rated range regardless of the sensor correction value.
PV after sensor correction= Current PV+ (Sensor correction value)
Loop break alarm
The alarm will be activated when the process variable (PV) does not
rise
as much as the span or more
within the time it takes to assess the loop break alarm after the manipulated variable has reached 100%
or the output high limit value.
The alarm will also be activated when the process variable (PV) does not
fall
as much as the span or
more within the time it takes to assess the loop break alarm after the manipulated variable has reached
0% or the output low limit value.
When the control action is Direct (Cooling), read “
fall
” for “
rise
” and vice versa.
Energized/De-energized
When the alarm action Energized is selected, event output (between terminals 11 and 12) is conducted
(ON) while the event output indicator is lit. Event output is not conducted (OFF) while the event output
indicator is not lit.
When the alarm action De-energized is selected, event output (between terminals 11 and 12) is not
conducted (OFF) while the event output indicator is lit. Event output is conducted (ON) while the event
output indicator is not lit.
High limit alarm (when Energized is set)
High limit alarm (when De-energized is set)
(Fig. 5.5-1)
(Fig. 5.5-2)
Set value memory
If the SM option is added, the Set value memory number can be selected by external operation.
(However, only No. 2 is selectable.)
• To select the Set value memory number 2, connect terminals 8 and 9.
• Memory number cannot be changed during setting mode and auto-tuning.
5.6 Control output OFF function
Character
Name, Description
Control output OFF function
• A function to pause the control action or turn the control output of the unused
instrument of the plural units OFF even if the power to the instrument is supplied.
[
] is indicated on the PV/SV display while the function is working.
• This function can be selected from any mode or any setting item by pressing the
key for approx. 1 second.
• Once the control output OFF function is enabled, the function cannot be released
even if the power to the instrument is turned OFF and ON again.
To cancel the function, press the
key again for approx. 1 second.
OFF
ON
Hysteresis
SV
Alarm value
OFF
ON
SV
Alarm value
Hysteresis
