17
●
The following shows an example of how to set the event setting during detection of a
line break.
Calculate the event setting using the heater current value at control output ON (moni-
tor the displayed CT value) and heater current value at control output OFF (cannot be
measured on the product) according to the following equation:
Event setting = {(heater current value at control output ON) + (heater current value at
control output OFF)}/2
2
Direct/reverse setting (C14 and C15 2nd digit setting)
The direct/reverse setting is used to reverse (invert an ON/OFF relationship) the operation of the event set
on the 1st digit. (0: Direct, 1: Reverse)
Handling Precautions
●
Direct operation of the PV upper limit alarm and deviation upper limit alarm is the
same as the reverse limit of PV lower limit alarm and deviation lower limit alarm op-
eration.
Example: Event operation type setting (1st digit):
3 (PV upper and lower limits)
Direct/reverse operation setting (2nd digit): 1 (reverse)
●
When using the heater line break/overcurrent and control short-circuit alarm, set
the
area to 3A or more.
3
Additional function settings (C14 and C15 3rd digit setting)
Standby and latch operations can be added as additional functions to an event operation type set on the 1st
digit.
Settings
0: No
1: Standby
2: Latch
3: Standby and Latch
4: Non
5: Standby at changing SP
Note
●
Standby
The standby function prevents an event from turning ON, even when the ON condi-
tion of that event is satisfied at controller power ON or when the READY mode changes
to the RUN mode.
Event output is activated when an ON condition is satisfied after an OFF condition
has been satisfied. The standby state occurs at power ON when the PV value is the
shaded area.
●
Latch
Once event output is ON, the latch function holds an event in the ON state even when
an OFF condition is satisfied. Follow the procedure below to reset the latch state.
Chapter 5 INITIAL SETTINGS
●
When using the PV, deviation upper/lower limit and heater line break/overcurrent and
control device short-circuit alarm, set HYS so that the OFF point is not lost.
ExLo
ExHI
PV
ON
OFF
HyS
HyS
(bad example)
(correct setting)
HyS
HyS
ExLo
ExHI
PV
ON
OFF
ExHI
HyS
HyS
ExLo
ON
OFF
PV
