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Deviation alarm/Process alarm
SV display unit
PV display unit
Alarm mode selectable
Retransmission Output (Option)
Hold function of alarm selectable
Set Description
0 Deviation alarm
1 Process alarm
Set Description
0 Band alarm
1 High and Low alarm
Set Description
0 With retransmission output
1 None
Set Description
0 With hold function
1 Without hold function
Set Description
1 ℃
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Indicator / Controller
SV display unit
PV display unit
℃
Decimal point selectable
Output (Fixed)
Set Description
0 Indicator
1 Controller
Set Description
0 Decimal point
1 None
Set Description
0 Current output
1 Relay or voltage pulse output
※ ALH & ALL will be initialized if you change the deviation alarm or
process alarm at the SL3
※ For DCV input, if SL12 and SL13 are changed, the parameters related to temperature are initialized.
▒ Control loop break alarm (LBA) function
●Setting procedure
Usually set the set-value of the LBA to a value of twice the integral time (I).
The LBA can also be set by the auto-tuning (AT) function. In this case,
the set-value is automatically set to a value of twice the integral time (I).
●Description of operation
LBA function starts to measure the time from the moment when the
control output becomes 0% or 100%, and it detects the variation of the
process value in LBA setting time and then it determines that LBA is
ON or OFF by the variation.
• The LBA is ON if the process value is not increasing more than 2 ℃
within the LBA set-vale when the control output is 100%.
(In direct operation, the LBA is ON if the process value is not
decreasing more than 2 ℃.)
• The LBA is ON if the process value is not decreasing more than 2 ℃
within the LBA set-vale when the control output is 0%.
(In direct operation, the LBA is ON if the process value is not
increasing more than 2 ℃.)
●Causes of action
The LBA is activated under the following conditions.
•Controlled object trouble : Heater break, no power supply, incorrect
wiring, etc.
•Sensor trouble : Sensor disconnected, shorted, etc.
•Actuator trouble : Burnt relay contact, incorrect wiring, relay contact
not closed, etc.
•Output circuit trouble : Burnt internal relay contact, relay contact not
open or closed, etc.
•Input circuit trouble :
The process-value does not change even if input
changes, etc.
※ If causes of the above trouble cannot be identified, check the control
system.
●Cautions for control loop break alarm (LBA) function
•The LBA function is activated only when the control output is 0 % or
100 %. Therefore, the time from trouble occurrenece till the activation
of the LBA function equals the time of when the control output
becomes 0 % or 100 % plus the LBA setting time.
• No LBA function is activated while the auto-tuning (AT) function is
activated.
• The LBA function is influenced by disturbances (heat sources, etc)
and as a result may be activated even if there is no trouble in the
control system.
•If LBA setting time is too short or does not match the controlled
object, the LBA may be turned ON/OFF or not be turned ON. In such
case, set the setting time of LBA to be slightly longer.
PV display
unit
Description
SV display unit
(Setting range)
Remark
Decimal point
position
selection
0 ~ 4
If you want 000.0, set
0002 on SV display unit.
Input
correction
-100 ~ 100 % of FS
Hysteresis of
high alarm
(ALH)
0 ~ 10 % of FS
Max. value of
temperature
setting range
Within input
range
Refer to input type
table
Min. value of
temperature
setting range
Within input
range
Refer to input type
table
Control
operation
direction
0, 1
0 : Reverse operation
1 : Direct operation
Hysteresis of
low alarm (ALL)
0 ~ 10 % of FS
Input lter
0 ~ 100 second
Max. input
scale setting
9999 Only for voltage input
Min. input
scale setting
-1999 Only for voltage input
Delay time of
high alarm
(ALH)
0 ~ 100 second
Delay time of
low alarm
(ALL)
0 ~ 100 second
Main functions
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