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Before staring Installation Operation Specifications
Event type Event motion
PV high limit event
with stand by run
PV high limit event
without stand by run
ONOFFOFF
Stand by
Event
EV
PV
Start run
ONOFFOFF ONEvent
EV
PV
● Loop break event
With loop break alarm function, state such as heater break and incorrect wiring, break and short circuit
of temperature sensor, and output circuit irregularity can be detected. Loop break event time (LBT) is set
automatically when running auto tuning by setting “15” at event type (EVTY), and with loop break alarm time (LBT)
set to double of total integral time (TI). If conditions are as below during loop break alarm time (LBT), loop break
alarm (LBA) occurs.
* Loop break alarm occurs only if manipulated Value (MV) is 100% or 0%.
※ If process value (PV) is within the range of proportional band (PB), and if loop break dead band
(LBD) parameter is set and process value (PV) is within the range of dead band, event does not
occur even with loop break alarm (LBA) occurring condition, and occurs only if out of proportional
band (PB).
•LBD › PB
Event area PB Event area
LBD LBDSV
•LBD ≦ PB
Event area PB Event area
LBD LBDSV
Control
run (DR)
Manipulated Value
(MV)
Loop break alarm (LBA) occurrence condition
Reverse run
(heating control)
100 % No ascending of over 2oC (if direct current voltage DCV, 2%)
0 % No descending of over 2oC (if direct current voltage DCV, 2%)
Forward run
(cooling control)
100 % No descending of over 2oC (if direct current voltage DCV, 2%)
0 % No ascending of over 2oC (if direct current voltage DCV, 2%)
Start run
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