Autonics TM4 Series - LBA Detection Band Settings

6 Parameter Settings and Functions
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6.4.8.2 LBA Detection Band Settings
You can set the minimum value of deviation change to decrease during LBA monitoring
time. Automatically setting with auto-tunning.
Group Parameter Range
Factory
Default
Unit
Alarm Setting Group
LBA Band_Ch1,
LBA Band_Ch2
1~999
0.1~999.9
3 ℃,℉
It checks control loop and outputs alarm by temperature change of the subject.
For heating control(cooling control), when control output MV is 100%(0% for
cooling control) and PV is not increased over than LBA detection band [LBA.B]
during LBA monitoring time [LBA.T], or when control output MV is 0%(100% for
cooling control) and PV is not decreased below than LBA detection band
[LBA.B] during LBA monitoring time [LBA.T], alarm output turns ON.
Start
to ①
When control output MV is 100%, PV is increased over than LBA
detection band [LBA.B] during LBA monitoring time [LBA.T].
① to ②
The status of changing control output MV (LBA monitoring time is
reset.)
② to ③
When control output MV is 0% and PV is not decreased below
than LBA detection band [LBA.B] during LBA monitoring time
[LBA.T], loop break alarm (LBA) turns ON after LBA monitoring
time.
③ to ④
Control output MV is 0% and loop break alarm (LBA) turns and
maintains ON.
④ to ⑥
The status of changing control output MV (LBA monitoring time is
reset.)
⑥ to ⑦
When control output MV is 100% and PV is not increased over
than LBA detection band [LBA.B] during LBA monitoring time
[LBA.T], loop break alarm (LBA) turns ON after LBA monitoring
time.
⑦ to ⑧
When control output MV is 100% and PV is increased over than
LBA detection band [LBA.B] during LBA monitoring time [LBA.T],
loop break alarm (LBA) turns OFF after LBA monitoring time.
⑧ to ⑨
The status of changing control output MV (LBA monitoring time is
reset.)
When in standard control mode, a loop error will be assumed and the
alarm output is turned on if the control deviation |SV-PV| is beyond the
LBA Detection Set (
LBA.S
: LBA Set Level) and does not decrease below
the LBA detection band (
LBA.B
: LBA Band) within the LBA monitoring
time (
LBA.T
: LBA Time).
Control Start
①
After control starts, the LBA output turns off as control deviation |SV-
PV| is reduced below the LBA detection band within the LBA
detection time.
②
Control deviation |SV-PV| is within LBA Detection Set. LBA is not in
operation.
③
Control deviation |SV-PV| does not decrease below the LBA
detection band within the LBA monitoring time when PV is out of
LBA detection range. LBA output therefore turns on.
④
Control deviation |SV-PV| decreases below the LBA detection band
within the LBA monitoring time when PV is out of LBA detection
range. LBA output therefore turns off.
⑤
Control deviation |SV-PV| does not decrease below the LBA
detection band within the LBA monitoring time when PV is out of
LBA detection band. LBA output therefore turns on.