Loop Burnout Alarm; Loop Burnout Alarm (Lba) - Omron E5AN User Manual

Loop Burnout Alarm

Operation Level
PV/SP
C
25
100

4-12 Loop Burnout Alarm

4-12-1 Loop Burnout Alarm (LBA)

Set point
LBA detec-
tion time
(1)
118
9. Press the O Key for at least one second to move from the initial setting
level to the operation level.
• With a loop burnout alarm, there is assumed to be an error in the control
loop if the control deviation (SP
the LBA Level parameter and if the control deviation is not reduced by at
least the value set in the LBA Detection Band parameter within the LBA
detection time.
• Loop burnout alarms are detected at the following times.
Area where LBA LBA detection
is not detected time
(2) (3) (4)
LBA OFF
If the control deviation is reduced in the area between 1 and 2 (i.e., the set
point is approached) and the amount the control deviation is reduced is at
least equal to the LBA band, the loop burnout alarm will remain OFF.
The process value is within the LBA level between 3 and 4, and thus loop
burnout alarms will not be detected. (The loop burnout alarm will remain OFF.)
If the process value is outside the LBA level between 4 and 5 and the control
deviation is not reduced by at least the LBA band within the LBA detection
time, the loop burnout alarm will turn ON.
If the control deviation is reduced in the area between 5 and 6 (i.e., the set
point is approached) and the amount the control deviation is reduced is at
least equal to the LBA band, the loop burnout alarm will turn OFF.
If the control deviation is reduced in the area between 6 and 7 (i.e., the set
point is approached) and the amount the control deviation is reduced is less
than the LBA band, the loop burnout alarm will turn ON.
• If the LBA detection time, LBA level, LBA detection band, and PID set-
tings are not appropriate, alarms may be detected inappropriately or
alarms may not be output when necessary.
• Loop burnout alarms may be detected if unexpectedly large disturbances
occur continuously and a large deviation does not decrease.
• If a loop burnout occurs when the set point is near the ambient tempera-
ture, the temperature deviation in a steady state may be less than the LBA
level, preventing detection of the loop burnout.
PV) is greater than the threshold set in
LBA band
LBA band
LBA detection
LBA detection
time
time
(5) (6)
LBA ON LBA OFF
Section 4-12
LBA level
LBA level
LBA band
(7)
LBA ON