Omron E5AN-H User Manual page 136

Loop Burnout Alarm
Parameters Related to Loop Burnout Alarms
Parameter name Symbol
∗.lba
PID* LBA Detection
Time
(*: 1 to 8)
lba
LBA Detection Time
lbal
LBA Level
lbab
LBA Band
Note
Automatically Setting
the LBA Detection
Time
• 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.
• If the set point is so high or low that it cannot be reached even with a sat-
urated manipulated variable, a temperature deviation may remain even in
a steady state and a loop burnout may be detected.
• Detection is not possible if a fault occurs that causes an increase in tem-
perature while control is being applied to increase the temperature (e.g.,
an SSR short-circuit fault).
• Detection is not possible if a fault occurs that causes a decrease in tem-
perature while control is being applied to decrease the temperature (e.g.,
a heater burnout fault).
Setting range
0 to 9999 (s)
Controllers with tempera-
ture inputs
Controllers with analog
inputs
Controllers with tempera-
ture inputs
Controllers with analog
inputs
Set "None" as the unit for analog inputs.
• A loop burnout alarm can be output by setting the alarm 1 type to 12
(LBA).
• A setting of 12 (LBA) can be set for alarm 2 or alarm 3, but the setting will
be disabled.
• Loop burnouts are not detected during SP ramp operation.
• Loop burnouts are not detected during auto-tuning, manual operation, or
while stopped.
• If the alarm 1 latch is set to ON, the latch will be effective for the loop
burnout alarm.
• Loop burnout alarms are not detected when using a remote SP.
• Automatic setting is not possible for ON/OFF control. Set the LBA Detec-
tion Time parameter in the advanced function setting level.
• When PID control is being used, the LBA detection time can be set indi-
vidually for each PID set. First select the PID set number in the Display
PID Selection parameter (PID setting level), and then set the time in the
LBA Detection Time parameter.
• The LBA detection time is automatically set by auto-tuning, and the exe-
cution results are saved in the PID set when auto-tuning is started. (The
results are not set automatically, however, for heating/cooling control.)
• If the optimum LBA detection time is not obtained by auto-tuning, set the
LBA Detection Time parameter (PID setting level).
0.1 to 3,240.0 (°C/°F) (See
note.)
0.01 to 99.99 (%FS)
0.0 to 3,240.0 (°C/°F) (See
note.)
0.00 to 99.99 (%FS)
Section 4-12
Remarks
Setting 0 disables the LBA
function.
Default: 8.0 (°C/°F)
Default: 10.00% FS
Default: 3.0 (°C/°F)
Default: 0.20% FS
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