Omron E5CN User Manual page 130

Loop Burnout Alarm
Parameters Related to Loop Burnout Alarms
Parameter name Symbol
lba
LBA Detection Time
lbal
LBA Level
lbab
LBA Band
Note
Automatically Setting
the LBA Detection
Time
• 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 Thermo-
couple/Resistance Ther-
mometer Universal Inputs
Controllers with Analog
Inputs
Controllers with Thermo-
couple/Resistance Ther-
mometer Universal 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.
• The LBA detection time is automatically set by auto-tuning.
(It is 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 (advanced function setting level).
0.1 to 999.9 (°C/°F) (See
note.)
0.01 to 99.99 (%FS)
0.0 to 999.9 (°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
105