Omron E5*D series User Manual page 200

5 Advanced Operations
• Detection is not possible if a fault occurs that causes a decrease in temperature while control is
being applied to decrease the temperature (e.g., a heater burnout fault).
 Parameters Related to Loop Burnout Alarms
Parameter
name
LBA Detection
Time
LBA Level
LBA Band
• 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 alarms 2 to 4, 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.
 Automatically Setting the LBA Detection Time
• 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).
 Determining the LBA Detection Time
• To manually set the LBA detection time, set the LBA Detection Time parameter to twice the LBA
reference time given below.
(1) Set the output to the maximum value.
(2) Measure the time required for the width of change in the input to reach the LBA
band.
Temperature
(3) Set the LBA Detection Time parameter to two times the measured time.
 LBA Level
• Set the control deviation when the control loop is working properly.
• The default is 8.0 (°C/°F) for Digital Controllers with Temperature Inputs and 10.00% FS for Digital
Controllers with Analog Inputs.
5 - 54
Display Setting range
0 to 9999 (s)
lba
Temperature input
lbal
Analog input
Temperature input
lbab
Analog input
Measurement time
Tm
LBA detection time = Tm × 2
Remarks
Setting 0
disables the LBA
function.
0.1 to 999.9 (°C/°F) Default: 8.0
(°C/°F)
0.01 to 99.99 Default: 10.00%
(%FS) FS
0.0 to 999.9 (°C/°F) Default: 3.0
(°C/°F)
0.00 to 99.99 Default: 0.20%
(%FS) FS
PV
LBA band
MV = 100%
Time
E5@D Digital Temperature Controllers User's Manual (H224)
Level
Advanced
Function Setting
Level