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5 Advanced Operations
E5@C Digital Temperature Controllers User’s Manual (H174)
5-11 L
o
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Bu
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5
5-11-1 Lo
op Bur
n
out Alar
m (LBA
)
• 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).
z
Parameters Related to Loop Burnout Alarms
• 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.
• Loop burnouts are not detected during remote SP operation.
z
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).
z
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.
(3) Set the LBA Detection Time parameter to two times the measured time.
z
LBA Level
• Set the control deviation when the control loop is working properly.
Parameter
name
Display
Setting range
Remarks
Level
LBA Detection
Time
lba
0 to 9999 (s)
Setting 0
disables the LBA
function.
Advanced
Function Setting
Level
LBA Level
lbal
Temperature input
0.1 to 999.9 (
°
C/
°
F) Default: 8.0
(
°
C/
°
F)
Analog input
0.01 to 99.99
(%FS)
Default: 10.00%
FS
LBA Band
lbab
Temperature input
0.0 to 999.9 (
°
C/
°
F) Default: 3.0
(
°
C/
°
F)
Analog input
0.00 to 99.99
(%FS)
Default: 0.20%
FS
PV
MV = 100%
Temperature
Time
Measurement time
Tm
LBA band
LBA detection time = Tm
×
2
Summary of Contents for E5C series
Page 2: ......
Page 18: ...Conventions Used in This Manual 16 E5 C Digital Temperature Controllers User s Manual H174 ...
Page 34: ...1 Introduction 1 10 E5 C Digital Temperature Controllers User s Manual H174 ...
Page 310: ...6 Parameters 6 94 E5 C Digital Temperature Controllers User s Manual H174 ...
Page 326: ...7 User Calibration 7 16 E5 C Digital Temperature Controllers User s Manual H174 ...
Page 364: ...A Appendices A 38 E5 C Digital Temperature Controllers User s Manual H174 ...
Page 365: ...Index 1 E5 C Digital Temperature Controllers User s Manual H174 I Index ...
Page 370: ...Index 6 E5 C Digital Temperature Controllers User s Manual H174 ...