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102
Using the Loop Break Alarm (LBA)
Section 4-6
4-6
Using the Loop Break Alarm (LBA)
4-6-1
Loop Burnout Alarm (LBA)
With a loop burnout alarm, there is assumed to be an error in the control loop
if the control deviation (SP-PV) is greater than the threshold set in the LBA
Level parameter and if the control deviation is not reduced by at least the
value set in the LBA Band parameter within the specified LBA Detection Time.
• If the control deviation is reduced in the area between (1) and (2) (i.e., the
set point is approached) and the control deviation is reduced by at least
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 value 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 control deviation is reduced by at least
the LBA Band value, 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 control deviation is reduced by less than
the LBA Band value, the loop burnout alarm will turn ON.
Note
(1) This parameter can be set only when operation is stopped.
(2) The decimal point position is determined by the sensor selection. In this
case, however, the 0 (****) decimal point position setting will be treated as
a setting of 1 (***.*).
Refer to
4-7-1 Bank Function
for details on banks.
Set point
Time
LBA Band
LBA Band
LBA Band
LBA
Detection
Time
LBA
Detection
Time
LBA
Detection
Time
LBA
Detection
Time
Area where
LBA is not
detected
LBA Level
LBA Level
LBA OFF
LBA ON
LBA OFF
LBA ON
(2) (3)
(1)
(4)
(5)
(6)
(7)
Variable type
Parameter name
Setting range
Default
E3/A3
LBA Detection Time
(Channel) 0 to 9999 Seconds 0
LBA Level
(Channel) 0.1 to 999.9 EU
(See note 2.)
8.0
LBA Band
(Channel) 0.0 to 999.9 EU
(See note 2.)
3.0
Conditions for use
The alarm type must be set to 12.
Summary of Contents for EJ1 EtherCAT
Page 2: ...EJ1 Modular Temperature Controllers User s Manual Revised July 2008 ...
Page 3: ...iv ...
Page 19: ...xx ...
Page 213: ...188 Detailed Description of Services Section 6 4 ...
Page 227: ...202 Detailed Description of Services Section 7 5 ...
Page 303: ...278 Index ...
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