Omron EJ1 User Manual

97
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. With
analog inputs, the decimal point position is determined by the Decimal
Point Position parameter setting. In this case, however, the 0 (****) deci-
mal 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) 1 to 9999 EU
(See note 2.)
80
LBA Band (Channel) 0 to 9999 EU
(See note 2.)
30
Conditions for use The alarm type must be set to 12.

Omron EJ1 Specifications

General

Brand	Omron
Model	EJ1
Category	Temperature Controller
Language	English