5. COMMUNICATION IDENTIRIERS
IMSRM04-E8
69
(2) Detected errors
LBA output is turned on if any of the following errors are detected.
Error activating LBA function
c
Controlled object trouble .. Heater break, no power supply, incorrect wiring, etc.
d
Sensor trouble ................... Sensor disconnected, shorted, etc.
e
Actuator trouble ................ Weld relay contact, incorrect wiring, relay contact not closed, etc.
f
Output circuit trouble........ Weld internal relay contact, relay contact not open or closed, etc.
g
Input circuit trouble........... The measured value does not change even if input changes, etc.
However, the cause of the above trouble cannot be identified, so check the control system
step by step.
(3) LBA deadband (LBD)
The LBA may enter the alarm condition due to a disturbance (Other heat sources, etc.) even if there is
no error in the control system. In this case, an area in which no alarm occurs can be set by setting
the LBA deadband (LBD). Set the LBD carefully because no alarm occurs even if alarm conditions
occur while the measured value (PV) is within the LBD area.
Area in which alarm
condition kept
Low
High
Area in which alarm
condition is kept
LBD differential gap (0.8
°
C)
LBD set value
Set value(SV)
*
1 At temperature rise: Area in which alarm condition is kept
At temperature fall : Area in which non-alarm condition is kept
*
2 At temperature rise: Area in which non-alarm condition is kept
At temperature fall : Area in which alarm condition is kept
*
1
*
2
Area in which non-alarm
condition is kept
LBA deadband
Input circuit
Computation
Output circuit
Actuator
Controlled object
g
f
e
c
d
SV
PV
MV
MV
PV
TIO
