Autonics TZ4ST-24R - Alarm Configuration; Alarm Operation Modes; Alarm Options and Behavior; Loop Break Alarm (LBA)

J-152
TZN/TZ Series
Mode Name Description
AL-A
Standard alarm Alarm output turns ON upon alarm condition, and alarm output turns OFF when condition is cleared.
AL-B
Alarm latch Alarm output turns ON and maintains ON upon alarm condition.
AL-C
Standby
sequence
The rst alarm condition is ignored. It will operate as standard alarm from the second alarm condition. If it is under
alarm condition when power is supplied, it will ignore the condition and operate as standard alarm from the next
alarm condition.
AL-D
Alarm latch
and standby
sequence
It will operate as both alarm latch and standby sequence upon alarm condition. If it is under alarm condition when
power is supplied, it will ignore the condition and operate as alarm latch from the next alarm condition.
Alarm (event)
Alarm output can be congured by combining alarm operation and alarm options. Set the alarm operation in event 1/2 [
EU1
,
EU2
] of parameter group 2, and set the alarm options in alarm option [
AL-T
].
1) Alarm operation
Mode Name Alarm operation Description
ㅁAL-0
- -
Alarm output not used.
AL-1
Deviation
high-limit
alarm
SV
100℃
PV
110℃
OFF ON
H
If the deviation of PV and SV are higher than
the high-limit deviation, the alarm output turns
ON.
High-limit deviation: 10℃
AL-2
Deviation
low-limit
alarm
PV
90℃
SV
100℃
OFFON
H
If the deviation of PV and SV are higher than
the low-limit deviation, the alarm output turns
ON.
Low-limit deviation: 10℃
AL-3
Deviation
high-limit
/low-limit
alarm
PV
90℃
PV
110℃
SV
100℃
OFFON ON
H H
If the deviation of PV and SV are higher than
the high-limit deviation or low-limit deviation, the
alarm output turns ON.
High-limit/low-limit deviation: 10℃
AL-4
Deviation
high-limit
/low-limit
reverse
alarm
PV
90℃
PV
110℃
SV
100℃
OFF OFFON
H H
If the deviation of PV and SV are higher than
the high-limit deviation or low-limit deviation, the
alarm output turns OFF.
High-limit/low-limit deviation: 10℃
AL-5
Absolute
value
high-limit
alarm
PV
90℃
SV
100℃
OFF ON
H
SV
100℃
PV
110℃
OFF ON
H
Alarm output turns ON when PV is higher than
the absolute value.
Absolute value alarm: 90℃ Absolute value alarm: 110℃
AL-6
Absolute
value
low-limit
alarm
PV
90℃
SV
100℃
OFFON
H
SV
100℃
PV
110℃
OFFON
H
Alarm output turns ON when PV is lower than
the absolute value.
Absolute value alarm: 90℃ Absolute value alarm: 110℃
SBA
Sensor break
-
Alarm output turns ON when sensor
disconnection is detected.
LBA
Loop break
-
Alarm output turns ON when loop break is
detected.
※
H: Alarm output hysteresis[
AHYS
]
2) Alarm options
4) Loop break Alarm (LBA)
Diagnose control loop and transmit alarm output through temperature change of control target. During heating(cooling)
control, the alarm output turns ON if the PV does not rise/drop by a specic amount (approx. 2℃) during LBA monitoring
period [
LBA
] while control output amount is at 100%(0%).
※
If the thermal response of the control target is slow, the LBA monitoring period [
LBA
] of parameter group 1 should be set
longer.
※
LBA only operates when the control output amount is 100%(0%) so it cannot be used in current output models.
※
If the alarm output turns ON after the sensor has been disconnected, the alarm output will not turn OFF even after
reconnecting the sensor. To disengage the alarm output, the temperature controller power must be reset.
3) Sensor break alarm
Alarm output turns ON when sensor is not connected or loses its connection during temperature control. Sensor
disconnection can be tested by connecting buzzers or other devices to the alarm output contact. Sensor break alarm output
operates through EV1 OUT or EV2 OUT contacts. Alarm output is disengaged after resetting the power.