5.1.6 Setting Burnout Action (for the model code 3 only)
Set the burnout action in
[D39:BURN OUT]
. Set “OFF”, “UP”,
or “DOWN.”
CAUTION
• Changing the burnout action direction resets the input
adjusted value and the wiring resistance corrected
value.
• Changing the input range resets the input adjusted
value.
•
Execute the wiring resistance correction when the
burnout action direction or input wiring is changed.
5.1.7 Wiring Resistance Correction (for the model code 3 only)
When an error occurs due to the influence of the input wiring
resistance, the input can be corrected. Apply a stable input as
shown below and select EXECUTE in
[P01: WIRING R]
. The
correction is also required when the direction of burnout action
is changed from UP (DOWN) to DOWN (UP) or the wiring for
input is changed.
VJ77
or
JHT200
Voltage
generator
mV Input
VJUK
Two signal lines are connected to
the same terminal of one side.
RTD Input
VJ77
or
JHT200
VJUK
Short-circuit at the cable end.
Thermocouple Input
VJUK
VJ77
or
JHT200
Short-circuit at the cable end.
5.1.8 External Input Resistance Correction
(for the model code 1 only)
For current input, set the external resistance to
[D13: IN
RESIST]
. There is a difference between this value and the
actual external resistance. If this difference causes an error,
the input can be corrected.
To perform correction, wire as shown in the figure below, apply
a stable input equivalent to 100%, and set
[P40:RESISTOR
ADJ]
to EXECUTE.
If you need perform correction again such as when the
external resistance is changed, reset the correct value. To do
so, set
[P40: RESISTOR ADJ]
to RESET.
A current
generator
VJHK
R
：
External resistor
R
1
3
5.2 Settings Related to Alarm Output
5.2.1
Alarm Setpoint
Set the alarm-1 setpoint and alarm-2 setpoint numerically
in
[E01: SET POINT1]
and
[E02: SET POINT2]
for
thermocouple input and RTD input or in
[E03: SET POINT1]
and
[E04: SET POINT2]
for mV input. Set them in [°C/K] for
temperature input or in [%] for mV input.
•
Setting range: 0 to 100% of input range
•
Setting resolution: 0.1% (for mV input), 4 significant digits
(for temperature input)
5.2.2 Direction of Alarm Action
Select the direction of alarm-1 action and that of alarm-2
action from among HIGH ALM (high-limit alarm) and LOW
ALM (low-limit alarm) in
[E05: ALM1 ACTION]
and
[E06:
ALM2 ACTION]
.
•
To activate alarm status when input signal ≥ alarm setpoint,
select HIGH ALM.
•
To activate alarm status when input signal ≤ alarm setpoint,
select LOW ALM.
5.2.3 Hysteresis
Set the alarm-1 hysteresis and alarm-2 hysteresis numerically
in
[E07: HYSTERESIS1]
and
[E08: HYSTERESIS2]
for
thermocouple input and RTD input or in
[E09: HYSTERESIS1]
and
[E10: HYSTERESIS2]
for mV input.
Hysteresis is a value added to the alarm setpoint in order for
an alarm status to be released (to normal) after the alarm
status has been activated. The alarm status will be released in
the following conditions, depending on the direction of alarm
action.
* When HIGH ALM (high-limit alarm) is set: Alarm is released
when input signal < (alarm setpoint - hysteresis).
* When LOW ALM (low-limit alarm) is set: Alarm is released
when input signal > (alarm se hysteresis).
Set them in [°C/K] for temperature input or in [%] for mV input.
•
Setting range: 0 to 100% of input range
•
Setting resolution: 0.1% (for mV input), 4 significant digits
(for temperature input)
5.2.4 Alarm ON Delay and Alarm OFF Delay
Set the alarm-1 ON delay and alarm-2 ON delay numerically in
[E11: ON DELAY1]
and
[E12: ON DELAY2]
. Set the alarm-1
OFF delay and alarm-2 OFF delay numerically in
[E13: OFF
DELAY1]
and
[E14: OFF DELAY2]
.
An alarm ON delay is a delay time from the establishment of
alarm conditions to its output; an alarm OFF delay is a delay
time from the establishment of return-to-normal conditions to
its output.
•
Setting range: 0 to 999 seconds
• Setting resolution:
1 second (However, about 0.2 second is
to be added to the set time to prevent wrong operation.)
For example, when an alarm ON delay is set to 1 second,
alarm output is generated if alarm status continues for 1
second or more after the input value exceeds the alarm
setpoint. Furthermore, when an alarm OFF delay is set
to 2 seconds, alarm output is released if normal condition
continues for 2 seconds or more after the input value has
returned to normal from the alarm status.
5.2.5 Direction of Relay Action
Select the direction of relay energizing in alarm-1 normal
condition and alarm-2 normal condition from among NRM DE-
ENERGIZED (de-energized under normal condition) and NRM
ENERGIZED (energized under normal condition) in
[E15: RL1
ACTION]
and
[E16: RL2 ACTION]
.
6.
DESCRIPTION OF ALARM ACTIONS
This chapter describes examples of alarm actions under the
following conditions.
Item
Alarm 1
Alarm 2
Parameter
Setpoint Parameter
Setpoint
Direction of alarm
action
E05: ALM1 ACTION High-limit
alarm
E06: ALM2 ACTION Low-limit
alarm
Alarm setting
E03: SET POINT1
80%
E04 : SET POINT2
15%
Hysteresis
E09: HYSTERESIS1 10%
E10 : HYSTERESIS2 5%
Alarm ON delay
E11: ON DELAY1
1 sec
E12 : ON DELAY2
3 sec
Alarm OFF delay
E13: OFF DELAY1
2 sec
E14 : OFF DELAY2 4 sec
Description of
alarm actions
The alarm is output if the
condition where the input value
is 80% or more of high-limit
alarm continues for 1 second
or more.
After the alarm is output, when
the condition where the input
value is less than 70% of
high-limit alarm continues for
2 seconds or more, the status
returns to normal.
The alarm is output if the
condition where the input value
is 15% or less of low-limit
alarm continues for 3 seconds
or more.
After the alarm is output, when
the condition where the input
value is more than 20% of
low-limit alarm continues for
4 seconds or more, the status
returns to normal.
Figure 6.1
Alarm-1 action
Alarm-2 action
Normal
Normal
Normal
Normal
Alarm
Alarm
[
％
]
0
20
15
40
60
80
100
1 s.
2 s.
3 s.
4 s.
Alarm-2 hysteresis (5%)
Alarm-1 hysteresis (10%)
Alarm-1 setpoint (80%)
Alarm-2 setpoint (15%)
Elapsed time s.
[1]
[2]
[3]
[4]
Alarm-1
ON delay
Alarm-2
ON delay
Alarm-2
OFF delay
Alarm-1
OFF delay
Alarm conditions established
Alarm conditions
established
Normal conditions
established
Normal conditions established
High-limit alarm ON
Low-limit alarm ON
High-limit alarm OFF
Low-limit alarm OFF
[1] Alarm status does not continue for more than 1 second after the
alarm conditions are established at alarm 1.
[2] Normal status does not continue for more than 2 seconds after
the normal conditions are established at alarm 1.
[3] Alarm status does not continue for more than 3 seconds after the
alarm conditions are established at alarm 2.
[4] Normal status does not continue for more than 4 seconds after
the normal conditions are established at alarm 2.
4
IM 77J01U21-01E
3rd Edition