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Chapter 4 Applied Operations
4.2
Alarm Hysteresis
■ Standby
Sequence
■ Standby
Sequence
Restart
■ Alarm Latch
4-6
●
When the alarm is used, alarm output hysteresis may be set according to
the figure below:
Upper Limit Alarm
Alarm Hysteresis
Alarm Value
●
Under the "alarm hysteresis 1 to 2" parameters (advanced function level ),
you can independently set the alarm hysteresis. The initial value is "0.2°C or
F". (analog input initial value is "0.02%FS")
°
●
When the first alarm is triggered, the "standby sequence" can temporarily
inactivate the alarm output. Alarm output will continue to be effective during
subsequent alarm events.
●
For example, during standard heating applications if the standard "low level"
alarm is used, then when the controller is turned on the alarm function will
be effective. But if using the "standby sequence", then the first time the
heating alarm output will not be effective, rather the temperature must
exceed the alarm set point before the alarm is activated. When the
temperature is lower than the alarm set point, the alarm output is effective.
●
After alarm output, the standby sequence is cancelled. But by resetting the
"standby sequence" parameter (advanced function level ) you can
reactivate the standby sequence.
For details, please see the "standby sequence" parameter in "Chapter Five,
Parameters" .
●
The "alarm latch" function sets the alarm output as the permanent
connection status, regardless of temperature variations.
●
The alarm latch may be cancelled when disconnecting the power. (Note:
when switching to initial level, communication level or advanced function
level, alarm latch will be cancelled.)
Lower Limit Alarm
Alarm Hysteres
Alarm Value
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