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DIGITAL PID CONTROLLER
28
3) Alarm (ALARM1,2) function
(1) Delay time of alarm
(2) LBA (Control Loop Break Alarm)
① How to set up
② Description of operation
The T30 series has two separate alarm outputs, and in the setting menu,
alarms may be chosen among 21 types, and the hysteresis, delay time for
the alarm output may be set.
Please find the alarm code with the desired function in the "Alarm out
type and Selection code" table on the page 26 and use it to set the
alarm output type in the settings mode.
If you set the alarm delay time, alarm (1 or 2) output waits for the delay
time after receiving the alarm. However, it is not applicable when the alarm
is turns off. During the delay time the alarm (ALM) output lamp blink 0.5
second intervals to displays the current alarm is waiting to alert.
LBA is functionality where it triggers an alarm when there is no change in
input while the difference is in consistent state (it assumes there is certain
problem in the control loop). Therefore if the control loop is not in a normal
working mode, it can be utilized for detection. E.g. output is generated if
there are problems with control unit and other problems or can be used for
heater disconnection.
Please set value of LBA two times of the normal integral time setting.
In addition, LBA can be set to automatically by the auto turning function.
In this case value will be set up automatically two times of integral times.
Control loop break alarm consists to alert you Control loop break by detect
Variation during setting time when P.I.D calculations (On time/period of output)
is 0% or 100%.
ⅰ.
When P.I.D calculations stays 100% more than LBA setting time, Break
alarm will be turned on if calculations is not increase more than 2℃.
(In positive action will turned on if calculations does not fall more than 2 ℃.)
ⅱ. When P.I.D calculations stays 0% more than LBA setting time, Break
alarm will be turned on if calculations is not fall more than 2℃.
(In positive action it will turned on if calculations does not increase more
than 2 ℃.)
Alarm 1 delay time setting
Alarm 2 delay time setting
Alarm 1 delay time setting
Alarm 2 delay time setting
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