How To Use Upper/Lower Limit Alarm Function - Mitsubishi Electric EMU4-FD1-MB User Manual

How to use upper/lower limit alarm function

This device can set the upper/lower limit alarm value for each measured value individually.
<Monitoring items>
Upper limit alarm items
Lower limit alarm items
<Alarm setting>
・Upper limit value Set the upper limit of measured value. For setting value and setting range,
・Lower limit value Set the lower limit of measured value. For setting value and setting range,
・Alarm delay time Set the value in case you want to remove the inrush current of the load, etc. from the objects of
monitoring. Alarm does not occur when the measured value goes below the upper limit or goes over
the lower limit within the configured time. For setting value and setting range,
・Alarm reset method Alarm recovery operation is different according to the alarm reset method.
Reset method
Auto-reset (Auto)
Self-retention
(HoLd)
For setting,
<Alarm occurrence / recovery condition>
Alarm item
Current demand
Phase N current demand
Voltage
Electric power demand
Power factor
Pulse count
Caution: Measured value of pulse count is integrated, so you can reduce it (i.e. clear it to zero) by the preset operation of pulse
count only. For the preset operation of pulse count,
<Alarm indication at alarm status>
No alarm
Digital indication Turn ON
Measured element,
Turn ON
Unit, Phase
*1: Flash (250ms ON / 250ms OFF)
Current demand, phase N current demand, Voltage, Electric power demand,
Power factor, Pulse count
Current demand, Voltage, Electric power demand, Power factor,
Reset the alarm automatically if the measured value goes below the upper
limit or goes over the lower limit.
The alarm is held after the measured value goes below the upper limit or
goes over the lower limit. Alarm is cleared by alarm reset.
page 27. For alarm reset operation,
Alarm reset
Alarm status
method
Upper limit
monitoring
Auto-reset
(Auto)
Lower limit
monitoring
Upper limit
monitoring
Self-retention
(HoLd)
Lower limit
monitoring
Auto-reset Upper limit
(Auto) monitoring
Self-retention Upper limit
(HoLd) monitoring
Alarm occurrence
When indicating the
alarm-occurrence phase
Flash (*1)
Flash (*1)
*2: Flash (500ms ON / 500ms OFF)
Alarm recovery operation
page 55.
Alarm occurrence / recovery condition
Measured value > configured upper limit
Occurrence
(Alarm delay time is available)
Recovery Measured value ≤ configured upper limit
Measured value < configured lower limit
Occurrence
(Alarm delay time is available)
Recovery Measured value ≥ configured lower limit
Measured value > configured upper limit
Occurrence
(Alarm delay time is available)
Retention Measured value ≤ configured upper limit
Measured value ≤ configured upper limit
Recovery
Measured value < configured lower limit
Occurrence
(Alarm delay time is available)
Retention Measured value ≥ configured lower limit
Measured value ≥ configured lower limit
Recovery
Occurrence Measured value ≥ configured upper limit
Recovery Measured value < configured upper limit
Occurrence Measured value ≥ configured upper limit
Retention Measured value < configured upper limit
Recovery Measured value < configured upper limit
page 56.
When indicating When Indicating the
the other phase alarm-occurrence phase
Turn ON
Flash (*1)
(54/71)
p.26,27
p.26,27
page 27.
AND
Alarm reset
AND
Alarm reset
Alarm retention
When indicating
the other phase
Flash (*2) Turn ON
Flash (*2) Flash (*2)