Usage According To Purpose (Alarm, Periodic Active Energy, Rolling Demand, Operating Time, Password, Etc.); Display And Operation Of The Upper/Lower Limit Alarm - Mitsubishi Electric ME96SSHA-MB User Manual

5. Operation
5.2. Usage According to Purpose (Alarm, Periodic Active Energy, Rolling Demand, Operating
Time, Password, etc.)
The following explains usage according to the purpose during operation.

⚫ Display and operation of the upper/lower limit alarm

When the value exceeds the upper or lower limit setting value set in advance, the display flickers and alarm can be output.
(For more information about how to set the upper/lower limit alarm, refer to page
■
Alarm indicator
When the measurement element with an upper/lower limit alarm is displayed on the bar graph, "▲" flickers on
the bar graph to indicate the upper/lower limit.
■
Behavior During Alarm Generation
Alarm condition: When measurement value exceeds alarm value, display flicker and an alarm contact closes.
Alarm cancel: When alarm is canceled, display flickers normally and alarm contact opens.
Note: When the alarm delay time is set, an alarm is generated only when the alarm value is continuously beyond the
upper/lower limit alarm value for the delay time.
Measurement value ≥ Upper limit value
Alarm cancel method
(or Measurement value ≤ Lower limit value)
Display
Automatic
(Auto)
Output (Alarm
relay contact)
Display
(
Manual
HoLd)
Output (Alarm
relay contact)
Note 1: When the measurement element where the alarm generated exists on the display screen, the display for the digital
value, unit (A, V, W, var, PF, Hz, %, DM,THD), and phase (1, 2, 3, N) will be based on the alarm status according
to the following table. If it does not exist on the display screen, it does not flicker.
Alarm status
Alarm generation
Alarm retention
Alarm cancellation
Note 2: When the backlight flickering setting is set to ON (flicker) during alarm generation, the backlight also flickers when
an alarm is generated.
Note 3: On the maximum/minimum value display screen, the present value (middle of the digital display) and
, or
■
Monitoring phase for upper/lower limit alarm element
The phase that monitors the upper/lower limit alarm differs according to the measurement item. For more details,
refer to the following table.
Upper/lower limit alarm element
Upper limit current, current demand
Lower limit current, current demand
Upper limit N-phase current, N-phase current demand
Lower limit N-phase current, N-phase current demand
Upper limit voltage (L-L) (Note 1)
Lower limit voltage (L-L) (Note 1)
Upper limit voltage (L-N)
Lower limit voltage (L-N)
Upper limit active power, reactive power, power factor
Lower limit active power, reactive power, power factor
Upper limit frequency
Lower limit frequency
Harmonic current total RMS value
Harmonic current total RMS value N-phase
Harmonic voltage total distortion ratio
Upper limit rolling demand
Note1: For phase 12 (or phase 31) at 1-phase 3-wire, alarm monitoring is executed using a value that is two times the set
upper/lower limit alarm value.
3-phase 3-wire
Note2: Only
, or or
flickers
Closed
, or or
flickers
(Alarm generation)
Closed
Digital value Unit
Flickering* Flickering
On
Flickering
On On
blinks.
(3CT) is measured for the phase 2 harmonic current.
34 and after.)
Measurement value < Upper limit alarm value
(or Measurement value > Lower limit alarm value)
Normal display
,
or turns ON
(Alarm retention)
Closed
Phase
Flickering*
* Does not flicker when displaying phases
Flickering* where no alarm occurred.
On
Monitored phase
3-phase 3-wire
3-phase 4-wire
(3CT,2CT)
1, 2, 3 1, 2, 3
1, 2, 3 1, 2, 3
N ―
N ―
12, 23, 31 12, 23, 31
12, 23, 31 12, 23, 31
1N, 2N, 3N ―
1N, 2N, 3N ―
Total Total
Total Total
1N 12
1N 12
1, 2, 3 1, 2, 3 (note 2)
N ―
1N, 2N, 3N 12, 23
Total Total
71
Upper/lower limit
indicator
Opened
Normal display
(Alarm cancellation)
Opened
1-phase 3-wire 1-phase 3-wire
(1N2) (1N3)
1, N, 2 1, N, 3
1, 2 1, 3
― ―
― ―
1N, 2N, 12 1N, 3N, 13
1N, 2N, 12 1N, 3N, 13
― ―
― ―
Total Total
Total Total
1N 1N
1N 1N
1, 2 1, 3
― ―
1N, 2N 1N, 3N
Total Total