Mitsubishi Electric ME96SSRA-MB, Руководство пользователя

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5. Operation
71
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 34 and after.)
■
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.
Alarm cancel method
Measurement value ≥ Upper limit value
(
or Measurement value ≤ Lower limit value)
Measurement value < Upper limit alarm value
(or Measurement value > Lower limit alarm value)
Automatic
(Auto)
Display
, or or flickers
Normal display
Output (Alarm
relay contact)
Closed Opened
Manual
(
HoLd)
Display
, or or flickers
(Alarm generation)
, or turns ON
(Alarm retention)
Normal display
(Alarm cancellation)
Output (Alarm
relay contact)
Closed Closed Opened
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 Digital value Unit Phase
Alarm generation Flickering* Flickering Flickering*
Alarm retention On Flickering Flickering*
Alarm cancellation On On On
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 blinks.
■
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
Monitored phase
3-phase 4-wire
3-phase 3-wire
(3CT,2CT)
1-phase 3-wire
(1N2)
1-phase 3-wire
(1N3)
Upper limit current, current demand 1, 2, 3 1, 2, 3 1, N, 2 1, N, 3
Lower limit current, current demand 1, 2, 3 1, 2, 3 1, 2 1, 3
Upper limit N-phase current, N-phase current demand N
― ― ―
Lower limit N-phase current, N-phase current demand N
― ― ―
Upper limit voltage (L-L) (Note 1) 12, 23, 31 12, 23, 31 1N, 2N, 12 1N, 3N, 13
Lower limit voltage (L-L) (Note 1) 12, 23, 31 12, 23, 31 1N, 2N, 12 1N, 3N, 13
Upper limit voltage (L-N) 1N, 2N, 3N
― ― ―
Lower limit voltage (L-N) 1N, 2N, 3N
― ― ―
Upper limit active power, reactive power, power factor Total Total Total Total
Lower limit active power, reactive power, power factor Total Total Total Total
Upper limit frequency 1N 12 1N 1N
Lower limit frequency 1N 12 1N 1N
Harmonic current total RMS value 1, 2, 3 1, 2, 3 (note 2) 1, 2 1, 3
Harmonic current total RMS value N-phase N
― ― ―
Harmonic voltage total distortion ratio 1N, 2N, 3N 12, 23 1N, 2N 1N, 3N
Upper limit rolling demand Total Total Total Total
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.
Note2: Only 3-phase 3-wire (3CT) is measured for the phase 2 harmonic current.
* Does not flicker when displaying phases
where no alarm occurred.
RESET
Upper/lower limit
indicator