Mitsubishi Electric ME96 Series, Manual

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Operating Instructions
» Changing Upper/Lower Limits for Alarm Activation and Cancellation
»
During Alarm Generation
Alarm condition: When a measured value exceeds the alarm value setting, the screen begins to flash and the alarm contact closes.
Alarm cancelled: When the alarm is cancelled, the screen stops flashing and the alarm contact opens.
»
Alarm Cancel
The alarm can be reset automatically or manually. The alarm recovery method varies according to the reset method setting.
»
Alarm delay Time
Alarm reset method
Measurement value > Upper limit alarm value
(or < Lower limit alarm value)
Measurement value < Upper limit alarm value
(or > Lower limit alarm value)
Alarm contact
Screen
Automatic
(Auto)
Manual
(Hold)
Screen
Alarm contact
Open
RESET
When measurement values exceed the upper/lower limit values that have been set, an alarm activates and the screen begins to blink.
or will flash
or will flash
(Alarm activated)
Closed
Closed
Normal display
Normal display
(Alarm on hold)
Closed Open
(Alarm cancelled)
or light up
If the item that caused the alarm is displayed on
the screen, the digital value, unit (A, V, W, var,
PF, HZ, %, DM, THD) and phase (1, 2, 3, N) will
be displayed as shown in the table below. If the
item is not displayed on the screen, the screen will
not flash.
Digital value
Flashing *
Light up
Light up
Unit
Flashing
Flashing
Light up
Phase
Flashing *
Flashing *
Light up
Alarm activated
Alarm on hold
Alarm cancelled
Alarm status
* Only flashes if the phase that caused the alarm is being displayed.
Automatic (Auto)
Manual (Hold)
RESET
RESET
RESET
The alarm resets automatically when the measurement value returns to within the upper/lower limit set value.
The alarm setting changes to “on hold” even after the measurement value becomes returns to within the upper/lower limit value setting. Once the
value returns to within the upper/lower limit value set, perform the following alarm recovery operations.
(Note: Alarm recovery operations cannot be carried out from the maximum/minimum value display screen or digital input screen.)
<To select item and cancel alarm>
When the item that caused the alarm is displayed, press the button to deactivate the alarm.
For items with phases such as current and voltage, it is necessary to
press the button for each phase to cancel the alarm.
<To cancel alarms for all items>
To cancel alarms for all items at once (batch), press the button for 2 s when in operating mode.
If an alarm delay time has been set, alarm notification begins only when the measurement value exceeds the upper/lower limit
alarm value for a period longer than the alarm delay time.
» Harmonic Display
The harmonic effective value, distortion ratio and content
ratio can be displayed. To do so, first set the harmonic
display (set-up menu: 3.2).
<Harmonic current “total” Display example>
<Harmonic current “total” (distortion rate) Display example >
<Harmonic voltage “5th degree” Display example>
1
st
line: 1-phase RMS value
2
nd
line: 2-phase RMS value
3
rd
line: 3-phase RMS value
4
th
line: Degree number
1
st
line: 1-phase distortion ratio (content rate)
2
nd
line: 2-phase distortion ratio (content rate)
3
rd
line: 3-phase distortion ratio (content rate)
4
th
line: Degree number
RMS
Distortion
(content) ratio
RMS
Distortion
(content) ratio
RMS
Distortion
(content) ratio
3rd, 5th, 7th, 9th,
11th, 13th, 15th,
17th, 19th, 21st,
23rd, 25th, 27th,
29th and 31st
N-phase harmonic current Harmonic voltage Harmonic current
Degree
» Changing the Harmonic Degree Display
Press the or button to change the harmonic degree.
Alarm reset method Cancellation method
1st (fundamental)
Harmonic total
Previous
measurement
screen
Next
measurement
screen
Harmonic current
Current total effective value
Current total distortion ratio
(content rate)
Current 1 st -degree effective value
Current 31 st -degree effective value
Current 31 st -degree distortion ratio
(content rate)
Displayed in order: 3rd,
5th, 7th, 9th, 11th, 13th,
15th, 17th, 19th, 21st,
23rd, 25th, 27th, 29th
Voltage total effective value
Voltage total distortion ratio
(content rate)
Voltage 1 st -degree effective value
Voltage 31 st -degree effective value
Voltage 31 st -degree distortion ratio
(content rate)
Displayed in order: 3rd,
5th, 7th, 9th, 11th, 13th,
15th, 17th, 19th, 21st,
23rd, 25th, 27th, 29th
PHASE
N-phase harmonic current
Current total phase N effective value
Current 1 st -degree phase N effective value
Current 31 st -degree phase N effective value
Displayed in order: 3rd,
5th, 7th, 9th, 11th, 13th,
15th, 17th, 19th, 21st,
23rd, 25th, 27th, 29th
Harmonic voltage
PHASE
PHASE PHASE
DISPLAY DISPLAY DISPLAY DISPLAY
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