Mitsubishi Electric ME96 Super-S Series Manual page 26

Operating Instructions
»Changing Upper/Lower Limits for Alarm Activation and Cancellation
When measurement values exceed the upper/lower limit values that have been set, an alarm activates and the screen begins to blink.
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.
Measurement value > Upper limit alarm value
Alarm reset method
Screen
Automatic
(Auto)
Alarm contact
Screen
Manual
(Hold)
Alarm contact
Alarm Cancel
»
The alarm can be reset automatically or manually. The alarm recovery method varies according to the reset method setting.
Alarm reset method
Automatic (Auto)
Manual (Hold)
Alarm delay Time
»
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 voltage "5th degree" Display example>
<Harmonic current "total" (distortion rate) Display example >
1 line: 1-phase distortion ratio (content rate)
st
2 line: 2-phase distortion ratio (content rate)
nd
3 line: 3-phase distortion ratio (content rate)
rd
4 line: Degree number
th
Harmonic current
Degree Distortion
RMS
(content) ratio
Harmonic total
1st (fundamental)
3rd, 5th, 7th, 9th,
11th, 13th, 15th,
17th, 19th, 21st,
23rd, 25th, 27th,
29th and 31st
25
Measurement value < Upper limit alarm value
(or < Lower limit alarm value)
or will flash
Closed
or will flash or
(Alarm activated)
(Alarm on hold)
Closed
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
For items with phases such as current and voltage, it is necessary to
RESET
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
1 line: 1-phase RMS value
st
2 line: 2-phase RMS value
nd
3 line: 3-phase RMS value
rd
4 line: Degree number
th
N-phase harmonic current Harmonic voltage
Distortion Distortion
RMS RMS
(content) ratio (content) ratio
(or > Lower limit alarm value)
Normal display
Open
light up Normal display
RESET
(Alarm cancelled)
Closed Open
Cancellation method
RESET
button to deactivate the alarm.
RESET
button for 2 s when in operating mode.
»Changing the Harmonic Degree Display
Press the or
Harmonic current
Previous
Current total effective value
measurement
Current total distortion ratio
screen
(content rate)
DISPLAY
Current 1 st -degree effective value
Displayed in order: 3rd,
5th, 7th, 9th, 11th, 13th,
15th, 17th, 19th, 21st,
23rd, 25th, 27th, 29th
Current 31 -degree effective value
st
Current 31 -degree distortion ratio
st
(content rate)
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.
Alarm status Digital value
Alarm activated Flashing
Alarm on hold Light up
Alarm cancelled Light up
* Only flashes if the phase that caused the alarm is being displayed.
button to change the harmonic degree.
N-phase harmonic current Harmonic voltage
PHASE
Current total phase N effective value Voltage total effective value
Voltage total distortion ratio
DISPLAY DISPLAY
Current 1 -degree phase N effective value Voltage 1
st
Displayed in order: 3rd, Displayed in order: 3rd,
5th, 7th, 9th, 11th, 13th, 5th, 7th, 9th, 11th, 13th,
15th, 17th, 19th, 21st, 15th, 17th, 19th, 21st,
23rd, 25th, 27th, 29th 23rd, 25th, 27th, 29th
PHASE
Voltage 31
Current 31 st -degree phase N effecti v e val u e
Voltage 31
Unit Phase
Flashing Flashing
* *
Flashing Flashing *
Light up Light up
PHASE
(content rate)
DISPLAY
st -degree effective value
Next
measurement
screen
PHASE
-degree effective value
st
-degree distortion ratio
st
(content rate)