62
6. Others
Troubleshooting
If you observe abnormal sound, odor, smoke, or heat generation from the instrument, turn off the power at
once.
In addition, if you consider sending the instrument in for repair, check the following points before it.
Situation
Possible cause
Solution
Display
The display does not light up.
Auxiliary power is not applied to MA and MB
terminals.
Apply auxiliary power supply.
When auxiliary power is
applied, the display does not
light up for a short time.
This is not an error. For a few seconds after
charging auxiliary power, the internal circuit is
being initialized.
Use it as it is.
The backlight does not light up.
The backlight may be set to
‘auto off (Auto).’
*When it lights up by pressing any operation
button, it is set to
‘auto off.’
When it is set to auto off, it automatically
goes off in 5 minutes.
Use it as it is or change the setting to
‘ON
(Hold).
’
For details, refer to
The display becomes black.
It may become black due to static electricity.
It will go off after a while.
The
‘End’ display remains.
It is in the setting mode.
Press the SET button.
Me
as
u
rem
ent
er
ro
r
The current and voltage errors
are large.
The settings for VT/Direct voltage and CT
primary current may be incorrect.
Check the settings for VT/Direct voltage and
CT primary current.
Current and voltage are correct,
but active power and power
factor errors are large.
The wiring for VT/CT and the instrument may
be incorrect.
Check the wiring for VT/CT and the
instrument.
The power factor error is large. If input current is smaller than the rating, the
error will become large. (approximately 5% or
less of the rated current)
This is not an error. Use it as it is, or if the
error is troublesome, change the CT
according to the actual current.
The displayed active power is
different from that calculated
by multiplying the displayed
current, voltage, and power
factor.
If the current and voltage AC waveforms distort
due to harmonics, the value will not be the
same as the calculated value. (For current
waveforms without harmonics, the calculated
value matches with the displayed value.)
Use the instrument as it is.
The total harmonic RMS value
of harmonic current is quite
different from the current value.
The distortion ratio (content rate) is well over
100%.
(For measurement of inverter secondary side
output)
Check the measured item.
The current value measured by
this instrument is different from
that measured by other
measuring instrument, such as
a clamp meter. The difference
exceeds an acceptable level.
If the comparative measuring instrument uses
the average value method, the AC waveform
will distort due to harmonics, and the error of
the comparative instrument will become large.
(This instrument uses the RMS value method.)
Compare with a current value of a measuring
instrument that uses the RMS value method.
On the Max/Min value screen,
the present value is displayed
beyond the range of maximum
and minimum values.
During the starting current delay time, the
maximum value is not updated. Therefore, the
displayed present value may exceed the
maximum value.
Use the instrument as it is.
O
p
er
atio
n
In the setting mode, setting
change is not possible.
When
blinks at the bottom left of the
screen, it is in the setting confirmation mode.
Therefore, setting change is not possible.
Enter the setting mode to change the
settings.
When the screen enters the
setting mode, the PASS 0000
display appears
The password protection is enabled.
Enter the password you set up. The factory
default password is
‘0000.’
For details, refer to
O
th
er
s
Maximum and minimum values
change.
The values will be cleared if you change a
setting such as phase wire system, VT/Direct
voltage, or CT primary current.
It is necessary to record the data before
changing the setting.
The settings you have not
changed change.
If you change a setting such as phase wire
system, VT/Direct voltage, or CT primary
current, some items will return to the default
settings.
Set up the item, where settings have
returned to the default, again. For details,
refer to
Initialization of Related Items
When Max/Min value or active
energy values are cleared, the
PASS 0000 display appears
The password protection is enabled.
Enter the password you set up. The factory
default password is
‘0000.’
For details, refer to
Co
mm
u
n
ica
tion
COM on the LCD blinks.
(ON for 0.25 second/OFF for
0.25 second)
Communication errors may be occurring in
MODBUS RTU such as register address error
or communication rate setting error
Check the register address and
communication settings.
If a correct MODBUS RTU communication
message is received, COM will light up.
Содержание ME96SSEB-MB
Страница 64: ...63 7 Installation Dimensions ME96SSEB MB mm ...
