Troubleshooting - Mitsubishi Electric ME96SSRA-MB User Manual

6. Other

6.6. Troubleshooting

In the case of abnormal noise, odor, smoke, or heat generation from this instrument, turn it off at once.
Check the followings before you ask for repair.
Condition
The display is not lit.
When the auxiliary power supply
is impressed, display is not lit
soon.
The back light is not lit.
The display becomes black.
"End" display remains.
The current and voltage have
large errors.
The current and voltage are
correct, but the active power,
reactive power, and power factor
have large errors.
Measured values of PF are
including large error.
The displayed active power is
different from the active power
that is calculated by multiplying
the displayed current, voltage,
and power factor.
The total effective harmonics
value from the harmonic current
is very different from the current
value.
The current measured by
another measurement
instrument (such as a clamp
meter) is different from the
current measured by this
instrument. (More than the
tolerance)
Analog output has a large error.
Pulse output has a large error.
On the maximum/minimum
value display screen, a present
value that is outside of the
maximum/minimum range is
displayed.
Cannot change the settings in
the setting mode.
"PASS 0000" appears when
trying to change the setting
mode.
Maximum value and minimum
value changed.
The values of the setting items
that were not supposed to
change have changed.
"PASS 0000" appears when
trying to clear the energy or
maximum/minimum value.
Possible cause
Auxiliary power supply is not impressed on
MA and MB terminals.
This is not an error. For about a few seconds
after auxiliary power source is charged,
initialization of internal circuit is carried out.
The back light may be set to auto off (Auto). (If
it turns on after you press an operation button,
it means the backlight is set to auto off.)
It may become black owing to static electricity.
The product is still in the setting mode.
The settings for VT / direct voltage and CT
primary current may be incorrect.
The wiring for VT/CT or for the measurement
instrument may be incorrect.
If the input current is smaller than the rating,
error becomes large.
(about 5% or below of rated current)
If the AC of the current and voltage
deteriorate due to harmonics, it will not be the
same as the calculated value.
(For AC without harmonics, the calculated
value will match with the displayed value.)
The distortion factor (content factor) is way
over 100%.
(Such as measurement of the inverter
secondary side output)
If another measurement instrument uses the
average method for measuring, the
measurement instrument used will have a
larger error when the AC deteriorates due to
harmonics.
(This measurement instrument uses the RMS
value method.)
If the wiring to the receptor is long, the error
may increase.
When the pulse unit is set to the minimum
value and the pulse width is set to 0.500s or
1.000s, the pulse output cannot follow if the
load is too large, which can result in a
decrease in the pulse output number.
During the starting current delay time, the
maximum value is not updated, so the
present value that is over the maximum value
may be displayed.
If at the bottom of the screen is blinking,
you are in the set value confirmation mode.
Settings cannot be changed in this mode.
The password protection setting is turned to
valid.
These are cleared if the settings for the phase
wire, VT/direct voltage, and CT primary
current are changed.
Some setting items return to the default
values when settings for the phase wire
method, VT/direct voltage, and CT primary
current are changed.
The password protection setting is turned to
valid.
85
Solution
Impress auxiliary power supply.
Use it as it is.
When the auto off is enabled, it automatically
turns off in 5 minutes.
Continue using it as it is or change the setting
to HoLd (it stays on). (Refer to page 33)
It goes off after a while.
Press .
SET
Please check the set values for VT / direct
voltage and CT primary current.
Please check the wiring for VT/CT and for the
measurement instrument.
This is not an error, or uses it as it is, or if error
is troublesome, changes the CT according to
the actual current to be used.
Please continue using the instrument as it is.
Please check the measured item.
Please compare the currents using a
measurement instrument that uses the RMS
value method.
Perform the zero and span adjustment for
analog output. (Refer to page 60.)
Review the pulse unit or pulse width setting
(refer to pages 38).
Please continue using the instrument as it is.
Please go to the setting mode to change
settings.
Please enter the set password. Also, the
default password is "0000" (Refer to page 76)
Make a note of the values before changing
the settings
Please refer to "Initializing Related Items by
Changing Settings" (page 51) and reconfigure
the setting items that returned to their default
values.
Please enter the set password. Also, the
default password is "0000" (Refer to page 76)