6. Other
55
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
Possible cause
Solution
D
isp
la
y
The display is not lit.
Auxiliary power supply is not impressed on
MA and MB terminals.
Impress auxiliary power supply.
When the auxiliary power supply
is impressed, display is not lit
soon.
This is not an error. For about a few seconds
after auxiliary power source is charged,
initialization of internal circuit is carried out.
Use it as it is.
The back light is not lit.
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.)
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 23)
The display becomes black.
It may become black owing to static electricity.
It goes off after a while.
“End” display remains.
The product is still in the setting mode.
Press
.
M
easu
re
men
t
e
rr
o
r
The current and voltage have
large errors.
The settings for VT / direct voltage and CT
primary current may be incorrect.
Please check the set values for VT / direct
voltage and CT primary current.
The current and voltage are
correct, but the active power and
power factor have large errors.
The wiring for VT/CT or for the measurement
instrument may be incorrect.
Please check the wiring for VT/CT and for the
measurement instrument.
Measured values of PF are
including large error.
If the input current is smaller than the rating,
error becomes large.
(about 5% or below of rated current)
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.
The displayed active power is
different from the active power
that is calculated by multiplying
the displayed current, voltage,
and power factor.
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.)
Please continue using the instrument as it is.
The total effective harmonics
value from the harmonic current
is very different from the current
value.
The distortion factor (content factor) is way
over 100%.
(Such as measurement of the inverter
secondary side output)
Please check the measured item.
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)
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.)
Please compare the currents using a
measurement instrument that uses the RMS
value method.
On the maximum/minimum
value display screen, a present
value that is outside of the
maximum/minimum range is
displayed.
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.
Please continue using the instrument as it is.
Op
er
a
ti
o
n
Cannot change the settings in
the setting mode.
If at the bottom of the screen is blinking,
you are in the set value confirmation mode.
Settings cannot be changed in this mode.
Please go to the setting mode to change
settings.
“PASS 0000” appears when
trying to change the setting
mode.
The password protection setting is turned to
valid.
Please enter the set password. Also, the
default password is
“0000” (Refer to page 46)
Oth
er
Maximum value and minimum
value changed.
These are cleared if the settings for the phase
wire, VT/direct voltage, and CT primary
current are changed.
Make a note of the values before changing
the settings
The values of the setting items
that were not supposed to
change have 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.
Please refer to “Initializing Related Items by
Changing Settings” (page 31) and reconfigure
the setting items that returned to their default
values.
“PASS 0000” appears when
trying to clear the energy or
maximum/minimum value.
The password protection setting is turned to
valid.
Please enter the set password. Also, the
default password is
“0000” (Refer to page 46)
C
o
mmu
n
icat
io
n
COM in the LCD screen is
blinking. (Appears for 0.25sec. /
Disappears for 0.25sec.)
MODBUS RTU® communication error as
follows was detected.
・
Communication setting(Slave address, baud
rate, stop bit and parity) was incorrect.
・
Function code was incorrect.
・
Register address was incorrect. etc.
Review the communication setting, the
function code and the register address and so
on.
If the correct query received, COM is lit.
SET
