Table of Contents
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7 Troubleshooting
No.
When
8
After completion
of the automatic
measurement
9
After completion
of the automatic
measurement
10
After completion
of the automatic
measurement
7 - 4
Problems
The measurement value
cannot be seen for a channel
although the measurement is
complete.
→ The Probe Unit of this
channel has not been
measured.
The measurement value is
smaller than the value
measured with the
Megohmmeter.
The measurement value
varies with each
measurement.
Cause
The Probe Unit will not
Set the channel
be measured if the
numbers in the order 1,
channel number is
2, 3, and n. Also, set the
greater than the setting
Maximum Number of
value of the Maximum
Channels setting
Number of Channels
parameter to the total
setting parameter.
number of channels
(number of Probe
Units).
Due to the parasitic
Use a Megohmmeter or
capacitance component
the manual
between the load
measurement function
including the wiring from
of the K7GE-MG to
the contactor and the
measure the time until
ground, it may take
the final value
some time for the
stabilizes. Set the Time
measurement value to
to Wait to Stabilize
reach its final value
setting parameter to the
after the Megger
measured time with a
voltage is applied. The
small margin added.
K7GE-MG measures
the measurement value
with a stable final value.
Therefore, it is
measured after the time
set by the Time to Wait
to Stabilize setting
parameter. However,
the measurement value
may not have been
stable at the time of
measurement.
This may be an effect of
Set the Average
external noise. The
Processing setting
K7GE-MG is designed
parameter to ON. Also,
for superior removal of
take measures such as
the 50/60 Hz induced
maintaining a distance
noise due to the
between the input line
high-resistance
of the K7GE-MG and
measurements.
the power line of the
However, it may not be
inverter that is
able to completely
operating.
remove large
asynchronous noise
(such as inverter noise).
Insulation Resistance Monitoring Device User's Manual (N224)
Correction
Reference
3-2
Installation on
page 3-3
5-3 Maximum
Number of
Channels on
page 5-6
5-8 Time to
Wait to
Stabilize on
page 5-17
5-9 Average
Processing on
page 5-19
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Table of Contents
Troubleshooting
