4.4 Assume based on phenomena
4-5
Troubleshooting
4.4 Assume based on phenomena
Before you think the product is malfunctioning
If Model KM1 does not operate normally, check applicable items listed below before making a
request for repair.
If the product does not operate normally despite your check, we would like you to return the product
to us via our sales division.
When
Phenomenon
Items to be checked
Action to be taken
Reference page
Operation indicator
LEDs, OUT1,
OUT2, and OUT3,
light up.
Check that the lamp is
flashing in conjunction
with pulse output for
measurement or alarm
output.
If lamps, OUT1, OUT2, and OUT3, light up in
conjunction with pulse output for measurement or
alarm output, the product is normal.
-
Voltage and current
can be measured,
but power cannot be
measured correctly.
Check that the
dedicated CT is not
installed in the reverse
direction.
If negative power is measured, all dedicated CTs
may have been installed in the reverse direction.
If the power close to 0 is measured, one of the two
dedicated CTs may have been installed in the
reverse direction.
2-14
Check that the wiring
is correct.
Perform wiring correctly.
2-14
Check that the type of
the dedicated CT is
correct.
Checking the type of your dedicated CT, set the
dedicated CT of a correct type.
3-3
Large measurement
error
Check that inputs are
within the input range
of the dedicated CT.
Checking the standard of the dedicated CT, supply
current so that the dedicated CT can be within the
range of the standard.
A-7
Current becomes 0 Check that the current
input value is higher
than the current
low-cut value.
Make settings so that the current low-cut value is
lower than the current input value.
3-4
Check that only the
recommended
communication
converter (K3SC-10) is
used.
-
Check that the higher
level systems
(communication
equipment) are
normal.
Check that no error has occurred in the equipment
connected.
-
Check that settings for
communication are
correct.
Check that the communication setting is the same
between the KM1 main unit and the communication
converter.
-
Check that the wiring
is correct.
Perform wiring correctly.
2-14
Check that the
termination resistor
has been installed.
Install termination resistors of 120
Ω
(1/2 W) at the
end of Model KM1 and in the communication
converter.
2-28
Check that the
transmission distance
is within the allowable
maximum range.
Make connections in such a way that the maximum
transmission distance for communication is 500 m
or less.
-
Communication not
allowed
Check that the number
of pieces of equipment
connected to the same
communication line is
within the maximum
number of connected
units.
When CompoWay/F is selected for protocol, the
maximum number of pieces of equipment
connected must be 31 units in the KE/KM series.
When Modbus, it must be 99 units or less in the
KE/KM series (in either case, no base unit is
included).
2-28
Check for duplicates of
slave ID. Or, check
that the setting is
within the range.
Recheck the setting of slave ID.
1-8
Check that the number
of master units is one.
Check that the number of master units is one per
system.
1-11
Check that the number
units connected is
within the limit.
Check the maximum number of units connected.
1-11
At time of
initial
connection
to power
Operation indicator
LED PWR lights up,
and CONN is
flashing.
Check that the
communication
protocol is matched.
Recheck the setting of communication protocol.
2-2
