Assume Based On Phenomena - Omron KM1 User Manual

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

Assume based on phenomena

Reference page
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2-14
2-14
3-3
A-7
3-4
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2-14
2-28
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2-28
1-8
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1-11
2-2
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