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6 Handling of Errors and Maintenance
6 - 4 EtherCAT Communication Unit USER’S MANUAL (I574-E1)
6-1-2 Troubleshooting
Errors related to the EtherCAT Communication Unit
Problem Cause and possible corrections
Both the RUN and ERR indicators are
OFF
Power is not supplied correctly to the Communication Unit. Check that the Commu-
nication Unit is mounted correctly onto the inverter, and that the inverter power sup-
ply is wired correctly. Eliminate the cause of the power supply interruption, turn the
inverter power supply OFF, and then restart it.
ERR indicator is lit red Check that the Communication Unit is mounted correctly onto the inverter.
The Communication Unit is faulty. Replace the Communication Unit.
ERR indicator is flashing red The setting of the rotary switches for node address setting is invalid. Check the
setting of the rotary switches for node address setting, turn OFF the power supply
of the inverter, and then restart it.
There is an error in the Slave Unit's EEPROM memory data. Use the tool to ini-
tialize the settings.
The Sync Manager setting is invalid. Change to a correct setting.
An error occurred in communications. Check the connection of the communica-
tions cables and the length of the cables.
In addition, take noise control measures such as mounting the clamp core on the
communication cable.
If the ERR indicator remains flashing even after checking the above items, replace
the slave.
RUN indicator remains flashing green
and status does not change
There was a status transition instruction from the host system during operation, and
a transition was made to a status other than Operational. Refer to the Master Unit's
manual, and check that the host Master Unit is operating correctly.
Errors related to the network
Problem Cause and possible corrections
L/A IN and L/A OUT indicators remain
OFF
Slaves are not connected to the network.
Check that the Master Unit is operating correctly. If using an OMRON Master
Unit, check the Master Unit mode and the slave node addresses.
If using a Master Unit from another manufacturer, refer to the user's manual for
that master.
Check that the communications cable is wired correctly.
Check that the Communication Unit is mounted correctly onto the inverter, and
that the power supply is wired correctly. Eliminate the cause of the power supply
interruption, turn the inverter power supply OFF, and then restart it.
Check the connector wiring to make sure that the communications cables are not
disconnected.
If the L/A IN and L/A OUT indicators of a certain slave remain OFF, replace the
corresponding slave.
If there are devices that generate noise, take necessary measures against the
noise to protect the Master Unit, Communication Unit and communications
cables. Mounting clamp cores on the communication cable, near the connectors
will be effective.
L/A IN and L/A OUT indicators remain
flashing green
The slave status has not transitioned to Operational. Refer to the Master Unit's
manual, and check that the Master Unit is operating correctly.
If the L/A IN and L/A OUT indicators of a certain slave remain flashing, replace
the corresponding slave.
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