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Chapter 11 TROUBLESHOOTING
If any problem or error occurs during DeviceNet communication, follow the troubleshooting procedures given
below.
No
Phenomenon/Symptom
None of the LEDs on the
1
communications card would
light.
er4
alarm cannot be reset
2
(The MS LED lights in red).
The NS LED lights in red.
3
er5
(
alarm cannot be reset.)
The NS LED blinks in red.
4
er5
(
alarm has occurred.)
5
The NS LED would not light.
The NS LED keeps blinking in
6
green and does not come to
stay on in green.
Even though the NS LED
lights in green, the settings for
7
run command or speed
command cannot be
validated.
Although the speed command
8
has been validated, the actual
speed is different from it.
• The communications card is not properly mounted.
• The communications card is faulty.
• The communications card is not properly mounted.
• The communications card is faulty.
• Other type of communications card is mounted.
• The same node address is double assigned in DeviceNet.
• There is a mismatch in baud (data) rate.
• The network power (24 V) is not properly supplied.
• Cabling for DeviceNet communications is not properly done.
• The inverter has not restarted after modification of the DIP switch
configuration.
• The cable was broken during communication.
• The I/O scan interval is too short.
• The node address for the communications card is improper.
• The cable for DeviceNet communications was broken.
• The master does not request a connection.
• The I/O scan interval has been set to be too short at the start of
communication.
• The I/O area is invalidly mapped.
• There is no I/O connection.
• Neither NetCtrl nor NetRef is set to "1."
• On the inverter, the higher-priority run command or speed
command is enabled.
• There is a mistake in the selection of I/O Assembly Instances.
• The inverter has not restarted after modification of any of the o31
and o40 to o43 data.
• Refer to the FRENIC-MEGA Instruction Manual, Chapter 6,
Section 6.3.1 "Motor is running abnormally."
36
Probable Causes
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