Mitsubishi FR-EPN Instruction Manual page 15

Device.net communications option unit
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(2) Match the condition of the LED with the table above. Most likely, it will
be flashing red or green depending on the software used in the master
station. Once a flashing green LED is achieved, the inverter is ready to
connect to its host and begin motor control operations through the
network.
(3) When inverter power is turned on with the option unit installed, the
option performs a diagnostic self test that can be viewed on the MNS
LED. This test is performed even if the option unit is not connected to
an active network. When power is turned on, the LED flashes green,
then red and finally turns off. The option unit then attempts its duplicate
station number test and will start flashing green within a few seconds if
successful. If unsuccessful, the LED will go solid red.
(4) At this point, your DeviceNet option unit should be installed and running
properly on your DeviceNet network. Replace the front cover on the
inverter paying attention not to cause excess strain on the internal
wiring. Your DeviceNet option is now installed. Please read through
the rest of this manual for information on the advanced features and
detailed operation of this option.
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