Mitsubishi Electric 800 Series Instruction Manual page 79

Operation
LED on
panel display
FR-A8NP
on the inverter
OFF
0.00
Red (ON)
E.OP1 Red (ON)
78
TROUBLESHOOTING
Possible cause
The
The inverter is affected by the other
network is
nodes.
unstable.
No master is present in the network, or the master
is not properly operating.
The PROFIBUS communication had been
established (the green LED had been ON), but the
master stopped transmitting data to the option unit
during an inverter stop.
A communication cable break occurred after the
PROFIBUS communication had been established
(green LED had been ON).
Communication errors occurred consecutively after
the PROFIBUS communication had been
established (green LED had been ON).
The PROFIBUS communication had been
established (the green LED had been ON), but the
master stopped transmitting data to the option unit
during an inverter operation.
Checkpoint / troubleshooting
Check if any network error has occurred in the other
nodes.
Check the connection and the operation of the
PROFIBUS-DP master.
Check the master ladder, etc., and remove the causes
that disconnect the data transmission between the
master and the option unit.
Check the connection and the wiring of the
communication cable.
Connect a terminating resistor. If a terminating resistor
has been already connected, check that it is
connected properly.
Check the master ladder, etc., and remove the causes
that disconnect the data transmission between the
master and the option unit.