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9 TROUBLESHOOTING
When a fault occurs where the inverter trips itself and the option unit, check the inverter's operation panel, the
LED on the option unit, and the following checkpoints to identify the cause, then take appropriate
countermeasures. If the fault does not correspond to any of the following faults or if you have any other problem,
please contact your sales representative.
Operation
Panel Display
on the Inverter
LED on
FR-A7NP
Possible Cause Checkpoint / Troubleshooting
0.00
Off
The option unit
is not operating.
The option unit is not mounted properly.
Check if the option unit is mounted properly.
PROFIBUS communication is not
established with the master.
(Incorrect node address setting)
Set the same node address with the master on A7NP
using the node address switches.
(Turn OFF, then ON the power supply after changing the
node address setting on A7NP.)
PROFIBUS communication is not
established with the master.
(Incorrect GSD file has been
registered.)
Register the correct GSD file with a configuration
software, and set the network configuration to the master.
PROFIBUS communication is not
established with the master.
(Incorrect wiring)
Check the wiring of the option unit.
D+ PROFIBUS transmitting/receiving data+ (B line)
D- PROFIBUS transmitting/receiving data- (A line)
⎯
Reset the inverter.
Perform all parameter clear to initialize all parameter
settings, then turn ON the inverter power again.
The network is
unstable.
The network cables are not
connected correctly.
Check if the network cables are connected properly
between the nodes.
The PROFIBUS communication is
not established with the master.
(Unstable bus line)
Connect a terminating resistor. If a terminating resistor
has been already connected, check if it is connected
properly.
The network setting is incorrect.
Check the network setting with the PROFIBUS-DP
network configuration software.
The inverter is affected by the other nodes.
Check if any network error has occurred in the other nodes.
Lit in red
No master is present in the network, or the master is
not properly operating.
Check the connection and the operation of the
PROFIBUS-DP master.