Troubleshooting - Mitsubishi Electric FR-A8NP Instruction Manual

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
LED on
panel display
FR-A8NP
on the inverter
0.00 OFF
88
TROUBLESHOOTING
Possible cause
The option unit is not mounted
properly.
PROFIBUS communication is not
established with the master.
(Incorrect node address setting)
PROFIBUS communication is not
The option
established with the master.
unit is not
(Incorrect GSD file has been
operating.
registered.)
PROFIBUS communication is not
established with the master.
(Incorrect wiring)
—
The network cables are not
connected correctly.
The network
The PROFIBUS communication is
is unstable.
not established with the master.
(Unstable bus line)
Checkpoint / troubleshooting
Check if the option unit is mounted properly.
Set the same node address with the master on the
inverter (FR-A8NP) using the node address switches.
(Turn OFF, then ON the power supply after changing the
node address setting on the inverter (FR-A8NP).)
Register the correct GSD file with a configuration
software, and set the network configuration to the
master.
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.
Check if the network cables are connected properly
between the nodes.
Connect a terminating resistor. If a terminating resistor
has been already connected, check if it is connected
properly.