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8
TROUBLESHOOTING
If a fault occurs and the inverter fails to operate properly, locate the cause of the fault and take proper
corrective action by referring to the troubleshooting below. If the corresponding information is not found in
the table, the inverter has problem, or the component parts are damaged, contact your sales
representative.
Display
Operation
LED of FR-
panel of
A7ND
inverter
E.OP1
Flickering Red
0.00
Off
0.00
Lit Red
Possible Causes
Connection time-out
Master did not send messages
within time limit (4 × EPR).
1. No good contact between
inverter and FR-A7ND
2. Network power is off.
3. No other node is on the
network.
1. Duplicate node address
2. Network cable offline
Check Point
1. Master sends messages
within time limit.
2. Check for a break in the
cable and a disconnected
connector.
1. FR-A7ND is plugged firmly. Plug in FR-A7ND.
2. Network power is on.
3. Other nodes are on the
network.
1. No duplicate node address After checking
2. Check that all cables are
connected properly.
Corrective Action
1. Shorten the send
time interval of
master.
2. Check for a cable
and connector.
(Refer to page 6.)
After checking
required items at left
box, reset the
inverter and restart
the network.
required items at left
box, reset the
inverter and restart
the network.
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8
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