Protective and Diagnostic Functions
32
Fault display Probable cause and remedyWarning name and Meaning
ser
(flashing)
Sequence error (SER)
A sequence change has been input
while the Inverter is in operation.
Local or remote selection is input while
the Inverter is in operation.
Note The Inverter coasts to a stop.
• A sequence error has occurred.
→ Check and adjust the local or remote selection sequence as multi-function input.
bb
(flashing)
External base block (bb)
The external base block command has
been input.
Note The Inverter coasts to a stop.
• The external base block command has been input as multi-function input.
→ Remove the cause of external base block input.
• The sequence is incorrect.
→ Check and change the external fault input sequence including the input timing and NO or NC
contact.
ef
(flashing)
Forward- and reverse-rotation input
(EF)
The forward and reverse commands
are input to the control circuit terminals
simultaneously for 0.5 s or more.
Note The Inverter stops according
to the method set in n04.
• A sequence error has occurred.
→ Check and adjust the local or remote selection sequence.
(flashing)
Emergency stop (STP)
The Digital Operator stops operating.
The STOP/RESET Key on the Digital
Operator is pressed while the Inverter
is operating according to the forward or
reverse command through the control
circuit terminals.
Note The Inverter stops according
to the method set in n04.
• The parameter setting was incorrect.
→ Turn off the forward or reverse command once, check that the n06 parameter setting for
STOP/RESET Key function selection, and restart the Inverter.
The emergency stop alarm signal is
input as multi-function input.
A multi-function input 1, 2, 3, or 4 set to
20 or 22 has been used.
Note The Inverter stops according
to the method set in n04.
• An emergency stop alarm is input to a multi-function input.
→ Remove the cause of the fault.
• The sequence is incorrect.
→ Check and change the external fault input sequence including the input timing and NO or NC
contact.
fRn
(flashing)
Cooling fan fault (FAN)
The cooling fan has been locked.
• The cooling fan wiring has a fault.
→ Turn off the Inverter, dismount the fan, and check and repair the wiring.
• The cooling fan in not in good condition.
→ Check and remove the foreign material or dust on the fan.
• The cooling fan is beyond repair.
→ Replace the fan.
ce
Communications time-over (CE)
Normal RS-422A/485 communications
were not established within 2 s. The
Inverter will detect this error if n68
(RS-422A/485 communications
time-over detection selection) is set to
0, 1, or 2.
• A short-circuit, ground fault, or disconnection has occurred on the communications line.
→ Check and correct the line.
• The termination resistance setting is incorrect.
→ Set the termination resistance of only the Inverter located at each end of the network to ON.
• Noise influence.
→ Do not wire the communications line along with power lines in the same conduit.
→ Use the twisted-pair shielded wire for the communications line, and ground it at the Master.
• Master’s program error.
→ Check and correct the program so that communications will be performed more than once every
2-s period.
• Communications circuit damage.
→ If the same error is detected as a result of a self-diagnostic test, change the Inverter.
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