7-8
Fault
display
Probable cause and remedyFault 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 ac-
cording to the method set
in n04.
•A sequence error has occurred.
→ Check and adjust the local or remote
selection sequence.
Maintenance Operations Chapter
7
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