,&
Protection function Error causes Action to be taken
Low-voltage protection
(main circuit voltage in-
sufficient)
Input voltage drop Check the main circuit DC voltage in
Un-xx. If the voltage is low, adjust the
input voltage.
Overtorque detection Motor current exceeded the set value
because of machine fault or overload.
Check the driven machine and correct
the cause of the fault or set to a higher
value.
Stall pre-
vention (Ac-
cel/decel is
accom-
plished with
maximum
capacity of
During ac-
celeration
Insufficient power for accel/decel
Overload
Phase loss
Set proper accel/decel time for smooth
operation.
For stall prevention during normal op-
eration lighten the load or increase in-
verter capacity.
t
e
nverter
without trip-
ping on
overcurrent
or overvol-
tage.)
During nor-
mal opera-
tion
During de-
celeration
Simultaneous normal and
reverse rotation com-
mands
Operation sequence error
3-wire/2-wire selection error
Recheck the control sequence.
Recheck constant settings (No. 32 and
No. 33).
External base block sig-
nal input (main circuit
transistor instantaneous
shut-off)
--- ---
$
Section 2-12
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