7-4
Motor Overheating Fault
The Inverter will stop according to the
setting of L1-04.
The motor has overheated.
Check the size of the load and the
length of the acceleration, deceler-
ation, and cycle times.
Check the V/f characteristics.
Check the motor temperature
input at terminal A2.
Motor Overload
The motor overload protection func-
tion has operated based on the internal
electronic thermal value.
The load is too heavy. The accelera-
tion time, deceleration time, and cycle
time are too short.
Check the size of the load and the
length of the acceleration, deceler-
ation, and cycle times.
The V/f characteristics voltage is too
high or too low.
Check the V/f characteristics.
The Motor Rated Current (E2-01) is
incorrect.
Check the Motor Rated Current
Setting (E2-01).
Inverter Overload
The Inverter overload protection func-
tion has operated based on the internal
electronic thermal value.
The load is too heavy. The accelera-
tion time, deceleration time and cycle
time are too short.
Check the size of the load and the
length of the acceleration, deceler-
ation, and cycle times.
The V/f characteristics voltage is too
high or too low.
Check the V/f characteristics.
The Inverter capacity is too low.
Replace the Inverter with one that
has a larger capacity.
Overtorque Detected 1
There has been a torque higher than
the setting in L6-02 for longer than the
time in L6-03.
–
• Make sure that the settings in
L6-02 and L6-03 are appropri-
ate.
• Check the mechanical system
and correct the cause of the
overtorque.
High-slip Braking OL
The output frequency did not change
for longer than the time set in N3-04.
The inertia of the connected machine
is too large.
Make sure the load is an inertial
load.
Undertorque Detected 1
There has been a torque lower than the
setting in L6-02 for longer than the
time in L6-03.
–
• Make sure that the settings in
L6-02 and L6-03 are appropri-
ate.
• Check the mechanical system
and correct the cause of the
undertorque.
PI Feedback Lost
A PI feedback loss detection is
enabled (b5-12 ≠ 0) and the PI feed-
back input was less than b5-13 (PI
feedback loss detection level) for
longer than the time set in b5-14 (PI
feedback loss detection time).
–
• Check the PI feedback signal
source for correct operation.
• Check the wiring.
External fault input from Communi-
cations Option Card
–
Check the Communications
Option Card and communications
signals.
Table 7.1 Fault Displays and Processing (Continued)
Display Meaning Probable Causes Corrective Actions
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