8-5
Fault Display Probable causes and remediesMeaning
OL3
Overtorque Det 1
There has been a current
greater than the setting in
L6-02 for longer than the
setting in L6-03.
→ Make
sure
that the settings in L6-02 and L6-03
are appropriate.
→ Check the mechanical system and correct the
cause of the overtorque.
OL4
Overtorque Det 2
There has been a current
greater than the setting in
L6-05 for longer than the
setting in L6-06.
→ Make
sure that the current setting in L6-05 and
time setting in L6-06 are appropriate.
→ Check the mechanical system and correct the
cause of the overtorque.
OS
Over speed
The speed has been greater
than the setting in F1-08 for
longer than the setting in
F1-09.
• Overshooting/Undershooting are occurring.
→ Adjust the gain again.
• The reference speed is too high.
→ Check
the
reference circuit and reference gain.
• The
settings in F1-08 and F1-09 aren’t
appropriate.
→ Check the settings in F1-08 and F1-09.
PGO
PG open
The PG is disconnected.
The Inverter is outputting a
frequency, but PG pulses aren’t
being input.
• The is a break in the PG wiring.
→ Fix the broken/disconnected wiring.
• The PG is wired incorrectly.
→ Fix the wiring.
• Power isn’t being supplied to the PG.
→ Supply power to the PG properly.
• The torque limit is set to 0 through CompoBus/D
communications. (Applies only to flux vector con-
trol.)
→ Set F9-05 to 0 (torque limit disabled).
DEV
Speed Deviation
The speed deviation has been
greater than the setting in
F1-10 for longer than the
setting in F1-11.
• The load is too large.
→ Lighten the load.
• The acceleration time and deceleration time are
too short.
→ Lengthen the acceleration time and decelera-
tion time.
• The load is locked.
→ Check the mechanical system.
• The
settings in F1-10 and
F1-1
1 aren’t appropriate.
→ Check the settings in F1-10 and F1-11.
• The torque limit is set to 0 through CompoBus/D
communications. (Applies only to flux vector con-
trol.)
→ Set F9-05 to 0 (torque limit disabled).
Maintenance Operations Chapter
8
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