Event code Event name Description Assumed cause
Level
Reference
Min Obs Info
087C0000 hex Overvoltage
Protection
(During Ac-
celeration)
Overvoltage occurred
during acceleration.
(1) The inverter’s power sup-
ply voltage exceeds the speci-
fied range.
√
page
A-229
(2) A surge current occurred
the input power supply.
(3) The deceleration time is
short for the load’s moment of
inertia.
(4) The acceleration time is
short.
(5) The braking load is large.
(6) There is a ground fault on
the output side.
(7) A malfunction occurred due
to noise.
087D0000 hex Overvoltage
Protection
(During De-
celeration)
Overvoltage occurred
during deceleration.
(1) The inverter’s power sup-
ply voltage exceeds the speci-
fied range.
√
page
A-232
(2) A surge current occurred
the input power supply
.
(3) The deceleration time is
short for the load’s moment of
inertia.
(4) The acceleration time is
short.
(5) The braking load is large.
(6) There is a ground fault on
the output side.
(7) A malfunction occurred due
to noise.
087E0000 hex
Overvoltage
Protection
(During Con-
stant Speed)
Overvoltage occurred
during constant
speed.
(1) The inverter’s power sup-
ply voltage exceeds the speci-
fied range.
√
page
A-235
(2) A surge current occurred
the input power supply
.
(3) The deceleration time is
short for the load’s moment of
inertia.
(4) The acceleration time is
short.
(5) The braking load is large.
(6) There is a ground fault on
the output side.
(7) A malfunction occurred due
to noise.
Appendices
A-208
M1 Series EtherCAT Type User’s Manual (I670)
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