DC
Bus
Undervolt
Main Circuit Undervoltage
The
main
circuit
DC
voltage
is
below
the
Undervoltage
Detection
Level
(L2-05).
200
V
class:
Approx.
190
V
400
V
class:
Approx.
380
V
Main
Circuit
MC
Operation
Failure
The
MC
stopped
responding
during
Inverter
operation.
Applicable
Inverter
Capacities
200
V
class:
37
to
110
kW
400
V
class:
75
to
300
kW
•An
open-phase
occurred
with
the
input
power
supply.
•A
momentary
power
loss
occurred.
•The
wiring
terminals
for
the
input
power
supply
are
loose.
•The
voltage
fluctuations
in
the
input
power
supply
are
too
large.
•A
fault
occurred
in
the
surge
pre-
vention
circuit.
Reset
the
fault
after
correcting
its
cause.
CTL
PS
Undervolt
Control Power Fault
The
control
power
supply
voltage
dropped.
-
•Try
turning
the
power
supply
off
and
on.
• Replace
the
Inverter
if
the
fault
continues
to
occur.
MC
Answer-
back
Inrush Prevention Circuit Fault
Overheating
occurred
in
the
inrush
resistor.
The
MC
did
not
respond
for
10
s
even
though
the
MC
ON
signal
has
been
output.
Applicable
Inverter
Capacities
200
V
class:
37
to
110
kW
400
V
class:
75
to
300
kW
•The
MC
in
the
main
circuit
failed.
•The
MC
excitation
coil
is
burned
out.
•Try
turning
the
power
supply
off
and
on.
• Replace
the
Inverter
if
the
fault
continues
to
occur.
Input
Pha
Loss
Main Circuit Voltage Fault
The
main
circuit
DC
voltage
oscillates
unusually
(not
when
regenerating).
This
fault
is
detected
when
L8-05
is
set
to
“Enabled.”
•An
open-phase
occurred
in
the
input
power
supply.
•A
momentary
power
loss
occurred.
•The
wiring
terminals
for
the
input
power
supply
are
loose.
•The
voltage
fluctuations
in
the
input
power
supply
are
too
large.
•The
voltage
balance
between
phases
is
bad.
Reset
the
fault
after
correcting
its
cause.
Output
Pha
Loss
Output Open-phase
An
open-phase
occurred
at
the
Inverter
output.
This
fault
is
detected
when
L8-07
is
set
to
“Enabled.”
•There
is
a
broken
wire
in
the
output
cable.
•There
is
a
broken
wire
in
the
motor
winding.
•The
output
terminals
are
loose.
Reset
the
fault
after
correcting
its
cause.
The
motor
being
used
has
a
capacity
less
than
5%
of
the
Inverter's
maxi-
mum
motor
capacity.
Check
the
motor
and
Inverter
capacity.
Heatsnk
Overtmp
()
Heatsink
MAX
Temp
Cooling Fin Overheating
The
temperature
of
the
Inverter's
cool-
ing
fins
exceeded
the
setting
in
L8-02
or
105°C.
OH:
The
temperature
exceeded
the
setting
in
L8-02
(Stopping
method
can
be
changed
by
L8-03.).
OH1:
The
temperature
exceeded
100°C
(Stopping
method:
Coast
to
stop).
The
ambient
temperature
is
too
high. Install
a
cooling
unit.
There
is
a
heat
source
nearby. Remove
the
heat
source.
The
Inverter's
cooling
fan
has
stopped.
Replace
the
cooling
fan.
(Contact
our
sales
representative.)
Inverter's Cooling Fan Stopped The
Inverter's
cooling
fan
has
stopped.
Table 7.1 Fault Displays and Processing (Continued)
Display Meaning Probable Causes Corrective Actions
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