7
-8
K
K
K
K
Alarm
Detection
Alarms
are detected as a type of Inverter protection function and do not operate the fault contact output. The
system
will automatically return to its original status once the cause of the alarm has been removed.
The
Digital Operator display flashes and the alarm is output from the multi-function outputs (H2-01 to H2-
03).
When
an alarm occurs, take appropriate countermeasures according to the table below.
Table 7.2 Alarm Displays and Processing
Display
Meaning
Probable causes
Corrective Actions
(blink-
ing)
External
Fault
Forward/Reverse Run Commands
Input Together
Both
the forward and reverse run com-
mands
have been ON for more than
0.5
s.
-
Check
the sequence of the forward and
reverse
run commands.
Since
the rotational direction is
unknown,
the motor will be deceler-
ated
to a stop when this minor fault
occurs.
(blink-
ing)
DC
Bus
Under-
volt
Main Circuit Undervoltage
The
following conditions occurred
when
there was no Run signal.
• The
main circuit DC voltage was
below
the Undervoltage Detection
Level
Setting (L2-05).
• The
surge current limiting contactor
opened.
• The
control power supply voltage
when
below the CUV level.
See
causes for UV1, UV2, and UV3
faults
in the previous table.
See
corrective actions for UV1, UV2,
and
UV3 faults in the previous table.
(blink-
ing)
DC
Bus
Overvolt
Main Circuit Overvoltage
The
main circuit DC voltage exceeded
the
overvoltage detection level.
200
V class: Approx. 400 V
400
V class: Approx. 800 V
The
power supply voltage is too high.
Decrease
the voltage so it's within
specifications.
(blink-
ing)
Heatsnk
Over-
temp
Cooling Fin Overheating
The
temperature of the Inverter's cool-
ing
fins exceeded the setting in L8-02.
The
ambient temperature is too high. Install a cooling unit.
There
is a heat source nearby.
Remove
the heat source
The
Inverter cooling fan has stopped.
Replace
the cooling fan. (Contact your
dealer.)
(blink-
ing)
Over
Heat
2
Inverter Overheating Pre-alarm
An
OH2 alarm signal (Inverter over-
heating
alarm signal) was input from a
multi-function
input terminal (S3 to
S7).
-
Clear
the multi-function input termi-
nal's
overheating alarm input.
(blink-
ing)
Motor
Over-
heat
1
Motor overheating
E
was set for H3-09 and the motor
temperature
thermistor input exceeded
the
alarm detection level.
The
motor has overheated.
Check
the size of the load and the
length
of the acceleration, decelera-
tion,
and cycle times.
Check
the V/f characteristics.
Check
the motor temperature input on
terminals
A1 and A2.
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