8. Fault Diagnosis
167
(Flash-
ing)
Detected as
an alarm
only. Fault
contact out-
put is not ac-
tivated.
OP (Constant setting
error when constants
are set through MEMO-
BUS communications)
OP1: Two or more values
are set for multi-func-
tion input selection.
(constants n050 to
n056)
OP2: Relationship among V/f
constants is not cor-
rect. (constants n011,
n013, n014, n016)
OP3: Setting value of motor
rated current exceeds
150% of Inverter Rated
Current. (constant
n036)
OP4: Upper/lower limit of fre-
quency reference is re-
versed. (constants
n033, n034)
OP5: Relationship among
jump frequency 1, 2
and 3 is not correct.
(constants n083 to
n085)
OP6: Multi-function Analog
Inputs (n077) and PID
Control Selection
(n128) are both set to a
value other than 0.
OP9: The setting of the In-
verter capacity does
not coincide with the
Inverter. (Contact your
Yaskawa representa-
tive.)
Check the setting values.
Flashing
OL3 (Overtorque detec-
tion)
Motor current exceeded the
preset value in constant
n098.
Overtorque detection level
was exceeded because of in-
creased leak current due to
excessively long wiring.
• Reduce the load, and
increase the acceleration/
deceleration time.
• Refer to the paragraph of
Reducing Motor Noise
or Leakage Current Using
Carrier Frequency Selec-
tion (n080) on page 83.
• Check the wiring
(increase of current
caused by rare shortcir-
cuit, etc.).
Flashing
SER (Sequence error)
Inverter received LOCAL/RE-
MOTE command or commu-
nications/control circuit termi-
nal changing signals from the
multi-function terminal while
the Inverter output is ON.
Check the following:
• NO/NC contact selection
(constant).
• Wiring is made properly.
• Signal is not input from
the PLC.
Alarm Display Inverter
Status
Description Causes and
Corrective Actions
Digital
Operator
RUN (Green)
ALARM (Red)
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