8 Fault Diagnosis
199
Flashing
Detected as
an alarm
only. Fault
contact out-
put is not ac-
tivated.
OH8 (Motor Overheat-
ing)
The motor temperature PTC
thermistor input exceeded the
alarm detection level.
• Check the size of the load
and the length of the
acceleration, decelera-
tion, and cycle times.
• Check the V/f characteris-
tics.
• Check the input motor
temperature.
(Flash-
ing)
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
OMRON representa-
tive.)
Check the setting values.
Alarm Display Inverter
Status
Description Causes and
Corrective Actions
Digital
Operator
RUN (Green)
ALARM (Red)
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