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5-3
overcurrent level
(200% of the
inverter rated
current).
greater than the inverter rated value.
Short circuit or ground fault.
Disconnect motor and try
running inverter.
OC-C
over current at
fixed speed
The inverter output
current exceeds the
overcurrent level
(200% of the
inverter rated
current).
Acceleration / Deceleration time is too short.
Contactor at the inverter output side.
A special motor or applicable capacity is
greater than the inverter rated value.
Short circuit or ground fault.
Extend acceleration /
deceleration time.
Check the motor wiring.
Disconnect motor and try
running inverter.
OC-d
over current at
deceleration
The inverter output
current exceeds the
overcurrent level
(200% of the
inverter rated
current).
Acceleration / Deceleration time is too short.
Contactor at the inverter output side.
A special motor or applicable capacity is
greater than the inverter rated value.
Short circuit or ground fault.
Extend acceleration /
deceleration time.
Check the motor wiring.
Disconnect motor and try
running inverter.
OC-S
over current at
start
The inverter output
current exceeds the
overcurrent level
(200% of the
inverter rated
current).
Acceleration / Deceleration time is too short.
Contactor at the inverter output side.
A special motor or applicable capacity is
greater than the inverter rated value.
Short circuit or ground fault.
Extend acceleration /
deceleration time.
Check the motor wiring.
Disconnect motor and try
running inverter.
OV-C
over voltage
during operation
/ deceleration
Excessive Voltage
during operation/
deceleration
Deceleration time setting too short or
excessive load inertia
Power voltage varies widely (fluctuates)
Set a longer deceleration
time
Consider use of a brake resistor
and/or brake module (in case of
400V models)
Consider use of a reactor at the
power input side
PF
input phase loss
Input phase Loss
Abnormal fluctuations in the main circuit
voltage
Check the main circuit power
supply wiring.
Check the power supply voltage
OC
over current
The inverter output
current exceeds the
overcurrent level
(200% of the
inverter rated
current).
Acceleration / Deceleration time is too short.
Contactor at the inverter output side.
A special motor or applicable capacity is
greater than the inverter rated value.
Short circuit or ground fault.
Extend acceleration /
deceleration time.
Check the motor wiring.
Disconnect motor and try
running inverter.
OL1
Motor overload
Internal motor
overload protection
tripped, active when
protection curve
08-05 = xxx1.
Voltage setting V/F mode too high, resulting in
over-excitation of the motor.
Motor rated current (02-01) set incorrectly.
Load too heavy.
Check V/f curve.
Check motor rated current
Check and reduce motor load,
check and operation duty cycle.
OL2
Motor overload
Internal motor
overload protection
tripped, active when
protection curve
08-05 = xxx1.
Voltage setting V/F mode too high, resulting in
over-excitation of the motor.
Motor rated current (02-01) set incorrectly.
Load too heavy.
Check V/f curve.
Check motor rated current
Check and reduce motor load,
check and operation duty cycle.