5-2
Faults which can be recovered manually and automatically
Display Content Cause Corrective action
OC-A
Over-current at
acceleration
‧ Acceleration time too short
‧ The capacity of the motor
exceeds the capacity of the
inverter
‧ Short circuit between the
motor coil and the case
‧ Short circuit between motor
wiring and ground
‧ IGBT module damaged
‧ Set a longer acceleration time
‧ Replace inverter with one that
has the same rating as that of
the motor
‧ Check the motor
‧ Check the wiring
‧ Consult with the supplier
OC-C
Over-current at
fixed speed
‧ Transient load change
‧ Transient power change
‧ Increase the capacity of the
inverter
‧ Install inductor on the power
supply input side
OC-d
Over-current at
deceleration
The preset deceleration time is
too short.
Set a longer deceleration time
OC-S
Over current at
start
‧ Short circuit between the
motor coil and the case
‧ Short circuit between motor
coil and ground
‧ IGBT module damaged
‧ Inspect the motor
‧ Inspect the wiring
‧ Consult with the supplier
OV-C
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 (For 400V
models or 200V 5hp~15hp
models)
‧ Consider use of a reactor at the
power input side
PF
Input phase Loss
Abnormal fluctuations in the
main circuit voltage
‧ Check the main circuit power
supply wiring.
‧ Check the power supply voltage
LPBFT
Low pressure
fault
Since feedback value of pump
pressure is lower than limit of
minimum flow.
‧ Check feedback signal is
correct and with connection.
‧ Check if feedback value of
pressure is lower than limit of
minimum pressure (14-15).
OPBFT
High pressure
fault
Since feedback value of pump
pressure is lower than limit of
maximum flow.
‧ Check feedback signal is
correct.
‧ Check if feedback value of
pressure is lower than limit of
maximum pressure (14-12).
FBLSS
PID Feedback
Signal Loss
Since proportion of loss pressure
(14-19) is enabled and over high, the
inverter trips to fault. Thus, feedback
sensor cannot operate properly or is
not installed correctly
‧ Check if the proportion of loss
pressure (14-19) is set correctly
‧ Make sure the feedback sensor
is installed correctly and PID
feedback signal operates
normally.
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