5-2
Display
Content
Cause Corrective action
OC-d
Over-current at
deceleration
The preset deceleration time
is too short.
Set a longer deceleration time
OC-S
Over current at
start
1. Short circuit between the
motor coil and the case
2. Short circuit between motor
coil and ground
3. the IGBT module damaged
1.Inspect the motor
2.Inspect the wiring
3.Consult with the supplier
OV-C
Excessive
Voltage during
operation/
deceleration
1.Deceleration time setting
too short or excessive load
inertia
2.Power voltage varies widely
(fluctuates)
1.Set a longer deceleration time
2. Add a brake resistor or brake
module
3.Add a reactor at the power
input side
PF
Input phase
Loss
Abnormal fluctuations in the
main circuit voltage
1. Check the main circuit
power supply wiring.
2. Check the power supply
voltage
ud-C
Output under
current detection
Output current < Output
under current detection level
Set the level according to
application
LF
Output phase
loss
Loss of output voltage on any
of the phases
1. Check output cable
connection
2.Determine resistance between
the lines
3.Check whether the terminals
are loose
Faults which can be recovered manually but not automatically
Display Content Cause Corrective action
OC
Over-current
during stop
Detection circuit malfunction
Consult with the supplier
OL1
Motor overload loading too large
Consider increasing the Motor
capacity
OL2
Inverter overload
Excessive Load
Consider increasing the inverter
capacity
OL3
Over torque
1. Load too large
2. the setting of (8-15, 8-16)
too small
1. Increase the inverter capacity
2. Set(8-15, 8-16) as needed
LV-C
Voltage too low
during operation
1.Power voltage too low
2.Power voltage varies widely
(fluctuates)
1.Improve power quality
2.Consider adding a reactor at
the power input side
OVSP
Motor rotating
too fast
Rotation speed and the set
speed value vary widely
1.Load may be too large
2.Check if the set speed is
correct.
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