HV350 Mini Frequency Inverter User Manual
102
Failur
e No
Failure
code
Failure description
Potential causes
Solutions
Power level of inverter is small
Replace to inverter with proper
model
3
oc3
Over current
protection when
operation with
constant speed
Sudden change of load during
operation
Decrease load’s abrupt frequency
change and amplitude
Improper
setting
of
motor
parameters
Set motor parameters properly
Power level of inverter is small
Replace to inverter with proper
model
10
ou1
Over voltage
protection when
acceleration
operation
Motor short to ground
Check motor wiring
Abnormal input power supply voltage
Check input power supply
Fast start-up again when motor
operates with high speed
Start again after the motor stop
rotating
11
ou2
Over voltage
protection when
deceleration
operation
Motor short to ground
Check motor wiring
Rotating inertial of load is too large
Choose
appropriate
energy
braking components
Deceleration time is too short
Lengthen deceleration time
12
ou3
Over voltage
protection when
operation with
constant speed
Motor short to ground
Check motor wiring
Abnormal input power supply
Check input power supply
16
LU
Power under voltage
The power voltage is lower than the
minimum operating voltage of the
equipment
Check input power supply
The internal power source of the
inverter is abnormal
Seek for technical support
17
oH1
Heatsink 1 over
temperature
protection
Ambient over-temperature
Lower the ambient temperature
and strengthen ventilation and
radiation.
Blockage of air duct
Clean the dusts, wools and other
foreign objects in the air duct.
Fan failure
Check whether fan wirings are
well connected.
Replace a new fan of the same
model.
Inverter module failure
Seek for technical support
Temperature detection circuit failure
Seek for technical support
18
oL1
Inverter overload
protection
Input power under voltage
Check input power supply
Fast start-up when motor operates
with high speed
Start again after the motor stop
rotating
Keep overloading for a long period of
time
Shorten the overloading time and
reduce load
Acceleration and deceleration time is
too short
Prolong
the
acceleration/deceleration time
V/F curve ratio is set too large
Adjust V/F curve setting and
torque boost
Power level of inverter is small
Replace to inverter with proper
model
19
oL2
Motor overload
Input power under voltage
Check input power supply