5-2
LED display
Description
Cause
Possible solutions
LV
Under voltage
DC bus voltage is
lower than the UV
detection level or
the pre-charge
contactor is not
active while the
inverter is running.
190Vdc: 230V
class;
380Vdc: 460V
class;
The detection value
can be adjusted by
07-13).
The input voltage is too low.
Input phase loss.
Acceleration time set too short.
Input voltage fluctuation.
Pre-charge contactor damaged.
DC bus voltage feedback signal value not
incorrect.
Check the input voltage.
Check input wiring.
Increase acceleration time.
Check power source
Replace pre-charge contactor
Replace control board or
complete inverter.
OH
Heatsink
overheat
The temperature of
the heat sink is too
high.
Note: when OH
fault occurs three
times within five
minutes, it is
required to wait 10
minutes before
resetting the fault.
Ambient temperature too high.
cooling fan failed
Carrier frequency set too high.
Load too heavy.
Install fan or AC to cool
surroundings.
Replace cooling fan.
Reduce carrier frequency.
Reduce load / Measure output
current
OH
Heatsink
overheat
The temperature of
the heat sink is too
high.
Note: when OH
fault occurs three
times within five
minutes, it is
required to wait 10
minutes before
resetting the fault.
Ambient temperature too high.
cooling fan failed
Carrier frequency set too high.
Load too heavy.
Install fan or AC to cool
surroundings.
Replace cooling fan.
Reduce carrier frequency.
Reduce load / Measure output
current
CT Fault
Input voltage fault
Abnormal input voltage, too much noise or
malfunctioning control board.
Check input voltage signal and
the voltage on the control
board.
HPErr
Inverter capacity
setting error:
Inverter capacity
13-00 does not
match the rated
voltage
The inverter capacity setting (13-00) does
not match the hardware voltage levels
Check inverter capacity setting
(13-00) to meet the hardware
voltage levels.
Err4
CPU unusual
interrupt
External noise interference
Remove interference source
then restart drive by switching
power OFF/ON.
If not resolved contact supplier.
OC-A
over current at
acceleration
The inverter output
current exceeds the
Acceleration / Deceleration time is too short.
Contactor at the inverter output side.
A special motor or applicable capacity is
Extend acceleration /
deceleration time.
Check the motor wiring.