5-2
LED
display
Description Possible causes Corrective action
UV under
voltage
Under voltage of main circuit:
DC bus voltage is lower than
the UV detection value or the
electromagnetic contactor of
DC bus is not used, and at the
same time, the inverter is
operating.
About 190Vdc: 220V class;
380Vdc: 440V class
(the detection value can be
adjusted by 07-13)
. The input voltage is too low.
. Phase loss of input power
. Acceleration time is too short.
. The input Voltage is large fluctuation.
.Electromagnetic contactor of DC bus
is not used or the feedback signal is
not unusual.
Check the input circuit and
the power voltage.
Prolong acceleration time.
IPL input
phase loss
Input phase loss:
Phase loss at the input side of
the inverter or there is an
imbalance great voltage.
When 08-09 = 1 (enabed), this
fault will be detected.
. IPL occurs.
. Terminal screws of R/L1, S/L2 or T/L3
are loose or lost.
. Instantaneous power loss occurs.
. Input voltage fluctuation is too big.
. Check the input voltage.
. Fasten terminal screws.
OPL output
phase loss
Output phase loss:
Phase loss at the output side
of the inverter.
When 08-10=1, this fault
detection function is enabled.
. The output cable or the internal of
motor is damaged.
.Terminal screws of R/ L1、S/L2 or T/
L3 are loose or lost.
. Motor rated capacity is less than 10%
of the inverter rated value.
. Check motor wiring.
. Check the motor and the
inverter capacity.
OH1
Heat sink is
overheating
Heat sink is overheating :
The temperature of the heat
sink is too high.
If heat sink overheating fault
has occurred with three times
in five minutes, it is required to
wait 10 minutes before
resetting the fault.
. Ambient temperature is too high.
. The cooling fan has stopped.
. Carrier frequency setting is too high.
. Check the ambient
temperature of the inverter.
. Check the fan or dust and dirt
in the heat sink.
. Check the carrier frequency
setting.
OL1
Motor
overload
Motor overload：
Motor overload protection
function is enabled according
to the overload protection
curve 08-05 = xxx1 of the
motor internal (motor overload
protection enabling).
.Voltage setting of V / F mode is too
high, resulting in motor
over-excitation.
.Motor rated current setitng(02-01) is
incorrect.
. Motor load is too big.
. Check the V / F mode.
. Check the motor rated current.
. Check the load and the
operation cycle time.
OL2
Over load of
the inverter
over load of the inverter:
The overload protection
function of the inverter
depends on the overload
protection curve of inverter
internal.
When the over load of the
inverter is removed, the
warning of over load of the
inverter will appear. However,
if the warning of over load of
the inverter has occurred by 4
times in five minutes, it is
required to wait 4 minutes to
reset the fault.
. Voltage setting of V / F mode is too
high.
. The inverter capacity is too small.
. Motor load is too big.
. Check the V / F mode.
. Replaced by a higher-capacity
inverter
. Check the load and the
operation cycle time.
OT
over torque
detection
Over torque detection :
Inverter output torque is higher
than 08-15 (over torque
detection level) and exceeds
set time of 08-16, then the
inverter enables the base
block (08-14 = 0).
Mechanical load is too big.
.Check the application or
operating status
.Check whether 08-15 and
08-16 are appropriate values
UT
under torque
detection
Under torque detection:
When inverter output torque is
lower than 08-19 (under
torque detection level) and
exceeds set time of 08-20,
Reduce the mechanical load suddenly.
(for example, the belt is broken)
.Check the application or
operating status
.Check whether 08-19 and
08-20 are appropriate values
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