10-3
LED display
Description
Cause
Possible solutions
Input phase
loss
Phase loss at the input side of
the inverter or input voltage
imbalance, active when 08-09
= 1 (enabled).
Loose wire at inverter input terminal.
Momentary power loss.
Input voltage imbalance.
Check input wiring.
Fasten wire terminal
screws.
Check power supply.
Output phase
loss
Phase loss at the output side
of the inverter, active when
08-10 = 1 (enabled).
Wiring loose at inverter output
terminal.
Motor rated current is less than 10%
of the inverter rated current.
Check output wiring / fasten
screws.
Check motor & inverter
rating.
OH1
Heatsink
overheat
The temperature of the heat
sink is too high.
Note: when OH1 fault occurs
three times within five
minutes, requires to wait 10
minutes before the inverter
can be reset.
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
OH4
Motor
overheating
Motor overheating, PTC
(Positive Temperature
Coefficient) exceeds the
overheat protection level.
The surrounding temperature of the
motor is too high.
The PTC input (Positive
Temperature Coefficient) exceeds
the overheat protection level.
Check the surrounding
Temperature of the motor.
Check the MT and GND
terminal wiring.
OL1
Motor
overload
Internal motor overload
protection tripped, active
when protection curve 08-05
= xxx1.
Voltage setting in V/F mode set too
high, resulting in over-excitation of
the motor.
Motor rated current (02-01) set
incorrectly.
Load too heavy.
Check V/f curve.
Check motor rated
current
Check and reduce motor
load, check application
operation duty cycle.
OL2
Inverter
overload
Inverter thermal overload
protection tripped.
If an inverter overload occurs
4 times in five minutes,
requires to wait 4 minutes
before the inverter can be
reset.
Voltage setting in V/F mode set too
high, resulting in over-excitation of
the motor.
Inverter rating to small.
Load too heavy.
Check V/f curve.
Replace inverter with larger
size inverter.
Check and reduce motor
load, check application
operation duty cycle.