OLt
Over Load
(Latch Trip)
Displayed when the motor overload trip is activated and the actual load level exceeds the set level. Operates when Pr20 is set to a value other than 0.
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Cause:
- The load is greater than the motor’s rated capacity.
- The set value for the overload trip level (Pr21) is too low.
Remedy:
- Ensure that the motor and inverter have appropriate capacity ratings.
- Increase the set value for the overload trip level.
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OCt
Over Current
(Latch Trip)
Displayed when inverter output current exceeds 200% of the rated current.
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Cause:
- Acc/Dec time is too short, compared to load inertia (bA16).
- The inverter load is greater than the rated capacity.
- The inverter supplied an output while the motor was idling.
- The mechanical brake of the motor is operating too fast.
Remedy:
- Increase Acc/Dec time.
- Replace the inverter with a model that has increased capacity.
- Operate the inverter after the motor has stopped or use the speed search function (Cn71).
- Check the mechanical brake.
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Ovt
Over Voltage
(Latch Trip)
Displayed when internal DC circuit voltage exceeds the specified value.
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Cause:
- Deceleration time is too short for the load inertia (bA16).
- A generative load occurs at the inverter output.
- The input voltage is too high.
Remedy:
- Increase the acceleration time.
- Use the braking unit.
- Determine if the input voltage is above the specified value.
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Lvt
Low Voltage
(Level Trip)
Displayed when internal DC circuit voltage is less than the specified value.
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Cause:
- The input voltage is too low.
- A load greater than the power capacity is connected to the system (e.g., a welder, direct motor connection, etc.).
- The magnetic contactor connected to the power source has a faulty connection.
Remedy:
- Determine if the input voltage is below the specified value. Adjust the bA19 (Inverter input voltage) value.
- Increase the power capacity.
- Replace the magnetic contactor.
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GFt
Ground Trip
(Latch Trip)
Displayed when a ground fault trip occurs on the output side of the inverter.
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Cause:
- A ground fault has occurred in the inverter output wiring.
- The motor insulation is damaged.
Remedy:
- Check the output wiring.
- Replace the motor.
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EtH
E-Thermal
(Latch Trip)
Displayed based on inverse time-limit thermal characteristics to prevent motor overheating.
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Cause:
- The motor has overheated.
- The inverter load is greater than the rated capacity.
- The inverter has been operated at low speed for an extended duration.
Remedy:
- Reduce the load or operation frequency.
- Replace the inverter with a model that has increased capacity.
- Replace the motor with a model that supplies extra power to the cooling fan.
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OPO
Out Phase Open
(Latch Trip)
Displayed when a 3-phase inverter output has one or more phases in an open circuit condition.
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Cause:
- The magnetic contactor on the output side has a connection fault.
- The output wiring is faulty.
Remedy:
- Check the magnetic contactor on the output side.
- Check the output wiring.
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IOL
Inverter OLT
(Latch Trip)
Displayed when the inverter has been protected from overload and resultant overheating.
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Cause:
- The load is greater than the rated motor capacity.
- The torque boost level is too high.
Remedy:
- Replace the motor and inverter with models that have increased capacity.
- Reduce the torque boost level.
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OHt
Over Heat
(Latch Trip)
Displayed when the temperature of the inverter heat sink exceeds the specified value.
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Cause:
- There is a problem with the cooling system.
- The inverter cooling fan has been operated for an extended period.
- The ambient temperature is too high.
Remedy:
- Determine if a foreign object is obstructing the air inlet, outlet, or vent.
- Replace the cooling fan.
- Keep the ambient temperature below 50℃.
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ntC
NTC Open
(Latch Trip)
Displayed when an error is detected in the temperature sensor of the IGBT.
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Cause:
- The ambient temperature is too low.
- There is a fault with the internal temperature sensor.
Remedy:
- Keep the ambient temperature above -10℃.
- Contact the retailer or the LS ELECTRIC customer service center.
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FAn
Fan Trip
(Latch Trip)
Displayed when an error is detected in the cooling fan.
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Cause:
- A foreign object is obstructing the fan’s air vent.
- The cooling fan needs to be replaced.
Remedy:
- Remove the foreign object from the air inlet or outlet.
- Replace the cooling fan.
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rOt
Relay Open Trip
(Fatal Trip)
Displayed when the input power is unstable or an initial charging circuit trip occurs.
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Cause:
- The input power is unstable or an initial charging circuit trip occurs while supplying power to the inverter.
Remedy:
- Turn off and on the power again.
- If the problem continues, stop using the inverter and contact the retailer or the LS ELECTRIC customer service center.
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