LS M100 Fault Codes List

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Troubleshoot your LS Electric M100 micro-inverter with our updated guide. Learn to interpret OCT, OVT, and LVT trips, use DriveView 9 for diagnostics, and reset faults.

M100 Fault Codes Reference Table

Below is the complete list of fault and warning codes. Please refer to your specific table to match the code on your display with the necessary corrective action.

LS M100 Fault Codes List

LS M100 Fault Codes List

Fault Code and Meaning Cause and Remedy
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. 		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.
OCt

Over Current
(Latch Trip)

Displayed when inverter output current exceeds 200% of the rated current. 		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.
Ovt

Over Voltage
(Latch Trip)

Displayed when internal DC circuit voltage exceeds the specified value. 		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.
Lvt

Low Voltage
(Level Trip)

Displayed when internal DC circuit voltage is less than the specified value. 		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.
GFt

Ground Trip
(Latch Trip)

Displayed when a ground fault trip occurs on the output side of the inverter. 		Cause:
  • A ground fault has occurred in the inverter output wiring.
  • The motor insulation is damaged.

Remedy:
  • Check the output wiring.
  • Replace the motor.
EtH

E-Thermal
(Latch Trip)

Displayed based on inverse time-limit thermal characteristics to prevent motor overheating. 		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.
OPO

Out Phase Open
(Latch Trip)

Displayed when a 3-phase inverter output has one or more phases in an open circuit condition. 		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.
IOL

Inverter OLT
(Latch Trip)

Displayed when the inverter has been protected from overload and resultant overheating. 		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.
OHt

Over Heat
(Latch Trip)

Displayed when the temperature of the inverter heat sink exceeds the specified value. 		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℃.
ntC

NTC Open
(Latch Trip)

Displayed when an error is detected in the temperature sensor of the IGBT. 		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.
FAn

Fan Trip
(Latch Trip)

Displayed when an error is detected in the cooling fan. 		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.
rOt

Relay Open Trip
(Fatal Trip)

Displayed when the input power is unstable or an initial charging circuit trip occurs. 		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.
 

How to Read M100 Faults via DriveView 9 & Smart Copier

Even though the M100 is a micro-drive, it supports advanced digital diagnostic tools for 2026 maintenance standards.

  • Fault History (PRT-10 to 14): The M100 records the last 5 trips. You can access these via the keypad in the PRT (Protection) group. It stores the frequency and current status at the time of the error.
  • DriveView 9: You can connect your PC to the M100 using the RJ45 port. This software allows you to view real-time I/O terminal status to see if an external sensor is triggering an EXT (External) trip.
  • Smart Copier: For high-volume machine builders, the Smart Copier allows you to read and write parameters and check fault logs without ever powering up the main drive, significantly speeding up field troubleshooting.

General Troubleshooting Steps

Before performing a manual reset on your M100 drive, perform these essential hardware checks:

  1. Overcurrent (OCT): This is the most common trip. Check if the “Acceleration Time” (Parameter ACC) is too short for the load. Also, ensure the motor is not jammed and that there are no phase-to-ground shorts in the wiring.
  2. Low Voltage (LVT): The M100 is highly sensitive to input power quality. Ensure your input AC voltage is stable. If LVT occurs frequently, check for loose connections on the R and T input terminals.
  3. Electronic Thermal (ETH): If the drive trips on ETH, verify that the motor’s rated current is correctly entered in parameter dr.04. If the setting is correct, the motor may be overheating due to excessive mechanical load.

Frequently Asked Questions (FAQ)

Q: What is the difference between a Trip and a Warning?

A: A Trip (e.g., OCT, OVT) instantly cuts the output power to the motor and requires a reset to restart. A Warning (flashing codes like FAN for a fan failure) notifies you of a problem but allows the drive to continue running, potentially at a limited capacity.

Q: How do I reset a fault on the LS M100?

A: Once the cause is resolved, you can reset the drive by:

  • Pressing the STOP/RESET key on the front keypad.
  • Activating the digital input programmed for RST (Reset).
  • Cycling the input power (Wait until the display goes completely blank before re-applying power).

Q: Why does my drive display “Pot”?

A: Pot is not an error code. It indicates that the drive’s frequency (speed) reference is being controlled by the built-in Potentiometer dial on the front of the unit.

Q: Where is the fault history stored?

A: You can find the history of the last 5 faults in the PRT (Protection) group, specifically parameters PRT-10 through PRT-14. Each entry provides a snapshot of the drive’s frequency and current at the time of the fault.

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