LS Electric iS7 Drive

LS Electric iS7 Drive Fault Codes:

Fault Code and Meaning	Cause and Remedy
Over Load Warning Message	Cause: Motor is overloaded (Operates when PRT-17 is set to “1”). Remedy: Select “4 (Over Load)” to operate. Set the digital output terminal or relay (OUT31-33) to “4 (Over Load)” to receive overload warning output signals.
Under Load Warning Message	Cause: Motor is underloaded (Operates when PRT-25 is set to “1”). Remedy: Set the digital output terminal or relay (OUT31-33) to “6 (Under Load)” to receive underload warning output signals.
Inv Over Load Warning Message	Cause: Accumulated overload time is equivalent to 60% of the inverter overheat protection (inverter IOLT) level. Remedy: Set the digital output terminal or relay (OUT31-33) to “5 (IOL)” to receive inverter overload warning output signals.
Lost Command Warning Message	Cause: Lost Command warning alarm occurred based on condition set at PRT-13-15 (occurs even when PRT-12 is “0”). Remedy: Set the digital output terminal or relay (OUT31-33) to “12 (Lost Command)” to receive lost command warning output signals.
Fan Warning Warning Message	Cause: Error detected from the cooling fan while PRT-79 is set to “1”. Remedy: Set the digital output terminal or relay (OUT31-33) to “8 (Fan Warning)” to receive fan warning output signals.
DB Warn %ED Warning Message	Cause: DB resistor usage rate exceeds the set value. Remedy: Set the detection level at PRT-66.
Enc Conn Check Warning Message	Cause: “3 (Enc Test)” is set at BAS-20 (Auto Tuning) and no signal is input during the encoder test. Remedy: Set the ENC Tune at OUT31–33 to release a signal.
Enc Dir Check Warning Message	Cause: “3 (Enc Test)” is set at BAS-20 and settings for A and B encoder phases are changed or opposite during test. Remedy: Set the ENC Dir at OUT31-33 to release a signal.
Lost Keypad Warning Message	Cause: Operating commands come from keypad or communication problem in Keypad JOG mode after setting PRT-11 to “0”. Remedy: Set the Lost Keypad (29) at OUT31-33.
Check Line PLZ Warning Message	Cause: Problem with communication between the keypad and the iS7 Control CPU (control connection cables). Remedy: Check control connection cables.
Fire Mode Warning Message	Cause: Fire function is activated. Remedy: If a contact signal output is required, set the Fire Mode (37) at OUT31-33.
PID Sleep Warning Message	Cause: Displayed in PID Sleep mode to distinguish from a stopped state. Remedy: Information only (Warning status).
AUX Power On Warning Message	Cause: Control power is supplied with the auxiliary power module (replaces Low Voltage trip when main power is off). Remedy: Information only.
Over Load Fault Trip	Cause: The load is greater than the motor’s rated capacity. Remedy: Ensure that the motor and inverter have appropriate capacity ratings. Cause: The set value for the overload trip level (PRT-21) is too low. Remedy: Increase the set value for the overload trip level.
Under Load Fault Trip	Cause: There is a motor-load connection problem. Remedy: Replace the motor and inverter with lower capacity models. Cause: The set value for the underload level (PRT-29 and PRT-30) is less than the system’s minimum load. Remedy: Increase the set value for the underload level.
Over Current1 Fault Trip	Cause: Acc/dec time is too short compared to load inertia (GD2). Remedy: Increase acc/dec time. Cause: The inverter load is greater than the rated capacity. Remedy: Replace the inverter with a model that has increased capacity. Cause: The inverter supplied an output while the motor was idling. Remedy: Operate the inverter after the motor has stopped or use the speed search function (CON-60). Cause: The mechanical brake of the motor is operating too fast. Remedy: Check the mechanical brake.
Over Voltage Fault Trip	Cause: The deceleration time is too short for the load inertia (GD2). Remedy: Increase the deceleration time. Cause: A generative load occurs at the inverter output. Remedy: Use the braking unit. Cause: The input voltage is too high. Remedy: Check if the input voltage is above the specified value.
Low Voltage / Low Voltage2 Fault Trip	Cause: The input voltage is too low. Remedy: Check if the input voltage is below the specified value. Cause: A load greater than the power capacity is connected to the system (e.g. a welder, direct motor connection). Remedy: Increase the power capacity. Cause: The magnetic contactor connected to the power source has a faulty connection. Remedy: Replace the magnetic contactor.
Ground Trip Fault Trip	Cause: A ground fault has occurred in the inverter output wiring. Remedy: Check the output wiring.
E-Thermal Fault Trip	Cause: The set value for electronic thermal protection is too low. Remedy: Set an appropriate electronic thermal level. Cause: The inverter has been operated at a low speed for an extended period. Remedy: Replace the motor with a model that supplies extra power to the cooling fan. Cause: The motor insulation is damaged. Remedy: Replace the motor. Cause: The motor has overheated. Remedy: Reduce the load or operation frequency. Cause: The inverter load is greater than the rated capacity. Remedy: Replace the inverter with a model that has increased capacity.
Out Phase Open Fault Trip	Cause: The magnetic contactor on the output side has a connection fault. Remedy: Check the magnetic contactor on the output side. Cause: The output wiring is faulty. Remedy: Check the output wiring.
In Phase Open Fault Trip	Cause: The magnetic contactor on the input side has a connection fault. Remedy: Check the magnetic contactor on the input side. Cause: The input wiring is faulty. Remedy: Check the input wiring. Cause: The DC link capacitor needs to be replaced. Remedy: Replace the DC link capacitor. Contact the retailer or LS ELECTRIC Customer Support.
Inverter OLT Fault Trip	Cause: The load is greater than the rated motor capacity. Remedy: Replace the motor and inverter with models that have increased capacity. Cause: The torque boost level is too high. Remedy: Reduce the torque boost level.
Over Heat Fault Trip	Cause: There is a problem with the cooling system. Remedy: Check if a foreign object is obstructing the air inlet, outlet, or vent. Cause: The inverter cooling fan has been operating for an extended period. Remedy: Replace the cooling fan. Cause: The ambient temperature is too high. Remedy: Keep the ambient temperature below 50°C.
Over Current2 Fault Trip	Cause: The output wiring has short-circuited. Remedy: Check the output wiring. Cause: There is a fault with the electronic semiconductor (IGBT). Remedy: Do not operate the inverter. Contact the retailer or LS ELECTRIC Customer Support.
NTC Open Fault Trip	Cause: The ambient temperature is too low. Remedy: Keep the ambient temperature above 10°C. Cause: There is a fault with the internal temperature sensor. Remedy: Contact the retailer or LS ELECTRIC Customer Support.
FAN Trip Fault Trip	Cause: There is a foreign object in the inverter vent where the fan is located. Remedy: Remove the foreign object from the air inlet or outlet. Cause: The cooling fan needs to be replaced. Remedy: Replace the cooling fan.
IP54 FAN Trip Fault Trip	Cause: The fan connector is not connected. Remedy: Connect the fan connector. Cause: The power connector for the internal fan PCB board is not connected. Remedy: Connect the power connector for the internal fan PCB board. Cause: The cooling fan needs to be replaced. Remedy: Replace the cooling fan.
No Motor Trip Fault Trip	Cause: The motor is not connected to the inverter output. Remedy: Check the wiring connections. Cause: The current level for trip detection is not set properly. Remedy: Check the values of both BAS-13 (Rated current) and PRT-32 (No Motor Level).