Alarm Detection

Alarms are detected as a type of Inverter protection function that does not operate the fault contact output. The system will automatically return to its original status once the cause of the alarm has been removed.

E F (blinking) – Forward/Reverse Run Commands Input Together
Condition: Both the forward and reverse run commands have been ON for more than 0.5 seconds.
Solution: Check the sequence of the forward and reverse run commands. Since the rotational direction is unknown, the motor will be decelerated to a stop when this minor fault occurs.

o u (blinking) – Main Circuit Undervoltage
Condition: The main circuit DC voltage is below the Undervoltage Detection Level.
Solution: Refer to the causes and corrective actions for UV1, UV2, and UV3 faults in the previous table.

o u (blinking) – Main Circuit Overvoltage
Condition: The main circuit DC voltage exceeded the overvoltage detection level.
Solution: If the power supply voltage is too high, decrease it to within specifications.

o H (blinking) – Cooling Fin Overheating
Condition: The temperature of the Inverter’s cooling fin exceeded the set level.
Solution: If the ambient temperature is too high, install a cooling unit, remove the heat source, or replace the cooling fan if it has stopped.

o H 2 (blinking) – Inverter Overheating Pre-alarm
Condition: An OH2 alarm signal was input from a multi-function input terminal.
Solution: No specific solution is provided for this condition.

o H 3 (blinking) – Motor Overheating
Condition: The motor has overheated.
Solution: Check the size of the load and the length of the acceleration, deceleration, and cycle times.

o L 3 (blinking) – Overtorque 1
Condition: The current exceeded the setting in L6-02 for longer than the set time in L6-03.
Solution: Check the mechanical system and correct the cause of the overtorque.

E F O – External Error Detected
Condition: An external error was detected for a Communications Card other than SI-K2.
Solution: Remove the cause of the external fault.

F b L (blinking) – PI Feedback Reference Lost
Condition: A PI feedback reference loss was detected.
Solution: No specific solution is provided for this condition.

C E (blinking) – RS-422A/485 Communications Error
Condition: Normal reception was not possible for 2 seconds or longer after control data was received.
Solution: Check the communications devices and signals.

b U S (blinking) – Option Card Communication Error
Condition: A communication error occurred during a run command or while setting a frequency reference from an Option Card.
Solution: Check the communications devices and signals.

C R I L (blinking) – Communications on Standby
Condition: Control data was not normally received when power was turned ON.
Solution: Check the communications devices and signals.