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Fault Code Symptom/Type Fault Cause Solution
E.OC1 Accelerating over-current shutdown Acceleration operation When the output current of the inverter reaches or exceeds approximately 200(%) of the rated current Protection Protection circuit operation stops Inverter output Extended acceleration time
E.OC2 Over Current Break at Constant Speed ​​In constant speed operation when the inverter output current reaches or exceeds approximately 200(%) of the rated current Protection Relay Operation Stops Inverter Output Cancels Rapid Change in Load
E.OC3 Overcurrent cut-off during deceleration When the output current of the inverter reaches or exceeds approximately 200(%) of the rated current during deceleration, the overcurrent cuts off. Inverter protection stops the inverter output. Extends the deceleration time to check the braking action.
E.OV1 Regenerative overvoltage cut-out During regeneration, the main circuit DC voltage inside the inverter exceeds the specified value due to regenerative energy protection. Protection circuit operation stops. The surge voltage generated in the inverter output power supply system may also cause movement. Shorten acceleration time
E.OV2 Regenerative Overvoltage Disconnect at Constant Speed ​​The main circuit DC voltage inside the inverter exceeds the specified value due to regenerative energy protection. Protection circuit operation stops The surge voltage generated in the inverter output power system may also cause the operation to cancel the rapid change of the load.
Please use brake unit or increase power factor converter FR-HC as needed
E.OV3 Regenerative overvoltage cut-off during deceleration stop The inverter's internal main circuit DC voltage exceeds the specified value due to regenerative energy. Protection circuit operation stops. Inrush current generated in the inverter output power supply system may also cause an increase in deceleration time. Deceleration time Load-compliant moment of inertia
Reduce braking frequency
Please use brake unit or increase power factor converter FR-HC as needed
E.THM Motor overload circuit breaker (electronic over-current protection) (Note 1) Stop the inverter output multi-pole motor when the built-in electronic over-current protection of the inverter detects that the motor is overheated due to reduced cooling capacity due to overload or constant speed operation. When installing two or more motors, install a thermal relay on the output side of the inverter to reduce the load.
Set Pr. 71 as constant torque motor when setting the torque motor
E.THT Inverter overload circuit breaker (electronic overcurrent protection) (Note 1) If the current exceeds 150 (%) of the rated current and no current interruption (200 (%) or less) occurs, the inverse timing characteristic for protecting the output transistor is enabled. Electronic overcurrent protection action stops the inverter output to lighten the load
E.FIN Overheating of the heat sink If the heat sink overheats the temperature sensor, the inverter stops outputting. The ambient temperature is adjusted within the specified range.
E.BE Brake Transistor Alarm The brake transistor has abnormality due to excessive regeneration energy returned from the motor. The abnormality of the brake transistor is detected. In this case, the inverter power supply must be turned off immediately. Is the frequency of use of the brake suitable?
E.GF Output side grounding overcurrent protection When the inverter starts, the load on the output side of the inverter generates a ground fault. When there is a leakage current on the ground, the output of the inverter is stopped.
E.OHT External thermal relay action To prevent the motor from overheating When installed in an external thermal relay or temperature relay installed inside the motor (contact open) stops the inverter output Even if the relay contact is automatically reset, the inverter cannot be restarted to reduce the load without reset. Operating frequency
E. OLT stall prevention When the stall prevention operation frequency drops to 0, the OL is displayed in the stall prevention action.
E.OPT Option Abnormal When the abnormal communication option on the built-in option function has an abnormality in communication, etc. When the inverter stops outputting the network mode If the station is in the released state, the inverter stops output Contact the dealer or the agency
E. PE parameter memory abnormality An abnormal condition occurred in the stored parameter E2PROM failure Please contact the sales outlet or the headquarters office.
E. PUE Parameter Unit Drops When the Pr. 75 is set to "2", "3", "16" or "17", the PU is disconnected and the communication between the inverter and the PU is interrupted. The output of the inverter is stopped with RS-485 Communication via the PU interface When Pr.121 "9999" occurs, the number of consecutive communication errors exceeds the number of permitted retry. The inverter output will stop solidly installed. Operation panel FR-PA02-02 and FR-PU04
E.RET Retry Exceeds If the operation is not resumed within the number of retry attempts, this function will stop the inverter output.
E. CPU CPU error If the built-in CPU arithmetic operation is not completed within a predetermined time, the inverter self-test will alarm and stop the output. Please contact the sales outlet or the headquarters office.
E. 3 Abnormal option When using the inverter's dedicated communication option, the inverter will stop outputting when the setting is wrong or the contact interface is faulty. The connection of the communication option is indeed connected.
E.6 CPU error The inverter stops outputting when the built-in CPU communication error occurs. E.LF outputs the under-phased protection. This function stops the inverter's output when one phase of the inverter (load side) three-phase (UVW) is disconnected.
Correct wiring
Confirm Pr. 251 Output Phase Loss Protection Selected Settings
E.FN Fan Fault A cooling fan is included in the inverter. When the cooling fan is faulty or the operation is different from the setting of Pr.244 “Cooling Fan Action Selectionâ€, FN is displayed on the operation panel.
OL Stall Prevents Overcurrent from Accelerating If the current exceeds 150% of the rated output current of the inverter, the stop frequency rises until the overload current decreases to prevent the inverter from overcurrent breaking when the current drops to 150%. Then increase the frequency and then continue to increase the frequency. If the current exceeds 150 (%) Note 4 or more of the rated output current of the inverter, reduce the frequency until the overload current decreases to prevent the inverter from overcurrent breaking. When the current drops to 150 (% If the current exceeds 150% of the rated output current of the inverter, then the drop of the stop frequency is reduced until the overload current is reduced to prevent the inverter from overcurrent when the current is reduced. Less than 150 (%) and then decrease the frequency
The Schottky Diode is another type of semiconductor diode which can be used in a variety of wave shaping, switching and rectification applications the same as any other junction diode. The main adavantage is that the forward voltage drop of a Schottky Diode is substantially less than the 0.7 volts of the conventional silicon pn-junction diode.
Schottky diodes have many useful applications from rectification, signal conditioning and switching, through to TTL and CMOS logic gates due mainly to their low power and fast switching speeds.
the Schottky Diode also known as a Schottky Barrier Diode is a solid-state semiconductor diode in which a metal electrode and an n-type semiconductor form the diodes ms-junction giving it two major advantages over traditional pn-junction diodes, a faster switching speed, and a low forward bias voltage.
The metal–to-semiconductor or ms-junction provides a much lower knee voltage of typically 0.3 to 0.4 volts compared against a value of 0.6 to 0.9 volts seen in a standard silicon base pn-junction diode for the same value of forward current.
Variations in the metal and semiconductor materials used for their construction means that silicon carbide (SiC) Schottky diodes are able to turn [ON" with with a forward voltage drop as little as 0.2 volts with the Schottky diode replacing the less used germanium diode in many applications requiring a low knee voltage.
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