Mitsubishi FR-E800 Drive

Faults & Alarms

Search from below list for FR-E800 drive faults & alarms:

Fault Code	Cause & Solution
HOLD Operation panel lock	Cause: Operation lock mode is set. Operation other than STOP/RESET is invalid. Solution: – Press MODE for 2s to release lock.
LOCD Password locked	Cause: Password function is active. Display and setting of parameter is restricted. Solution: – Enter the password in Pr. 297 Password lock/unlock to unlock the password function before operating.
Er1 Write disable error	Cause: – You attempted to make parameter setting when Pr. 77 Parameter write selection has been set to disable parameter write. – Frequency jump setting range overlapped. – Adjustable 5 points V/F settings overlapped – The PU and inverter cannot make normal communication Solution: – Check the setting of Pr. 77 Parameter write selection – Check the settings of Pr. 31 to 36 (frequency jump). – Check the connection of the PU and inverter.
Er2 Write error during operation	Cause: Parameter write was attempted while Pr.77 Parameter write selection = “0”. Check point: – Check the Pr. 77 setting. – Check that the inverter is not operating. Solution: – Set “2” in Pr. 77. – After stopping operation, make parameter setting.
Er3 Calibration error	Cause: Analog input bias and gain calibration values are too close. Check point: – Check the settings of C3, C4, C6 and C7 (calibration functions).
Er4 Mode designation error	Cause: – Parameter setting was attempted in the External or NET operation mode while Pr. 77 = “1”. – Parameter write was attempted when the command source is not at the operation panel (FR-DU08). Check point: – Check that operation mode is “PU operation mode”. – Check the Pr. 77 setting. – Check the Pr. 551 setting. Solution: – After setting the operation mode to the “PU operation mode”, make parameter setting. – After setting Pr. 77 = “2”, make parameter setting. – Set Pr.551 = “4”.
Err.	Cause: – The RES signal is on – The PU and inverter cannot make normal communication (contact fault of the connector) – When the voltage drops in the inverter’s input side. – When the control circuit power (R1/L11, S1/L21) and the main circuit power (R/L1, S/L2, T/L3) are connected to a separate power, it may appear at turning ON of the main circuit. It is not a fault. Solution: – Turn OFF the RES signal. – Check the connection of the PU and inverter. – Check the voltage on the inverter’s input side.
OLC Stall prevention (overcurrent)	Cause: – When the output current of the inverter increases, the stall prevention (overcurrent) function is activated. – The following section explains about the stall prevention (overcurrent) function. During acceleration: When the output current (output torque under Real sensorless vector control or Vector control) of the inverter exceeds the stall prevention level (Pr.22 Stall prevention operation level, etc.), this function stops the increase in frequency until the overload current decreases to prevent the inverter from resulting in overcurrent trip. When the overload current is reduced below stall prevention operation level, this function increases the frequency again. During constant– speed operation: When the output current (output torque under Real sensorless vector control or Vector control) of the inverter exceeds the stall prevention level (Pr.22 Stall prevention operation level, etc.), this function reduces frequency until the overload current decreases to prevent the inverter from resulting in overcurrent trip. When the overload current is reduced below stall prevention operation level, this function increases the frequency up to the set value. During deceleration: When the output current (output torque under Real sensorless vector control or Vector control) of the inverter exceeds the stall prevention level (Pr.22 Stall prevention operation level, etc.), this function stops the decrease in frequency until the overload current decreases to prevent the inverter from resulting in overcurrent trip. When the overload current is reduced below stall prevention operation level, this function decreases the frequency again. Check point: – Check that the Pr.0 Torque boost setting is not too large. – The Pr.7 Acceleration time and Pr.8 Deceleration time settings may be too short. – Check that the load is not too heavy. – Check for any failures in peripheral devices. – Check that the Pr.13 Starting frequency is not too large. – Check that Pr.22 Stall prevention operation level is appropriate. Solutions: – Gradually increase or decrease the Pr.0 setting by 1% at a time and check the motor status. – Set a larger value in Pr.7 and Pr.8. – Reduce the load. – Try Advanced magnetic flux vector control, Real sensorless vector control, or Vector control. – Change the Pr.14 Load pattern selection setting. – The stall prevention operation current can be set in Pr.22 Stall prevention operation level. (The initial value is 150% for the ND rating.) The acceleration/deceleration time may change. Increase the stall prevention operation level with Pr.22 Stall prevention operation level, or disable stall prevention with Pr.156 Stall prevention operation selection. (Use Pr.156 to set either operation continued or not at OLC operation.)
OLV Stall prevention (overvoltage)	Cause: During deceleration: – If the regenerative energy of the motor becomes excessive and exceeds the regenerative energy consumption capability, this function stops the decrease in frequency to prevent overvoltage trip. As soon as the regenerative energy has decreased, deceleration resumes. – If the regenerative energy of the motor becomes excessive when regeneration avoidance function is selected (Pr. 882 = 1), this function increases the speed to prevent overvoltage trip. Check point: – Check for sudden speed reduction. – Regeneration avoidance function (Pr. 882 to Pr. 886) is being used? Solution: – The deceleration time may change. Increase the deceleration time using Pr. 8 Deceleration time.
RB Regenerative brake pre-alarm	Cause: Appears if the regenerative brake duty reaches or exceeds 85% of the Pr.70 Special regenerative brake duty value. If the regenerative brake duty reaches 100%, a regenerative overvoltage (E. OV[ ]) occurs. – The RBP signal can be simultaneously output with the [RB] display. For the terminal used for the RBP signal output, assign the function by setting “7” (positive logic) or “107” (negative logic) in any of Pr. 190 to Pr. 196 (output terminal function selection). Check point: – Check that the brake resistor duty is not high. – Check that the Pr.30 Regenerative function selection and Pr.70 settings are correct. Solution: – Increase the deceleration time. – Check the Pr. 30 Regenerative function selection and Pr. 70 Special regenerative brake duty values.
TH Electronic thermal relay function pre-alarm	Cause: Appears if the cumulative value of the electronic thermal O/L relay reaches or exceeds 85% of the preset level of Pr. 9 “Electronic thermal O/L relay”. If the value reaches 100% of Pr. 9 setting, motor overload trip (E.THM) occurs. Check point: – Check for large load or sudden acceleration. – Is the Pr. 9 Electronic thermal O/L relay setting is appropriate? Solution: – Reduce the load weight or the number of operation times. – Set an appropriate value in Pr. 9 Electronic thermal O/L relay.
PS/P5 PU stop	Cause: The motor is stopped using STOP/RESET key under the mode other than the PU operation mode. (To enable STOP/RESET key under the mode other than the PU operation mode, set Pr. 75 “Reset selection/disconnected PU detection/PU stop selection”. Check point: – Check for a stop made by pressing the STOP/RESET key on the operation panel. – Check for whether the X92 signal is OFF. Solution: – Turn OFF the start signal and press the PU/EXT key for release. – Turn ON the X92 signal and OFF the start signal for release.
SL Speed limit indication (output during speed limit)	Cause: Output if the speed limit level is exceeded during torque control. Check point: – Check that the torque command is not larger than required. – Check that the speed limit level is not low. Solution: – Decrease the torque command. – Increase the speed limit level.
SA Safety stop	Cause: Appears when safety stop function is activated (during output shutoff). (Refer to page 83.) Check point: – Check if an emergency stop device is activated. – Check if the shorting wire between S1 and PC or between S2 and PC is disconnected when not using the safety stop function. Solution: – An emergency stop device is active when using the safety stop function. Identify the cause of emergency stop, ensure the safety and restart the system. – When not using the safety stop function, short across terminals S1 and PC and across S2 and PC with shorting wire for the inverter to run. – If “SA” is indicated when wires across S1 and SIC and across S2 and SIC are both conducted while using the safety stop function (drive enabled), internal failure might be the cause. Check the wiring of terminals S1, S2, and SIC and contact your sales representative if the wiring has no fault.
MT Maintenance timer	Cause: Appears when the inverter’s cumulative energization time reaches or exceeds the parameter set value. Set the time until the MT is displayed using Pr.504 Maintenance timer warning output set time (MT). “MT” does not appear when the setting of Pr.504 is the initial value (“9999”). Check point: – The set time of maintenance timer has been exceeded. Solution: – Take appropriate countermeasures according to the purpose of the maintenance timer setting. Setting “0” in Pr.503 Maintenance timer clears the indication.
CF Continuous operation during communication fault	Cause: Appears when the operation continues while an error is occurring in the communication line or communication option (when Pr.502 = “6”). Check point: – Check for a break in the communication cable. – Check for communication option faults. Solution: – Check the connection of communication cable. – Replace the communication option.
LDF Load fault warning	Cause: Appears when the load is deviated from the detection width set in Pr.1488 Upper limit warning detection width or Pr.1489 Lower limit warning detection width. Check point: – Check if too much load is applied to the equipment, or if the load is too light. – Check that the load characteristics settings are correct. Solution: – Inspect the equipment. – Set the load characteristics (Pr.1481 to Pr.1487) correctly.
EHR Ethernet communication fault	Cause: Appears when Ethernet communication is interrupted by physical factors while Pr.1431 Ethernet signal loss detection function selection = “1 to 3”. Check point: – Check for a break in the communication cable. – Check for a break in the Ethernet cable. Solution: – Connect the Ethernet board securely. – Check that the Ethernet cable is connected to the Ethernet connector properly and the Ethernet cable is not damaged.
DIP Duplicate IP address	Cause: Appears when duplicate IP address is detected. Check point: – Check that the specified IP address is not overlapping with the IP address of any other device on the network. Solution: – Enter a unique IP address.
IP IP address fault	Cause: Appears when the IP address or the subnet mask is out of the specified range. Check point: – Check that “0 or 255” is not set in the third or fourth octet of the IP address. – Check that the subnet mask setting is appropriate. – Check that the IP address settings are correct. Solution: – Set “1 to 254” in the third or fourth octet of the IP address. – Set the subnet mask (Pr.1438 to Pr.1441) correctly. – Set the IP address (Pr.1434 to Pr.1447) correctly.
SE Incorrect parameter setting	Cause: Appears when a start command is input while the condition to start operation is not satisfied in the motor setting (Pr.71, Pr.450, Pr.80, Pr.453, Pr.81, or Pr.454) for the control method selected in Pr.800 or Pr.451. Check point: – Check that the motor setting is appropriate for the control method. Solution: – Change the control method setting or the motor setting as appropriate.
UV Undervoltage	Cause: If the power supply voltage of the inverter decreases, the control circuit will not perform normal functions. In addition, the motor torque will be insufficient and/or heat generation will increase. To prevent this, if the power supply voltage decreases to about 115 VAC (230 VAC for the 400 V class, 330 VAC for the 575 V class) or below, this function shuts off the inverter output and “UV” is displayed. The warning is removed when the voltage returns to normal. Check point: – Check that the power supply voltage is normal. Solution: – Check the devices on the power system such as the power supply itself.
FN Fan alarm	Cause: For the inverter that contains a cooling fan, FN appears on the operation panel when the cooling fan stops due to a fault, low rotation speed, or different operation from the setting of Pr.244 Cooling fan operation selection. Check point: – When the cooling fan is replaced, check that the fan is not installed upside down. – Check the cooling fan for a failure. Solution: – Check for fan fault. Install the fan correctly.
E.OC1 Overcurrent trip during acceleration	Cause: When the inverter output current reaches or exceeds approximately 230% *1 of the rated current during acceleration, the protection circuit is activated and the inverter output is shut off. Check point: – Check for sudden speed acceleration. – Check if the downward acceleration time is too long in a lift application. – Check for output short-circuit. – Check that the Pr.3 Base frequency setting is not 60 Hz when the motor rated frequency is 50 Hz. – Check if the stall prevention operation level is set too high. Check if the fast-response current limit operation is disabled. – Check that the regenerative driving is not performed frequently. (Check if the output voltage becomes larger than the V/F reference voltage at regenerative driving and overcurrent occurs due to increase in the motor current.) – Check that the encoder wiring and the specifications (encoder power supply, resolution, differential/ complementary) are correct. Check also that the motor wiring (U, V, W) is correct (under Vector control). – Check that the rotation direction is not switched from forward to reverse rotation (or from reverse to forward) during torque control under Real sensorless vector control. – Check that the inverter capacity matches with the motor capacity. (PM sensorless vector control) – Check if a start command is given to the inverter while the motor is coasting. (PM sensorless vector control) Solution: – Set the acceleration time longer. (Shorten the downward acceleration time of the lift.) – If “E.OC1” always appears at start, disconnect the motor once and restart the inverter. – Check the wiring to make sure that output short circuit does not occur. – Set 50 Hz in Pr.3 Base frequency. – Lower the stall prevention operation level. Activate the fast-response current limit operation. – Set the base voltage (rated voltage of the motor, etc.) in Pr.19 Base frequency voltage. – Check the wiring and specifications of the encoder and the motor. Perform the setting according to the specifications of the encoder and the motor (under Vector control). – Prevent the motor from switching the rotation direction from forward to reverse (or from reverse to forward) during torque control under Real sensorless vector control. – Choose inverter and motor capacities that match. (PM sensorless vector control) – Input a start command after the motor stops. Alternatively, use the automatic restart after instantaneous power failure / flying start function. (PM sensorless vector control)
E.OC2 Overcurrent trip during constant speed	Cause: When the inverter output current reaches or exceeds approximately 230% of the rated current during constant-speed operation, the protection circuit is activated and the inverter output is shut off. Check point: – Check for sudden load change. – Check for a short-circuit in the output circuit. – Check if the stall prevention operation level is set too high. Check if the fast-response current limit operation is disabled. – Check that the rotation direction is not switched from forward to reverse rotation (or from reverse to forward) during torque control under Real sensorless vector control. – Check that the inverter capacity matches with the motor capacity. (PM sensorless vector control) – Check if a start command is given to the inverter while the motor is coasting. (PM sensorless vector control) Solutions: – Keep the load stable. – Check the wiring to make sure that output short circuit does not occur. – Lower the stall prevention operation level. Activate the fast-response current limit operation. – Prevent the motor from switching the rotation direction from forward to reverse (or from reverse to forward) during torque control under Real sensorless vector control. – Choose inverter and motor capacities that match. (PM sensorless vector control) – Input a start command after the motor stops. Alternatively, use the automatic restart after instantaneous power failure / flying start function. (PM sensorless vector control)
E.OC3 Overcurrent trip during deceleration or stop	Cause: When the inverter output current reaches or exceeds approximately 230% *3 of the rated current during deceleration (other than acceleration or constant speed), the protection circuit is activated and the inverter output is shut off. Check point: – Check for sudden speed reduction. – Check for output short-circuit. – Check for too fast operation of the motor’s mechanical brake. – Check if the stall prevention operation level is set too high. Check if the fast-responsecurrent limit operation is disabled. – Check that the inverter capacity matches with the motor capacity.(PM motor control) – Check if a start command is given to the inverter while the motor is coasting.(PM motor control) Solutions: – Set the deceleration time longer. – Check the wiring to make sure that output short circuit does not occur. – Check the mechanical brake operation. – Lower the stall prevention operation level. Activate the fast-response current limitoperation. – Choose inverter and motor capacities that match. (PM motor control) – Input a start command after the motor stops. Alternatively, use the automatic restart afterinstantaneous power failure/flying start function.
E.OV1 Regenerative overvoltage trip during acceleration	Cause: If regenerative energy causes the inverter’s internal main circuit DC voltage to reach or exceed the specified value, the protective circuit is activated to stop the inverter output. The circuit may also be activated by a surge voltage produced in the power supply system. Check point: – Check for too slow acceleration. (e.g. during downward acceleration in vertical lift load) – Check that the Pr.22 Stall prevention operation level is not set to the no load current or lower. – Check if the stall prevention operation is frequently activated in an application with a large load inertia. Solution: – Set the acceleration time shorter. Use the regeneration avoidance function (Pr.882, Pr.883, Pr.885, and Pr.886). – Set a value larger than the no load current in Pr.22. – Set Pr.154 Voltage reduction selection during stall prevention operation = “11”.
E.OV2 Regenerative overvoltage trip during constant speed	Cause: If regenerative energy causes the inverter’s internal main circuit DC voltage to reach or exceed the specified value, the protective circuit is activated to stop the inverter output. The circuit may also be activated by a surge voltage produced in the power supply system. Check point: – Check for sudden load change. • Check that the Pr.22 Stall prevention operation level is not set to the no load current or lower. • Check if the stall prevention operation is frequently activated in an application with a large load inertia. • Check that acceleration/deceleration time is not too short. Solution: – Keep the load stable. – Use the regeneration avoidance function (Pr.882, Pr.883, Pr.885, and Pr.886). – Use a brake resistor or brake unit, or the multifunction regeneration converter (FR-XC) as required. – Set a value larger than the no load current in Pr.22. – Set Pr.154 Voltage reduction selection during stall prevention operation = “11”. – Set the acceleration/deceleration time longer. (Under Vector control or Advanced magnetic flux vector control, the output torque can be increased. However, sudden acceleration may cause an overshoot in speed, resulting in an occurrence of overvoltage.)
E.OV3 Regenerative overvoltage trip during deceleration or stop	Cause: If regenerative energy causes the inverter’s internal main circuit DC voltage to reach or exceed the specified value, the protective circuit is activated to stop the inverter output. The circuit may also be activated by a surge voltage produced in the power supply system. Check point: – Check for sudden speed reduction. Solution: – Set the deceleration time longer. (Set the deceleration time which matches the moment of inertia of the load.) – Make the brake cycle longer. – Use the regeneration avoidance function. – Use the brake unit, multifunction regeneration converter (FR-XC). – Set Pr.154 Voltage reduction selection during stall prevention operation = “10 or 11”.
E.THT Inverter overload trip (electronic thermal relay function)	Cause: If the temperature of the output transistor elements exceeds the protection level with a rated output current or higher flowing without the overcurrent trip (E.OC[]), the inverter output is stopped. (Overload capacity 150% 60 s) Check point: – Check that acceleration/deceleration time is not too short. – Check that torque boost setting is not too large (small). – Check that load pattern selection setting is appropriate for the load pattern of the using machine. – Check the motor for use under overload. Solutions: – Increase acceleration/deceleration time. – Adjust the torque boost setting. – Set the load pattern selection setting according to the load pattern of the using machine. – Reduce the load weight.
E.THM Motor overload trip	Cause: The electronic thermal O/L relay function in the inverter detects motor overheat, which is caused by overload or reduced cooling capability during low-speed operation. When the cumulative heat value reaches 85% of the Pr.9 Electronic thermal O/L relay setting, pre-alarm (TH) is output. When the accumulated value reaches the specified value, the protection circuit is activated to stop the inverter output. When the inverter is used to drive a dedicated motor, such as a multiple-pole motor, or several motors, the motor cannot be protected by the electronic thermal O/L relay. Install an external thermal relay on the inverter output side. Check point: – Check the motor for use under overload. – Check that the setting of Pr. 71 Applied motor for motor selection is correct. – Check that stall prevention operation setting is correct. Solution: – Reduce the load weight. – For a constant-torque motor, set the constant-torque motor in Pr. 71 Applied motor. – Check that stall prevention operation setting is correct.
E.FIN Heatsink overheat	Cause: When the heat sink overheats, the temperature sensor is activated, and the inverter output is stopped. – The FIN signal can be output when the temperature becomes approximately 85% of the heat sink overheat protection operation temperature. – For the terminal used for the FIN signal output, assign the function by setting “26 (positive logic) or 126 (negative logic)” from Pr.190 to Pr.196 (Output terminal function selection). Check point: – Check for too high surrounding air temperature. – Check for heatsink clogging. – Check that the cooling fan is stopped. (Check that “Fn” is displayed on the operation panel.) Solution: – Set the surrounding air temperature to within the specifications. – Clean the heatsink. – Replace the cooling fan.
E.UVT Undervoltage	Cause: When a PM motor is used, the protective function is activated in the following case: a fault such as power failure or voltage drop occurs, the converter voltage drops to cause the motor to coast, and restarting and coasting are repeated by the automatic restart after instantaneous power failure function. Check point: – Check that no fault is found in the power supply. Solution: – Check the power supply system equipment such as the power supply. – Supply appropriate power.
E.ILF Input phase loss	Cause: When Pr.872 Input phase loss protection selection is enabled (“1”) and one of the three-phase power input is lost, the inverter output is shut off. This protective function is not available when “0” is set in Pr.872. This protective function is available for the three-phase power input model. Check point: – Check for a break in the cable for the three-phase power supply input. Solution: – Wire the cables properly. – Repair a break portion in the cable. – Check the Pr. 872 Input phase loss protection selection setting.
E.OLT Stall prevention stop	Cause: V/F- If the output frequency has fallen to 0.5 Hz by stall prevention operation and remains for 3 seconds, a fault (E.OLT) appears and the inverter is shut off. OLC or OLV appears while stall prevention is being activated. PM- When speed control is performed, a fault (E.OLT) appears and the inverter output is shut off if frequency drops to the Pr.865 Low speed detection (initial value is 1.5 Hz) setting by torque limit operation and the output torque exceeds the Pr.874 OLT level setting (initial value is 150%) setting and remains 3 seconds. Check point: – Check the motor for the use under overload. – Check that the Pr.865 and Pr.874 values are correct. (Check the Pr.22 Stall prevention operation level setting under V/F control and Advanced magnetic flux vector control.) – Check if a motor is connected under PM sensorless vector control. Solution: – Reduce the load. – Change the Pr.22, Pr.865, and Pr.874 values. (Check the Pr.22 setting under V/F control and Advanced magnetic flux vector control.) – For the test operation without connecting a motor, select the PM sensorless vector control test operation. – Also check that the stall prevention (overcurrent) warning (OLC) or the stall prevention (overvoltage) warning (OLV) countermeasure is taken.
E.SOT Loss of synchronism detection	Cause: The inverter output is shut off when the motor operation is not synchronized. (This function is only available under PM sensorless vector control.) Check point: – Check that the PM motor is not driven overloaded. – Check if a start command is given to the inverter while the PM motor is coasting. – Check if a motor is connected under PM sensorless vector control. – Check if a PM motor other than the MM-EFS/MM-THE4 series is driven. Solution: – Set the acceleration time longer. – Reduce the load. – If the inverter restarts during coasting, set Pr.57 Restart coasting time ≠ “9999”, and select the automatic restart after instantaneous power failure. – Check the connection of the IPM motor. – For the test operation without connecting a motor, select the PM sensorless vector control test operation. – When driving a PM motor, offline auto tuning must be performed.
E.LUP Upper limit fault detection	Cause: The inverter output is shut off when the load exceeds the upper limit fault detection range. This protective function is not available in the initial setting of Pr.1490 (Pr.1490 = “9999”). Check point: – Check if too much load is applied to the equipment. – Check that the load characteristics settings are correct. Solution: – Inspect the equipment. – Set the load characteristics (Pr.1481 to Pr.1487) correctly.
E.LDN Lower limit fault detection	Cause: The inverter output is shut off when the load falls below the lower limit fault detection range. This protective function is not available in the initial setting of Pr.1491 (Pr.1491 = “9999”). Check point: – Check if the equipment load is too light. – Check that the load characteristics settings are correct. Solution: – Inspect the equipment. – Set the load characteristics (Pr.1481 to Pr.1487) correctly.
E.BE Brake transistor alarm detection	Cause: – The inverter output is shut off if a fault due to damage of the brake transistor and such occurs in the brake circuit. – In such a case, the power supply to the inverter must be shut off immediately. Check point: – Reduce the load inertia. – Check that the brake duty is proper. Solution: There is an hardware issue in drive. Need to repair or replace drive.
E.GF Output side earth ground fault	Cause: Description This function stops the inverter output if an earth (ground) fault overcurrent flows due to an earth (ground) fault that occurred on the inverter’s output (load) side. – The inverter output is shut off if an earth (ground) fault overcurrent flows due to an earth (ground) fault that occurred on the inverter’s output side (load side). Check point: – Check for an earth (ground) fault in the motor and connection cable. Solution: – Remedy the earth (ground) fault portion.
E.LF Output phase loss	Cause: This function stops the inverter output if one of the three phases (U, V, W) on the inverter’s output side (load side) is lost. Check point: – Check the wiring (Check that the motor is normal.) – Check that the capacity of the motor used is not smaller than that of the inverter. Solution: – Wire the cables properly.
E.OHT External thermal relay operation	Cause: The inverter output is shut off if the external thermal relay provided for motor overheat protection or the internally mounted thermal relay in the motor, etc. switches ON (contacts open). This function is available when “7” (OH signal) is set in any of Pr.178 to Pr.184 (Input terminal function selection). This protective function is not available in the initial status. (OH signal is not assigned.) (This protective function is available for the standard model and the Ethernet model.) Check point: – Check for motor overheating. – Check that the value “7” (OH signal) is set correctly to any of Pr.178 to Pr.184 (Input terminal function selection). Solution: – Reduce the load and operating duty. – Even if the relay contacts are reset automatically, the inverter will not restart unless it is reset.
E.OPT Option fault	Cause: – Appears when torque command by the plug-in option is selected using Pr.804 Torque command source selection and no plug-in option is mounted. This function is available under torque control. – Appears when the switch for manufacturer setting of the plug-in option is changed. – Appears when a communication option is connected while Pr.296 Password lock level = “0 or 100”. Check point: – Check that the plug-in option for torque command setting is connected. – Check for the password lock with a setting of Pr.296 = “0, 100”. Solution: – Check for connection of the plug-in option. Check the Pr.804 setting. – Set the switch on the plug-in option, which is for manufacturer setting, back to the initial setting. – To apply the password lock when installing a communication option, set Pr.296 ≠ “0, 100”.
E.OP1 Communication option fault	Cause: The inverter trips if a communication line error occurs in the communication option. Check point:  – Check for an incorrect option function setting and operation. – Check that the plug-in option is plugged into the connector properly. – Check for a break in the communication cable. – Check that the terminating resistor is fitted properly. Solution:  – Check the option function setting, etc. – Connect the plug-in option securely. – Check the connection of communication cable.
E.16 to E.20 Fault 16 to Fault 20 User definition error by the PLC function	Cause: The protective function is activated by setting “16 to 20” in the special register SD1214 for the PLC function. The inverter output is shut off when the protective function is activated. The protective function is activated when the PLC function is enabled. This protective function is not available in the initial setting (Pr.414 = “0”). Check point: – Check if “16 to 20” is set in the special register SD1214. Solution: – Set a value other than “16 to 20” in the special register SD1214.
E.PE Parameter storage device fault (control circuit board)	Cause: The inverter output is shut off if a fault occurs in the parameter stored. (EEPROM failure) Check point: – Check for too many number of parameter write times. Solution: – Set “1” in Pr.342 Communication EEPROM write selection (write to RAM) for the operation which requires frequent parameter writing via communication, etc. Note that writing to RAM goes back to the initial status at power OFF.
E.PUE PU disconnection	Cause: – The inverter output is shut off if communication between the inverter and PU is suspended, e.g. the operation panel or parameter unit is disconnected, when the disconnected PU disconnection function is valid in Pr.75 Reset selection/disconnected PU detection/PU stop selection. – The inverter output is shut off if communication errors occurred consecutively for more than permissible number of retries when Pr.121 PU communication retry count ≠ “9999” during the RS-485 communication via the PU connector. – The inverter output is shut off if communication is broken within the period of time set in Pr.122 PU communication check time interval during the RS-485 communication via the PU connector. Check point: – Check that the operation panel or the parameter unit is connected properly. – Check the Pr.75 setting. Solution: – Fit the operation panel or the parameter unit securely.
E.RET Retry count excess	Cause: The inverter output is shut off if the operation cannot be resumed properly within the number of retries set in Pr.67 Number of retries at fault occurrence. This function is available when Pr.67 is set. This protective function is not available in the initial setting (Pr.67 = “0”). Check point: – Find the cause of alarm occurrence. Solution: – Eliminate the cause of the error preceding this error indication.
E.PE2 Parameter storage device fault (main circuit board)	Cause: The inverter output is shut off if a fault occurs in the parameter stored. (EEPROM failure) Solution: There is an hardware or software issue in drive. Need to repair or replace drive.
E. 5 Fault 5 E. 6 Fault 6 E. 7 Fault 7 E.CPU CPU Fault	Cause: Stops the inverter output if the communication error of the built-in CPU occurs. Check point: – Check for devices producing excess electrical noises around the inverter. Solution: · Take measures against noises if there are devices producing excess electrical noises around the inverter. · After this same fault comes then there is an hardware issue in drive. Need to repair or replace drive.
E.CDO Output current detection value exceeded	Cause: Trips the inverter when the output current exceeds the setting of Pr. 150 Output current detection level. – This function is available when Pr. 167 Output current detection operation selection is set to “1”. When the initial value (Pr. 167 = “0”) is set, this protective function is not available. Check point: – Check the settings of Pr. 150 Output current detection level, Pr. 151 Output current detection signal delay time, Pr. 166 Output current detection signal retention time, Pr. 167 Output current detection operation selection.
E.IOH Inrush current limit circuit fault	Cause: The inverter trips when the resistor of the inrush current limit circuit is overheated. The inrush current limit circuit failure Check point: – Check that frequent power ON/OFF is not repeated. – Check if the input side fuse (5A) in the power supply circuit of the inrush current limit circuit contactor (FR-F840-03250(132K) or higher) is blown. – Check that the power supply circuit of inrush current limit circuit contactor is not damaged. Solution: – Configure a circuit where frequent power ON/OFF is not repeated. – If the problem still persists after taking the above measure then there is an hardware issue in drive. Need to repair or replace drive.
E.AIE Analog input fault	Cause: Stops the inverter output when a 30mA or higher current or a 7.5V or higher voltage is input to terminal 2 while the current input is selected by Pr. 73 Analog input selection, or to terminal 4 while the current input is selected by Pr. 267 Terminal 4 input selection. Check point: – Check the Pr.73, Pr.267, and the voltage/current input switch settings Solution: – Either give a current less than 30 mA, or set Pr.73, Pr.267, and the voltage/current input switch to the voltage input and input a voltage.
E.USB USB communication fault	Cause: The inverter output is shut off when the communication is cut off for the time set in Pr.548 USB communication check time interval. Check point: – Check the USB communication cable. Solution: – Check the Pr. 548 USB communication check time interval setting. – Check the USB communication cable. – Increase the Pr. 548 USB communication check time interval setting. Or, change the setting to 9999.
E.SAF Safety circuit fault	Cause: – The inverter output is shut off when a safety circuit fault occurs. – The inverter output is shut off if the either of the wire between S1 and PC or S2 and PC becomes non- conductive while using the safety stop function. – When the safety stop function is not used, the inverter output is shut off when the shorting wire between terminals S1 and PC or across S2 and PC is disconnected. Check point: – Check that the safety relay module or the connection has no fault when using the safety stop function. – Check if the shorting wire between S1 and PC or between S2 and PC is disconnected when not using the safety stop function. Solution: – When using the safety stop function, check that the wiring of terminals S1, S2 and PC is correct and the safety stop input signal source such as a safety relay module is operating properly. – When the safety stop function is not used, short across terminals S1 and PC and across S2 and PC with shorting wires.
E.OS Overspeed occurrence	Cause: The inverter output is shut off when the motor speed exceeds the Pr.374 Overspeed detection level under encoder feedback control, Real sensorless vector control, Vector control, and PM sensorless vector control. This protective function is not available in the initial status. Check point: – Check that the Pr.374 setting is correct. – Check that the setting of Pr.369 Number of encoder pulses does not differ from the actual number of encoder pulses. (Under encoder feedback control or Vector control) Solution: – Set the Pr.374 correctly. – Set Pr.369 correctly. (Under encoder feedback control or Vector control)
E.OSD Speed deviation excess detection	Cause: – When Pr.285 Speed deviation excess detection frequency is set during Vector control or PM sensorless vector control, the inverter output is shut off if the motor speed is increased or decreased by factors such as influence of the load and cannot be controlled in accordance with the speed command value. Check point: – Check that the settings of Pr.285 and Pr.853 Speed deviation time are correct. – Check for sudden load change. – Check that the setting of Pr.369 Number of encoder pulses does not differ from the actual number of encoder pulses. Solution: – Set Pr.285 and Pr.853 correctly. – Keep the load stable. – Set Pr.369 (Pr.851) correctly.
E.ECT Signal loss detection	Cause: The inverter output is shut off when the encoder signal is shut off under orientation control, encoder feedback control or vector control. This protective function is not available in the initial status. Check point: – Check for the encoder signal loss. – Check that the encoder specifications are correct. – Check for a loose connector. – Check that the switch setting of a Vector control compatible option is correct. – Check that the power is supplied to the encoder. Alternatively, check that the power is not supplied to the encoder later than the inverter. – Check that the voltage of the power supplied to the encoder is the same as the encoder output voltage. Solution: – Remedy the signal loss. – Use an encoder that meets the specifications. – Make connection securely. – Make a switch setting of a Vector control compatible option correctly. – Supply the power to the encoder. Alternatively, supply the power to the encoder at the same time as to the inverter. If the power is supplied to the encoder later than the inverter, check that the encoder signal is properly sent and set “0 (initial value)” in Pr.376 Encoder signal loss detection enable/disable selection to disable signal loss detection. – Make the voltage of the power supplied to the encoder the same as the encoder output voltage.
E.MB1 to E.MB7 E.MB1 Fault to E.MB7 Fault Brake sequence fault	Cause: The inverter output is shut off when a sequence error occurs during use of the brake sequence function (Pr.278 to Pr.283). This protective function is not available in the initial status. (The brake sequence function is invalid.) Check point: – Find the cause of the fault occurrence. Solution: – Check the set parameters and perform wiring properly.
E.EHR Ethernet communication fault	Cause: – Appears when Ethernet communication is interrupted by physical factors while Pr.1431 Ethernet signal loss detection function selection = “3” or Pr.1457 Extended setting for Ethernet signal loss detection function selection = “3”. – The inverter output is shut off if Ethernet communication is broken for the time set in Pr.1432 Ethernet communication check time interval or longer for all devices with IP addresses in the range specified for Ethernet command source selection (Pr.1449 to Pr.1454). – Check that the Pr.1432 setting is not too short. – When the CC-Link IE Field Network Basic is used, the inverter output is shut off in the following cases: the data addressed to the own station is not received for the predetermined timeout period or longer, or the status bit of the cyclic transmission addressed to the own station turns OFF (when the master inverter gives a command to stop the cyclic transmission). (For the details of the timeout period, status bit of the cyclic transmission, and command to stop the cyclic transmission, refer to the User’s Manual of the master device which supports the CC-Link IE Field Network Basic.) – When BACnet/IP is used, the inverter output will be shut off after the time period set in Pr.1432 after power is supplied to the inverter if an IP address of any other inverter falls within the Ethernet IP address range set for command source selection. (This protective function is available for the Ethernet model and the safety communication model.) Check point: – Check for a break in the Ethernet cable. – Check that the Pr.1432 setting is not too short. – Check for excessive noise around the inverter. – When the CC-Link IE Field Network Basic is used, check that the timeout period set in the master is not shorter than the period during which the inverter does not receive the data addressed to the own station. – When the CC-Link IE Field Network Basic is used, check that the status bit of the cyclic transmission addressed to the own station is not OFF. – When BACnet/IP is used, check that IP addresses of other inverters are not included in the Ethernet IP address range set for command source selection. Solution: • Check that the Ethernet cable is connected to the Ethernet connector properly and the Ethernet cable is not damaged. • Set a larger value in Pr.1432. • When excessive noise occurs around the inverter, change the communication setting of the master. (The noise may be reduced by setting a shorter timeout period or increasing the number of retries in the communication setting of the master.) • When the CC-Link IE Field Network Basic is used, set a timeout period longer than the period during which the inverter does not receive the data addressed to the own station. When the CC-Link IE Field Network Basic is used, turn ON the status bit of the cyclic transmission addressed to the own station. • When BACnet/IP is used, do not include IP addresses of other inverters in the Ethernet IP address range set for command source selection.
E.CMB Board combination fault	Cause: Appears when the combination of the circuit board and the inverter is not appropriate or when the circuit board is not connected to the inverter. Check point: – Check that the board is connected to the inverter.
E.PID PID signal fault	Cause: The inverter output is shut off if the measured value exceeds the PID upper limit or PID lower limit parameter setting, or the absolute deviation value exceeds the PID deviation parameter setting during PID control. Set this function in Pr.131 PID upper limit, Pr.132 PID lower limit, Pr.553 PID deviation limit and Pr.554 PID signal operation selection. This protective function is not available in the initial status. Check point: – Check the meter for a failure or break. – Check that the parameter settings are correct. Solution: – Check that the meter has no failure or break. – Set the parameters correctly.
E.1 Option fault	Cause: – The inverter output is shut off when a contact failure occurs between the inverter and the plug-in option. – Appears when the switch for manufacturer setting of the plug-in option is changed. Check point: – Check that the plug-in option is plugged into the connector securely. – Check for excessive noise around the inverter. Solution: – Connect the plug-in option securely. – Take measures against noises if there are devices producing excessive electrical noises around the inverter. – Set the switch on the plug-in option, which is for manufacturer setting, back to the initial setting.
E.10 Inverter output fault	Cause: The inverter output is shut off if the inverter detects an output current fault such as an earth (ground) fault that occurred on the inverter’s output side (load side). Check point: – Check for an earth (ground) fault in the motor and connection cable.
E.11 Opposite rotation deceleration fault	Cause: The speed may not decelerate during low speed operation if the rotation direction of the speed command and the estimated speed differ when the rotation is changing from forward to reverse or from reverse to forward during torque control under Real sensorless vector control. The inverter output is shut off when overload occurs due to the un-switched rotation direction. This protective function is not available in the initial status (V/F control). (This function is only available under Real sensorless vector control.) Check point: – Check that the rotation direction is not switched from forward to reverse rotation (or from reverse to forward) during torque control under Real sensorless vector control. Solution: – Prevent the motor from switching the rotation direction from forward to reverse (or from reverse to forward) during torque control under Real sensorless vector control.
E.13 Internal circuit fault	Cause: Appears when the internal circuit is faulty. Solution: There is an hardware or software issue in drive. Need to repair or replace drive.
E.0 No fault history	Cause: Appears when no fault records are stored. (Appears when the fault history is cleared after the protective function has been activated.)