Mitsubishi Electric FR-E500

A fault has occurred in the brake transistor circuit, leading to the inverter output stopping. This typically happens when the regenerative energy from the motor is excessively large, exceeding the capacity of the brake transistor or optional brake resistor. This protective function is only active when an optional brake resistor is connected.

This warning appears when the inverter continues to operate despite an error detected in the communication line or communication option, specifically when Pr.502 is set to '6'. It indicates an ongoing communication problem that, while not immediately stopping the inverter, requires attention.

A fault has occurred in the inverter's parameter storage device, such as an E2PROM fault. This indicates an issue with the non-volatile memory that stores inverter parameters, potentially leading to lost or corrupted settings.

The inverter's built-in CPU failed to complete an arithmetic operation within a predetermined timeframe, triggering an internal alarm and stopping the output. This indicates a critical internal processing error within the inverter.

This warning appears when the inverter detects that its assigned IP address is already in use by another device on the network. This conflict prevents proper network communication and can cause system instability.

This function stops the inverter output if an open phase condition is detected in one of the three output phases (U, V, W) on the load side. An open phase can lead to motor overheating, vibration, and damage, or unstable operation.

The inverter output is shut off due to a contact failure between the inverter and a plug-in option, or if a manufacturer setting switch on the plug-in option has been altered. Excessive electrical noise around the inverter can also contribute to this fault. This compromises the functionality of the plug-in option.

The inverter has detected an output current fault, specifically an earth (ground) fault, on its output side (affecting the motor or connection cable). This indicates a breakdown in insulation, leading to current leakage to ground. An earth fault is a significant safety hazard and can cause severe damage to the motor or inverter if unresolved.

During torque control under Real sensorless vector control, if the speed command and estimated speed directions differ when reversing, the motor may not decelerate correctly at low speeds. This leads to an overload condition, shutting off the inverter output. This protective function is specific to Real sensorless vector control and prevents motor overcurrents.

This fault indicates a general malfunction within the inverter's internal circuitry. The specific cause is not detailed in the manual, suggesting a fundamental hardware problem that cannot be resolved through basic troubleshooting. Continued attempts to operate with this fault may lead to further damage.

The inverter output is shut off because a user-defined protective function, configured via the PLC function, has been activated. This occurs when a value between "16" and "20" is written to the special register SD1214 while the PLC function is enabled (Pr.414 is not "0"). It signifies a condition that the user's PLC program has flagged as a fault.

The inverter output is shut off if an incorrect signal type or magnitude (e.g., 30mA+ current or 7.5V+ voltage) was detected on terminal 2 or 4, contrary to the parameter settings for current input. This indicates a mismatch between the physical input signal and the configured analog input type.

The inverter output is shut off due to a fault in the brake circuit, typically indicating damage to the brake transistor. This is a critical internal hardware fault requiring immediate attention to prevent further damage.

The inverter output has been shut off because the output current exceeded the threshold set in Pr.150 Output current detection level. This protective function is only active when Pr.167 Output current detection operation selection is set to "1". It indicates an overcurrent condition that is monitored independently of the main overcurrent trip.

This fault indicates that the installed circuit board is either incompatible with the specific inverter model or is not correctly seated/connected within the inverter. The inverter will cease operation to prevent potential damage. An incorrect or improperly connected board can lead to system malfunction or inability to perform intended functions.

The inverter output is shut off due to a communication fault within the built-in CPU, potentially indicated by specific sub-faults (E.5, E.6, E.7 on FR-LU08). This can be triggered by excessive electrical noise in the environment or an improper connection of an Ethernet communication cable. An internal CPU fault can render the inverter inoperable.

This fault indicates an interruption in Ethernet communication, often due to physical factors, when signal loss detection (Pr.1431 or Pr.1457 = '3') is enabled. The inverter output shuts off if communication is broken for the time set in Pr.1432. It can also occur in CC-Link IE Field Network Basic if data isn't received or the cyclic transmission status bit turns OFF, or in BACnet/IP if conflicting IP addresses are detected. A communication fault can stop critical processes and lead to loss of control over the inverter.

This fault indicates that the inverter's internal heat sink has exceeded its safe operating temperature, triggering a temperature sensor and shutting down the inverter output. This usually happens when the ambient temperature is too high, the heat sink is blocked by debris, or the cooling fan is not functioning correctly. Sustained overheating shortens the lifespan of inverter components and can lead to permanent damage.

The inverter output is shut off if an earth (ground) fault overcurrent flows on the inverter's output side (motor/load side). This protective shutdown prevents electrical hazards, motor damage, and further system failures due to insulation breakdown.

This fault occurs when Pr.872 (Input phase loss protection selection) is enabled ('1') and one of the three phases of the input power supply to a three-phase model inverter is lost. The inverter immediately shuts off its output to prevent damage. This condition indicates a break, loose connection, or failure in one of the incoming power lines. Continued operation with a phase loss can lead to severe damage to the inverter's input rectifier bridge.

The inverter output is shut off when the resistor in the inrush current limit circuit has overheated, indicating a fault within this circuit. This typically results from frequent power ON/OFF cycles or a damaged component within the inrush current path. Continued operation with this fault risks further component damage.

The inverter output is shut off when the load on the motor falls below the defined lower limit fault detection range. This protective function detects abnormally light load conditions, potentially indicating a mechanical issue or a disconnected load, and is active only when Pr.1491 is not '9999'.

The inverter output is shut off if one of the three phases (U, V, W) on the output side (motor/load side) is lost. This typically indicates a broken wire, loose connection, or open circuit in the motor wiring, leading to unbalanced currents and potential motor overheating.

The inverter output is shut off when the load on the motor exceeds the defined upper limit fault detection range. This is a protective function to prevent damage from excessive loading, active only when Pr.1490 is not set to '9999'.

When the inverter's output current rapidly increases to approximately 230% of the rated current during the acceleration phase, the internal protection circuit is triggered, leading to an immediate shutdown of the inverter output. This can indicate excessive load, improper acceleration settings, or an output short-circuit condition. Left unaddressed, this can cause repeated trips, motor damage, or inverter component stress.

This fault occurs when the inverter's output current reaches or exceeds approximately 230% of the rated current while operating at a constant speed. This activates the protection circuit, causing the inverter output to shut down. Common causes include sudden load changes, output short-circuits, or incorrect control parameters. Repeated overcurrent can lead to motor and inverter damage.

The inverter output current has exceeded approximately 230% of its rated value during deceleration, causing the protection circuit to activate and shut off the inverter. This can be caused by sudden speed reductions, an output short-circuit, or issues with the mechanical brake. Unresolved, it can lead to component stress and potential damage.

The inverter output is shut off because an external thermal relay (for motor overheat protection) or an internally mounted motor thermal relay has activated (contacts open). This protective shutdown prevents motor damage from excessive temperature, and is active when '7' (OH signal) is assigned to Pr.178-Pr.184.

The inverter output is shut off if stall prevention operation causes the output frequency to drop to 0.5 Hz for 3 seconds, or if torque limit operation causes frequency to drop to Pr.865 and output torque exceeds Pr.874 for 3 seconds in speed control. This protective fault indicates severe motor overload or an issue with stall prevention settings.

The inverter output is shut off due to a communication line error in the installed communication option. This can stem from incorrect option settings, a loose plug-in option card, or a damaged communication cable, including improper termination. Loss of communication functionality can disrupt system control.

This fault appears under several conditions: if a plug-in option for torque command is selected (Pr.804) but no option is mounted, if a manufacturer setting switch on a plug-in option is changed, or if a communication option is connected while Pr.296 (Password lock level) is set to '0' or '100'. It indicates an incorrect configuration or an issue with an installed option.

The motor speed has exceeded the configured Pr.374 Overspeed detection level under encoder feedback, Real sensorless vector, Vector, or PM sensorless vector control, leading to an inverter shutdown. This protective function prevents mechanical damage from excessive speed.

The inverter output is shut off because the motor speed significantly deviated from the command value during Vector or PM sensorless vector control, preventing proper control. This usually occurs when Pr.285 Speed deviation excess detection frequency is active and can be caused by sudden load changes or incorrect parameter settings. Prolonged deviation can lead to unstable operation.

Regenerative power or a power supply surge has caused the inverter's internal main circuit DC voltage to rise above the specified limit, triggering the protective shutdown. This can occur with rapid acceleration, especially with vertical loads, or if stall prevention settings are incorrect. Continued overvoltage can damage inverter components.

A fault has occurred in the inverter's parameter storage (EEPROM failure) on the control circuit board, causing the inverter output to shut off. This often results from an excessively high number of write operations to the EEPROM, leading to degradation. This fault indicates a potential hardware degradation that can affect parameter retention.

A critical fault has occurred in the inverter's main circuit board, specifically related to the storage of inverter model information. This indicates an internal memory corruption or hardware failure which prevents the inverter from identifying itself or its configuration. This is a severe internal fault requiring factory attention.

The inverter output is shut off if, during PID control, the measured feedback value goes outside the limits set by Pr.131 (PID upper limit) or Pr.132 (PID lower limit), or if the absolute deviation from the setpoint exceeds Pr.553 (PID deviation limit). This protective function is not active by default and must be enabled via Pr.554. An erroneous PID signal can lead to unstable process control or unexpected shutdowns, indicating a sensor issue or incorrect parameter tuning.

This error code indicates a communication fault originating from the PU connector, specifically related to RS-485 communication. When the E.PUE fault occurs, the inverter's operation stops, and communication via the PU connector is interrupted. During this fault state, the inverter cannot be reset using a computer connected via the PU connector.

The inverter output is shut off because an automatic fault recovery attempt (retry) failed to resolve a preceding fault within the number of retries configured in Pr.67 Number of retries at fault occurrence. This means the underlying problem persists despite multiple attempts to restart, preventing the inverter from resuming normal operation.

The inverter output has been shut off due to a detected fault in the safety circuit or a functional safety-related issue. This can be caused by a broken wire in the safety input terminals (S1, S2, PC) when using safety functions, or general functional safety failures in Safety Communication models. This critical fault ensures machinery cannot operate unsafely.

The inverter output is shut off when the motor loses synchronization during operation, a condition specifically monitored under PM sensorless vector control. This fault indicates a loss of control over the motor's rotor position, leading to erratic operation.

The inverter's electronic thermal O/L relay function detects when the motor is overheating due to excessive load or insufficient cooling, especially during low-speed operation. A pre-alarm (TH) is issued at 85% of the Pr.9 setting, and the inverter output stops when the accumulated heat reaches the trip level. This protection may be insufficient for multiple or special motors, requiring an external thermal relay. Overheating can severely damage the motor windings.

The inverter output has shut off because USB communication was interrupted for a duration exceeding the time set in Pr.548 USB communication check time interval. This indicates a break in the USB connection or an incorrectly configured communication watchdog timer. Loss of communication will prevent external control and monitoring.

This protective function activates, particularly with PM motors, when the converter voltage drops due to power supply issues like power failure or voltage sags. This causes the motor to coast, and if an automatic restart function is enabled, it may lead to repeated restarting and coasting cycles. Insufficient input voltage can prevent the inverter from maintaining stable operation and delivering rated power, potentially leading to inconsistent process control.

This fault appears when Ethernet communication is interrupted by physical factors, especially when Pr.1431 (Ethernet signal loss detection function selection) is set to a value between '1' and '3'. It signifies a physical layer problem with the Ethernet connection to the inverter.

This error occurs if a parameter setting was attempted while Pr.77 (Parameter write selection) disables write operations, if frequency jump ranges (Pr.31 to Pr.36) overlap, or if communication between the PU (Parameter Unit) and the inverter is abnormal. It indicates an issue preventing parameter modification or a communication problem.

This error signifies that a parameter write was attempted while Pr.77 (Parameter write selection) was set to '0', which explicitly disables parameter write operations during inverter run-time. It prevents accidental or unauthorized parameter changes while the system is active.

This error indicates that the analog input bias and gain calibration values (specifically C3, C4, C6, and C7) have been set too close to each other. This can lead to inaccurate analog signal processing and incorrect inverter behavior.

This error occurs if parameter setting was attempted in External or NET operation mode while Pr.77 (Parameter write selection) is '1', or if parameter write was attempted when the command source is not the operation panel. It indicates a conflict between the current operating mode or command source and the attempt to write parameters.

This indication appears when the inverter's internal cooling fan stops operating due to a fault or operates in a manner inconsistent with the setting of Pr. 244 'cooling fan operation selection'. A faulty cooling fan can lead to inverter overheating and subsequent shutdowns.

This function stops the inverter output if a ground fault overcurrent (alarm output E.GF) is detected on the inverter's output (load) side, affecting the motor or its connection cable. This protection can be enabled or disabled at inverter startup using Pr. 249. If enabled (Pr. 249=1), there will be an approximate 20ms output delay at every start.

This fault indicates that the inverter's cooling fin has overheated, activating an internal overheat sensor and stopping the inverter output. This condition signifies either insufficient cooling, high ambient temperatures, or a blocked cooling path, posing a risk of damage to the inverter's power components.

The operation panel is in a locked state, disabling all operations except pressing the STOP/RESET key. This feature is typically used to prevent unintended changes to inverter operation parameters or commands.

This warning appears when the configured IP address or subnet mask for the inverter falls outside the specified valid range. This indicates an invalid network configuration that will prevent the inverter from communicating correctly on the network.

This warning appears when the current load on the inverter deviates from the detection width defined by Pr.1488 (Upper limit warning detection width) or Pr.1489 (Lower limit warning detection width). It indicates an unexpected load condition, either too heavy or too light, potentially due to equipment issues.

The password function is active, restricting the display and setting of parameters. This security feature prevents unauthorized access and modification of the inverter's configuration.

This indicator appears when the inverter's cumulative energization time reaches or exceeds the value set in parameter Pr.504. It serves as a reminder that routine maintenance may be due for the equipment.

The inverter output is shut off because the output current reached or exceeded approximately 200% of the rated current during the acceleration phase. This indicates that the motor load is too high for the acceleration rate, or there is an issue with the motor or wiring.

The inverter output is shut off because the output current reached or exceeded approximately 200% of the rated current during the deceleration phase. This can be caused by too rapid deceleration, issues with mechanical braking, or a fault in the motor/wiring.

This fault indicates that an external thermal relay, typically used for motor overheat protection, or an internally mounted temperature relay in the motor, has operated (contacts opened), causing the inverter output to stop. The inverter requires a reset to restart after this fault. This function is active only when '7' (OH signal) is assigned to Pr. 183 'MRS terminal (MRS) function selection'.

The inverter output is stopped due to an internal connector fault within an optional device connected to the inverter. This indicates a communication or connection issue with an installed option card or module.

The inverter output is shut off due to regenerative overvoltage, meaning the internal main circuit DC voltage reached or exceeded a specified threshold during acceleration. This can occur if acceleration is too slow for the application, or due to external surge voltages on the power supply.

This indication means the motor has been stopped either by pressing the STOP/RESET key (when enabled in modes other than PU operation via Pr.75) or by the emergency stop function. It signifies a deliberate or emergency shutdown of the motor's operation.

This fault stops the inverter output if communication between the inverter and the Parameter Unit (PU) is suspended due to disconnection or errors. This occurs when specific settings (e.g., '2', '3', '16', or '17') are configured in Pr. 75, or if the number of successive communication errors exceeds the permissible retries when Pr. 121 is set to '9999' for RS-485 communication.

This pre-alarm appears if the regenerative brake duty reaches or exceeds 85% of the value set in Pr.70 (Special regenerative brake duty). It's a warning that the regenerative braking capacity is nearing its limit, and a regenerative overvoltage (E.OV[]) fault may occur if it reaches 100%.

This function stops the inverter output because operation could not be resumed properly within the configured number of retries. This fault indicates that a preceding error condition repeatedly occurred, and the inverter's auto-retry attempts were unsuccessful.

This alarm appears when the safety stop function is activated, resulting in the shutoff of the inverter's output. It signifies a protective measure triggered by an emergency stop device or a disconnection within the safety circuit.

This indicator appears if the speed limit level is exceeded during torque control. It signifies that the inverter is actively limiting the motor speed to the set maximum, preventing it from overrunning.

The inverter output is shut off because the output current reached or exceeded approximately 200% of the rated current while operating at a constant speed. This suggests a sudden increase in load or a fault in the motor/wiring during stable operation.

The running frequency has fallen to 0 due to the activation of the stall prevention function (Overload during stall prevention). This occurs when the motor is under an overload condition, causing the inverter to reduce frequency to prevent tripping.

This pre-alarm appears if the cumulative value of the electronic thermal O/L relay reaches or exceeds 85% of the preset level in Pr.9 (Electronic thermal O/L relay). It serves as a warning that the motor is approaching its thermal limit, and a protective shutdown will activate if 100% is reached.