Mitsubishi Electric FR-A800 Troubleshooting Course

This fault occurs when the detected output current exceeds a pre-defined level set by parameter M460 (Pr.150), and the detection operation is enabled by M464 (Pr.167). It indicates an excessive current condition, potentially due to an overload or short circuit at startup, causing the FR-A800 inverter to trip.

This fault indicates that the FR-A800 inverter detected an instantaneous loss or significant sag of the incoming AC power supply voltage. The inverter has tripped to protect itself and the motor from unstable operation.

This fault indicates that one or more output phases from the FR-A800 inverter to the motor are either open-circuited or have a significant current imbalance. This can lead to motor overheating, reduced torque, and damage to the motor or inverter if operation continues.

This fault occurs when the external thermal relay connected to the CS-SD terminals has tripped, indicating an overload condition detected by an external device. The FR-A800 inverter output is shut off to protect the motor and system. This fault is triggered when parameter T708 (Pr.186) (CS terminal function selection) is set to '7' (external thermal relay input) and the CS-SD terminal circuit becomes open.

The FR-A800 inverter has tripped due to the activation of the stall prevention function, which has escalated to a stop condition. This occurs when the overcurrent condition persists despite stall prevention limiting, indicating that the motor or load is severely overloaded or there is a mechanical issue preventing the motor from following the command.

This fault occurs when an incompatible or non-existent regenerative option is selected in parameter E300 (Pr.30), such as a high-efficiency converter or power supply regeneration common converter, but no such option is connected or detected by the FR-A800 inverter. The inverter will trip to prevent incorrect operation.

This fault occurs when the DC bus voltage in the FR-A800 inverter exceeds a permissible limit during deceleration, due to regenerative energy from the motor returning to the DC bus. This typically happens when the deceleration time is too short or the braking capacity (resistor or other means) is insufficient to dissipate the regenerative energy.

This fault indicates a short circuit on the FR-A800 inverter's internal or external 24 VDC power supply output, typically used for control circuit power or external sensors. The inverter trips to protect its internal power supply and connected devices.

This fault indicates that the FR-A800 inverter's PU (Programming Unit, i.e., control panel or HMI) has been disconnected while parameter E101 (Pr.75) is configured to shut off the inverter output upon detection of PU disconnection. This protects the system from unintended operation if the control interface is removed.

The FR-A800 inverter's internal electronic thermal overload relay has tripped, indicating that the motor has been subjected to a continuous overload condition exceeding its thermal capacity for an extended period. This protects the motor from overheating and damage.

This fault indicates a problem with the USB communication connection between the FR-A800 inverter and an external device (e.g., FR Configurator2 software). It occurs when the USB cable is disconnected or communication is interrupted while N041 (Pr.548) (USB communication check time interval) is configured to detect such disconnections.

This fault indicates that the DC bus voltage within the FR-A800 inverter has dropped below a specified minimum threshold. This typically occurs due to low incoming AC supply voltage or during an instantaneous power failure event. The inverter trips to prevent damage from insufficient operating voltage.

This is a general error indication displayed by the FR-A800 inverter, signifying that a fault condition has occurred. The specific cause requires further diagnosis, typically by checking the fault history or other indicators on the operation panel, as this code is a placeholder for a more specific issue.

This warning indicates that the FR-A800 inverter's cooling fan speed has dropped to 50% or less of its nominal speed, or one or more fans are failing in systems with multiple fans. This signifies that the inverter's cooling capacity is reduced, which can lead to overheating and premature failure of internal components if not addressed. E700 (Pr.255) bit 2 is turned ON when this warning occurs.

The FR-A800 inverter has detected an instantaneous overcurrent condition in the output stage, exceeding its current limit. This can occur during acceleration, deceleration, or constant speed operation, and is a protective trip to prevent damage to the inverter's power devices (IGBTs) and the motor.

This alarm indicates that the FR-A800 inverter's stall prevention function has activated due to an overcurrent condition, typically during acceleration, constant speed, or deceleration. The inverter attempts to prevent a trip by limiting the output current, which may result in reduced speed or torque. It is often a precursor to an OC trip if the condition persists.