Fronius Symo Advanced Manual

The inverter has detected that the AC voltage from the public grid is above permissible limits. As a safety measure, the inverter disconnects itself from the grid. It will resume feeding energy once grid conditions return to a safe range after a stipulated monitoring period.

The inverter has detected that the AC voltage from the public grid is below permissible limits. The inverter disconnects from the grid and will resume operation once the voltage stabilizes within the acceptable range after a monitoring period.

The grid frequency is above the permissible range, and the inverter cannot feed energy into the grid due to compliance standards. This indicates a grid condition, not an inverter fault.

The grid frequency has dropped below the permissible range. The inverter will disconnect from the grid and will resume operation once the frequency stabilizes within the acceptable range after a monitoring period.

The inverter has detected a loss of connection to the AC public grid. It will disconnect and continuously monitor the grid, attempting to resume feeding energy once the grid is detected and stable.

The inverter has detected an islanding condition, meaning it is operating independently from the main utility grid. This is a safety measure to prevent power feedback into a disconnected grid.

An error has been detected in the Residual Current Monitoring Unit (RCMU). This unit is responsible for monitoring leakage currents to ground for safety.

The inverter has detected an excessive current flow on the AC output side. This causes a short-term interruption of energy feeding, after which the inverter automatically attempts to restart its routine.

The inverter has detected an excessive current flow on the DC input side from the solar modules. This results in a short-term interruption of energy feeding, and the inverter will then attempt to resume its start-up routine.

The DC power module within the inverter has exceeded its safe operating temperature. This triggers a short-term interruption in energy feeding, and the inverter will then attempt to resume operation once the temperature drops.

The AC power module within the inverter has exceeded its safe operating temperature. This causes a short-term interruption in energy feeding, and the inverter will then attempt to resume operation once the temperature drops.

The inverter's internal grid relay is closed, indicating an attempt to feed power, but no energy is being supplied to the grid. This leads to a short-term interruption, followed by the inverter resuming its start-up routine.

The power generated by the photovoltaic array is insufficient to meet the minimum threshold required for the inverter to feed energy into the grid. This causes a short-term interruption, but the inverter will resume its start-up routine when conditions improve. This status code is routinely displayed during periods of low insolation (e.g., morning and evening) and does not indicate a fault at those times.

The DC input voltage from the solar modules is below the minimum threshold required for the inverter to operate and feed energy into the grid. This results in a short-term interruption, but the inverter will resume its start-up routine when conditions improve. This status code is routinely displayed during periods of low insolation (e.g., morning and evening) and does not indicate a fault at those times.

The DC link voltage (intermediate circuit) within the inverter has risen above its maximum permissible operating limit. This causes a short-term interruption in energy feeding, and the inverter will then attempt to resume its start-up routine.

The DC input voltage on Maximum Power Point (MPP) tracker 1 has exceeded its maximum permissible limit. This indicates an overvoltage condition on the specific solar string connected to MPPT1.

The DC input voltage on Maximum Power Point (MPP) tracker 2 has exceeded its maximum permissible limit. This indicates an overvoltage condition on the specific solar string connected to MPPT2.

Communication has been lost between the inverter's control system and its power stage module(s). The inverter will automatically attempt to re-establish the connection and, if successful, resume feeding energy into the grid.

The temperature sensor monitoring the DC power module within the inverter is reporting a fault. This can lead to inaccurate temperature readings and potentially affect thermal management.

The temperature sensor monitoring the AC power module within the inverter is reporting a fault. This can lead to inaccurate temperature readings and potentially affect thermal management.

The inverter has detected an excessive direct current (DC) component being injected into the alternating current (AC) grid. This indicates a potential internal inverter fault and can be problematic for grid stability and other connected equipment.

The inverter is configured for fixed voltage operation, but the set DC input voltage is outside the acceptable range for the connected PV array or the inverter's capabilities. This prevents optimal power generation and grid feed-in.

An external safety device, such as an option card or a RECERBO unit, has activated a safety cut-out. This indicates a critical fault condition that requires the inverter to stop feeding energy into the grid.

Communication has been lost between the inverter's power conversion stage and its central control system. The inverter will automatically attempt to re-establish the connection and, if successful, resume feeding energy into the grid.

The inverter has detected an issue with the identification of its internal hardware components. This can prevent proper operation and requires a firmware update to resolve potential mismatches. The inverter attempts to reconnect.

A conflict has been detected in the unique identification numbers of internal components within the inverter. This can indicate an internal hardware issue or misconfiguration.

An error has occurred related to the Human Interface Device (HID) range. This typically points to an internal communication or identification issue within the inverter's control system.

The inverter has detected a general internal hardware malfunction. This range of codes indicates that a specific hardware component may be faulty, affecting the inverter's operation.

An internal software error or corruption has occurred, preventing the inverter from feeding energy into the grid. This requires specific actions to reset or update the software.

Internal PC boards within the inverter are found to be incompatible, typically after a component replacement. This prevents proper inverter operation, but the inverter attempts to reconnect after detection.

A problem has been detected within the inverter's power stage set, which is responsible for the actual power conversion and grid interaction. This indicates a malfunction in the high-power section of the device.

The DC link voltage (intermediate circuit) within the inverter is either below its minimum operating threshold or unbalanced. This condition prevents the inverter from properly converting and feeding energy into the grid.

A compatibility issue has arisen, often after replacing a PC board, resulting in an invalid configuration of the power stage set. This prevents the inverter from feeding energy into the grid.

An insulation fault has been detected within the inverter or its connected circuits, meaning there is an unintended electrical path to ground. This is a critical safety issue, and the inverter will stop feeding energy into the grid.

An internal safety or monitoring component, referred to as the 'Guard', is not detected or communicating properly within the inverter. This indicates a critical internal system fault.

An error has been detected in the inverter's internal memory. This could indicate data corruption or a hardware failure of the memory module. The inverter will attempt to reconnect after detection.

A failure has occurred in the internal communication links between the inverter's multiple processors. This prevents coordinated operation and can lead to system malfunction.

The configured grid voltage parameters do not match the capabilities or settings of the inverter's power stage. This mismatch prevents safe and proper grid-tied operation.

The configured grid frequency parameters do not match the capabilities or settings of the inverter's power stage. This mismatch prevents safe and proper grid-tied operation.

A malfunction has occurred in the inverter's anti-islanding protection mechanism. This critical safety function ensures the inverter disconnects from the grid during power outages to protect utility workers.

The internal grid connection relay is physically stuck or failing to operate correctly, preventing the inverter from safely connecting or disconnecting from the grid. Consequently, the inverter is not feeding any energy.

A fault has occurred in the data acquisition system responsible for recording internal measurement signals within the inverter. This can affect diagnostic capabilities and operational accuracy.

A fault has occurred specifically in the data acquisition system used to record the measuring signal for the insulation resistance test. This means the inverter cannot accurately perform or verify insulation diagnostics.

The internal voltage reference used by the Digital Signal Processor (DSP) is unstable or outside its specified operating range. This can lead to inaccurate measurements, unstable control, and overall system malfunction.

Corruption or failure has occurred within the data memory used by the Digital Signal Processor (DSP). This can lead to incorrect program execution and system instability.

A malfunction has been detected in the routine responsible for monitoring the injection of DC current into the AC grid. This is a safety and regulatory function to prevent harmful DC components from reaching the grid.

The AC power cable has been connected with reversed polarity, or the AC connector is inserted incorrectly. This is a wiring error that can prevent the inverter from operating safely and correctly.

The fuse protecting the solar module grounding circuit is faulty or blown, resulting in no detection of a proper solar module ground connection. This prevents the inverter from feeding energy due to safety concerns.

The sensor within the Residual Current Monitoring Unit (RCMU) is faulty. This prevents accurate monitoring of leakage currents, compromising a critical safety function.

An insulation fault has been detected in the connection between the solar modules and ground. This means there's an unintended electrical path from the DC side to ground, which is a safety hazard.

The internal supply voltage for the inverter's gate drivers, which control the power semiconductors, is too low. This can prevent the power stage from operating correctly or safely.

Internal PC boards within the inverter are found to be incompatible, typically after a component replacement. This prevents the inverter from feeding energy into the grid, requiring a firmware update for synchronization.

The initial setup process of the inverter was interrupted or not completed successfully. This prevents the inverter from feeding energy into the grid until the setup is properly restarted and finished.

The DC input voltage on the second Maximum Power Point (MPP) tracker string is outside the acceptable operating limits for the configured fixed voltage mode. This prevents the inverter from feeding energy into the grid.

The CAN (Controller Area Network) bus transmit buffer is full, indicating excessive data traffic or a communication error. This prevents the inverter from feeding energy into the grid due to communication breakdown.

An insulation error has been detected on the solar modules. This indicates a potential leakage path from the DC voltage to ground, triggering a warning message for safety.

The inverter has not fed any energy into the grid over the last 24-hour period, triggering a warning message. This indicates a prolonged period of non-operation or insufficient generation.

Communication has been lost with an internal or external filter component. This can affect power quality and lead to restrictions in energy feeding.

Communication has been lost with the connected energy storage unit. This prevents the inverter from coordinating with the battery system for charging or discharging.

The inverter's internal temperature has exceeded safe operating limits, causing it to automatically reduce its output power (power derating) to prevent damage. A warning message is displayed.