📝 Description
Used and tested product. Original Fronius IG-BRAIN electronic board, part number 4.071.082, revision V1.5B, designed for the logic management and operational control of compatible Fronius photovoltaic inverters.
This board serves as the inverter's processing and control unit: it manages operating logic, processes information from internal circuits, coordinates monitoring functions, and supports diagnostic notifications.
The component is listed as a spare part for the Fronius IG Plus 120 V-3 photovoltaic inverter. Compatibility must be verified by comparing the board code, hardware revision, and inverter configuration.
Identification is based on the label visible in the photograph, which shows code 4.071.082, the designation IG-BRAIN, and revision V1.5B D R.
⚙️ Main Specifications
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Manufacturer: Fronius International GmbH
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Designation: IG-BRAIN
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Part number: 4.071.082
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Hardware revision: V1.5B D R
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Type: Logic control board
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Reference application: Fronius IG Plus 120 V-3 photovoltaic inverter
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Function: Processing and management of the inverter's operating logic
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LED indicators: POWER and STATUS
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Connections: Multipole connectors for connection to the internal electronics
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Installation: Inside the inverter
🔧 Main Functions
- Management of inverter operating logic.
- Processing of signals from internal circuits.
- Coordination of startup and operating sequences.
- Monitoring of the equipment's operating status.
- Management of diagnostic information and error notifications.
- Interface with the inverter's other electronic boards.
- Support for system control and monitoring functions.
🔌 Purpose and Operation
The IG-BRAIN board serves as the inverter's logic control unit. It processes information received from measurement and monitoring circuits and coordinates equipment operation according to its operating conditions.
The two indicators on the board provide information about certain operating states:
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POWER: Indicator showing whether power is supplied to the board.
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STATUS: Operating-status indicator, to be interpreted according to Fronius technical documentation.
The board operates together with the inverter's other electronic circuits and should not be confused with a power board or a simple communication board.
🧩 Compatibility
Reference inverter:
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Fronius IG Plus 120 V-3
Compatibility with other models in the Fronius IG Plus family must be verified according to the spare-part code and hardware revision.
Before purchasing, it is advisable to compare:
- Original board code: 4.071.082.
- Revision: V1.5B D R.
- Complete inverter model.
- Connector configuration and version of the installed electronics.
For final verification, consult the technical documentation in the inverter section of the official Fronius website.
⚠️ Possible Faults and Associated Symptoms
A malfunction of the control board may be associated with:
- The inverter failing to complete its startup sequence.
- Abnormal shutdowns or restarts.
- Persistent error messages.
- Irregular communication between internal circuits.
- Inconsistent operating behavior.
Warning: These symptoms do not automatically establish that the IG-BRAIN board is the cause. Before replacement, power supplies, wiring, sensors, and power circuits must also be checked.
🔍 Diagnosis
Before replacing the board, it is advisable to:
- Check the power supplies according to the manufacturer's specifications.
- Inspect connectors and wiring.
- Check any inverter error codes.
- Check the POWER and STATUS indicators according to the technical manual.
- Compare the code and revision of the installed board with those of the replacement.
🛠️ Applications
- Repair of compatible Fronius photovoltaic inverters.
- Replacement of defective logic boards.
- Maintenance of control electronics.
- Restoration of inverter monitoring and management functions.
- Technical servicing of photovoltaic systems equipped with Fronius IG Plus inverters.
🛡️ Product Condition
Used electronic board, with components and connectors visible in the photographs.
Identification is based on the markings on the label.
📦 Package Contents
- 1 × Fronius IG-BRAIN electronic board.
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Part number: 4.071.082.
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Hardware revision: V1.5B D R.
- Components and connectors as shown in the photographs.
🟢 Summary
Original Fronius IG-BRAIN 4.071.082 V1.5B logic board, listed as a spare part for the Fronius IG Plus 120 V-3 photovoltaic inverter.
The unit manages the inverter's logic and control functions, coordinates internal operations, and supports monitoring of operating status. It is intended for maintenance and repair, subject to verification of compatibility with the exact model.
Safety Warning: Installation and replacement must be carried out by qualified personnel, with the inverter completely disconnected from the power supply and in accordance with the manufacturer's procedures.
