📝 Description

Used product. Original ABB / Power-One electronic board, code 3L07-99-1 Pb-free, used inside centralized photovoltaic inverter modules of the Aurora Power-One PVI family. The PCB performs interface and control functions between the different electronic sections of the module, managing signals from measurement and control circuits and communications with the DSP and supervision system. Visible PCB connections are marked VSIN, DSP, and SUPERVISOR. The board includes integrated circuits, signal processing and conditioning sections, interface circuits, multipole connectors, and power supply circuitry.

⚙️ Main Specifications

• Brand: Power-One / ABB
• PCB Code: 3L07-99-1
• Marking: ABB – Pb-free
• Type: Interface and control electronic board
• Application: Aurora Power-One centralized photovoltaic inverters
• Connections: VSIN, DSP, SUPERVISOR
• Installation: Internal to the inverter module
• Technology: Industrial multi-component PCB
• Functions: Signal interface, control, supervision, and internal communication management
• Components: Integrated circuits, transformers/inductors, capacitors, driver circuits, optocouplers, and power supply circuitry

🔧 Main Functions

Depending on the module configuration, the board may provide:

• Interface between the electronic circuits of the module
• Management and conditioning of measurement signals
• Interfacing with the DSP
• Communication with the supervision system
• Management of signals from the power sections
• Distribution and management of command and control signals
• Interface between power circuits and low-voltage electronic circuits
• Support for monitoring the operating conditions of the module
  The presence of the DSP and SUPERVISOR connectors on the photographed board is particularly significant for these functions.

🔌 Purpose and Operation

The 3L07-99-1 constitutes an internal electronic interface of the Aurora Power-One module. Its purpose is to enable information exchange between the measurement, control, DSP, supervision, and internal module circuits.
When operating correctly, signals are acquired, conditioned, and transferred to the module control circuits. A fault in the board, its connectors, or the related power supplies may cause loss of communication or abnormal module operation.

🧩 Compatibility and Inverters

The 3L07 family is associated with Aurora Power-One centralized inverters.

• PVI50 – 3L07: 50 kW
• PVI55 – 3L07: 55 kW
  The board is compatible with Aurora Power-One PVI modules of the 3L07 family, mainly 50/55 kW configurations, subject to verification of the PCB code, revision, connectors, and module configuration.
  It should not be identified as a board specifically for 67 kW systems: the PVI Central HV 67 kW units are associated with codes 3M62 and 3M67.

⚠️ Typical Faults and Symptoms

A fault in the 3L07-99-1 may manifest as:

• Loss of communication between the electronics and DSP
• Module not being correctly recognized by the system
• Supervision anomalies
• Module lockup or failure to start
• Intermittent operation
• Loss or alteration of measurement signals
• Anomalies in control signals
• Errors persisting on the same module after restart
• Failure of certain internal electronic functions
  Warning: these symptoms do not automatically demonstrate that the 3L07-99-1 is faulty. Power supplies, wiring, connectors, DSP, connected boards, and the power section must also be checked.

🚨 Faults and Possible Errors

Several error codes are documented for centralized Aurora modules of the 3L07 family. However, they should not be considered codes specific to the 3L07-99-1 PCB.

E005 – DSP Communication Error

One of the codes most relevant to this board, as it is described as a communication error with the DSP. STI documentation indicates a possible internal module fault and suggests restarting and comparing/exchanging the module as part of the diagnostic procedure.

E004 – Bulk OV

Indicates an input voltage above the maximum threshold. It may be caused by the PV system or by an internal module fault.

E007 – OCH / IGBT SAT

May occur in the presence of grid disturbances or voltage dips, low irradiance, or an internal IGBT fault. If it recurs on the same module, further diagnosis is required.

E014 – Overtemperature

Associated with overtemperature, sensor problems, high ambient temperature, or clogged filters. It is therefore not a code specific to the 3L07-99-1.

E015 – Unbalanced Bulk

Indicates a voltage difference across the DC capacitors exceeding the threshold. The cause may be loss of insulation in the PV generator or an internal module problem.

E043 – Auto-Exclusion

The module may enter auto-exclusion after repeated faults. STI indicates E005, E007, E015, and E038 among the errors that may lead to E043.
Important: these codes belong to the module/inverter diagnostic system and are not exclusive error codes of the 3L07-99-1 PCB.

🛠️ Common Services in Case of Failure

For a PCB of this type, the following services may normally be performed:

• Electronic board diagnostics
• Power supply checks
• Verification of internal voltages
• Inspection of connectors and solder joints
• Verification of communication sections
• Inspection of DSP interface circuits
• Verification of isolation and conditioning circuits
• Inspection of electronic components
• Replacement of damaged components
• Repair of damaged traces or deteriorated solder joints
• Treatment and restoration of areas affected by oxidation
• Technical PCB cleaning
• Functional testing
• Replacement with a compatible board
  Professional maintenance of Power-One/ABB modules includes inspection of boards, flat cables and connectors, cleaning, checking circuits subject to oxidation, and functional testing under power.

🛠️ Recommended Diagnostics

Before replacing the board, it is recommended to:

1. Verify the module power supplies
2. Check connectors and flat cables
3. Verify the DSP connection
4. Check the connection to the supervision system
5. Read the fault log through Aurora CVI Central
6. Verify whether the error remains associated with the same module
7. Where possible, compare operation with another module in the same rack
   The module comparison/exchange procedure is also indicated in STI documentation to distinguish an internal module problem from an external problem.

🛠️ Applications

• Repair of centralized ABB / Power-One Aurora inverters
• Maintenance of PVI Central modules
• Replacement of damaged PCBs
• Restoration of 3L07 modules
• Spare parts for industrial photovoltaic systems
• Electronic refurbishment and reconditioning

💡 Advantages

• Original ABB / Power-One spare part
• Clearly identifiable 3L07-99-1 PCB code
• Dedicated to the Aurora Power-One architecture
• Integrates numerous interface and control functions
• Allows replacement of the PCB alone without necessarily replacing the entire module
• Suitable for repair, maintenance, and refurbishment activities

🛡️ Product Condition

Used board, as shown in the photographs. The PCB has normal signs of use and superficial wear consistent with a component recovered from industrial equipment.
Functional status must correspond to the actual testing performed; it should not be described as tested without verification on a compatible inverter or test bench.

📦 Package Contents

• 1 × ABB / Power-One electronic board
• Code: 3L07-99-1
• PCB as shown in the photographs
• Connectors present on the board as shown in the images

🟢 Summary

The ABB / Power-One 3L07-99-1 is an internal interface and control board for Aurora Power-One centralized inverter modules of the 3L07 family, associated with 50/55 kW configurations. It interfaces with VSIN, DSP, and SUPERVISOR sections and contributes to signal management, communications, and module control functions.
Among the module anomalies, E005 – DSP Communication Error is particularly relevant, together with E004, E007, E014, and E015. These codes must be interpreted as module diagnostic indications, not as automatic proof of failure of the 3L07-99-1.