Hardware operation

3.2 Operating the inverter

3.2.2Operating mode

You can choose between modes "Automatic" and "Test".

In Test mode, you can adjust the DC voltage manually. In Automatic mode, the inverter determines the Maximum Power Point (MPP) automatically. It also displays currently active fault messages.

To select Test mode, turn the keyswitch to the "TEST" position. To select Automatic mode, turn the keyswitch to the "AUTO" position.

3.2.3Switching the inverter on and off

The inverter switches on and off automatically in AUTO mode. Manual switching on and off is possible in both TEST mode and AUTO mode.

The control electronics and control panel of the inverter are switched off temporarily in order to save energy. When the inverter is in this state, it cannot be operated via the panel. However, you can switch on the control electronics and control panel for maintenance and commissioning purposes. To do so, open the cabinet door and press the Fast ON button inside the inverter. Once you have switched on the panel, you can switch the inverter on and off as described below.

To switch off the inverter during operation, briefly press the OFF button on the operator panel (less than 3 seconds).

To switch on the inverter, briefly press the OFF button on the operator panel (less than 3 seconds) in TEST mode.

3.2.4Local/Remote selector switch

If the selector switch is set to Local, errors can only be acknowledged locally and the inverter can be started manually. Remote access is blocked in this switch position.

In the Remote position, errors can also be acknowledged and the inverter started by a plant monitoring system (such as WinCC). In this position, the inverter can also be operated locally and started manually.

Figure 3-3 Fast ON button and local/remote selector switch

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Siemens SINVERT 350 manual Operating mode, Switching the inverter on and off, Local/Remote selector switch
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350, SINVERT 350 specifications

The Siemens SINVERT 350 series is a high-performance, lightweight inverter system designed to optimize energy conversion in solar power applications. With a power rating of up to 350 kW, this inverter model is tailored for large-scale photovoltaic installations and commercial applications. Its key features and technological innovations make it a valuable addition to any renewable energy project.

One of the main features of the SINVERT 350 is its advanced grid management capability. The inverter is equipped with sophisticated monitoring systems that ensure compliance with various grid connection standards, enhancing stability and reliability for the operator. This ensures seamless integration with existing power grids while optimizing energy yield. Additionally, it supports various grid support functionalities, helping maintain grid stability during high-demand periods.

Another notable characteristic is its modular design. The SINVERT 350 allows for easy integration with other units, scaling effectively to meet the power needs of larger installations. This modularity not only enhances flexibility but also simplifies maintenance and reduces operational costs over time. Each unit can be easily accessed, which minimizes downtime during servicing.

The SINVERT 350 also features advanced cooling technology. With its robust thermal management system, the inverter operates efficiently even under high temperatures, ensuring longevity and reliability. The design minimizes losses due to heat, effectively enhancing the overall energy conversion efficiency.

In terms of safety, the SINVERT 350 is built with integrated protection mechanisms, including over-voltage and short-circuit protections. These safety features safeguard both the inverter and the connected photovoltaic modules, ensuring a secure operating environment.

Another highlight is the inverter’s compatibility with the Siemens Smart Grid solutions. This integration means users can access comprehensive monitoring and analytics tools, enabling real-time performance tracking and optimization of energy output. With built-in web-based connectivity, operators can manage the system remotely, gaining insights and facilitating proactive maintenance.

In conclusion, the Siemens SINVERT 350 series combines robust performance, innovative technologies, and reliable safety features to create a compelling choice for large-scale solar energy projects. Its advanced design ensures operational efficiency and adaptability, thereby enhancing the overall viability of solar energy as a sustainable power source.
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