Alarm and fault messages

4.2 Alarm and fault messages

4.2.1Faults – Causes/diagnostics/remedial measures

First acknowledge the fault with the keyswitch on the control panel.

Check the following if the inverter has not been in operation:

•Polarity of the PV field input

•Polarity of the DC link connection

•AC phase sequence

•AC voltage (phase-phase, phase-N)

Check the following if the inverter has been in operation:

•Is the Fast Stop button in the locked position?

•Is the external power supply available?

•Is the control voltage (24 V DC) present at the relevant terminals?

•Is the grid voltage within tolerance?

•Have fuses blown or have automatic fuses tripped? If yes, find the cause of the problem.

If none of the reasons above is the source of the fault, it may have been caused by a problem on the control unit.

If a CU printed circuit board is defective, it must be replaced with a new one. Never install a CU in a different device to check whether it is defective or not.

This could cause very serious damage to the other device.

(Read out and check all CU parameters.) (Read out and check the S7 HW Config.)

Differences in potential in the PV field

If a PV system is not yielding the required output, the problem could indicate a difference in potential. This means that there is a difference in voltage between the field segments. Because the field segments are connected in parallel, an average voltage value is supplied under these conditions and this means in turn that the field segments are not operating at the MPP.

To identify this type of fault, measure the no-load voltage and the MPP voltage at the inverter inputs and compare the measured values. A deviation of more than 10 V is an effective difference in potential which will cause a reduction in output.

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Siemens SINVERT 350 manual Faults Causes/diagnostics/remedial measures, Differences in potential in the PV field
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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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