Siemens SINVERT 350 Maximum Power Point LED MPP, Standby operation LED Standby, Fault display

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Hardware operation

3.2 Operating the inverter

Maximum Power Point (LED "MPP")

The power which can be generated by a PV system depends on the level of insolation and the temperature of the PV modules. The inverter control unit is equipped with a "Tracker" which automatically tracks the MPP (Maximum Power Point) of the PV field in Automatic mode. As soon as the inverter tracker has found the MPP, the LED "MPP" lights up.

A flashing "MPP" LED indicates throttling of the inverter due to overtemperature of the cooling element.

Standby operation (LED "STANDBY")

The LED "STANDBY" lights up if the power unit of the inverter is switched off, but the control electronics and control panel are switched on (for example, if the PV field output is not sufficient to compensate for the losses, or if the inverter has been switched off manually). The AC contactor is open, and the DC contactors are open, closed or switching between these two states (in order to check whether sufficient voltage/output is available to start operation).

Automatic mode / Test mode

The LEDs "AUTO" and "TEST" indicate the current operating mode of the inverter.

Line (grid) status (LED "LINE OK")

The inverter is equipped with a monitoring unit for the three-phase AC grid. This can detect grid faults or failures. If a fault is detected, the inverter shuts the system down to prevent the regeneration of hazardous voltages to the grid. The LED "LINE OK" indicates that the grid voltage and frequency are within the programmed limit values.

3.2.10 Fault display

If malfunctions in the PV installation develop which affect only certain parts of the system and do not prevent it from regenerating energy to the grid, operation continues and the inverter triggers an alarm. If a malfunction develops which affects the entire system, the inverter is switched off with a fault message. The LED "ALARM" flashes to indicate an alarm.

The LED "FAULT" lights up steadily to indicate a fault.

3.2.11 Numerical display

In Automatic mode, the output of the whole PV system as a percentage of rated output is shown on the two-digit display. If the output is more than 99%, a value of "00" is displayed. At the same time, the LED ">100%" lights up in the grid indicator bar.

In Test mode, the two-digit display shows the first two digits of the set DC voltage value (for example, 55 represents a voltage of 550 V DC).

Codes for malfunctions

In the event of a fault or alarm (in Test or Automatic mode), a corresponding code appears on the display. The meaning of these codes can be found in table 4-1. The code will remain displayed until the operator resets the alarm or fault by means of the keyswitch.

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Contents Sinvert Photovoltaic Safety instructions Qualified personnelProper handling TrademarksContents Tables FiguresAbout this documentation IntroductionScope of validity Chapter Contents Target groupDocument structure HistoryDescription ApplicationInstructions and safety information Five safety rules in GermanyHardware operation Commissioning the inverterSwitching off and disconnecting the power supply Switching on Operating the inverter Operator panelPin Signal Switching the inverter on and off Operating modeLocal/Remote selector switch Fault reset Displaying currently active alarms and faultsAdjusting the voltage Grid LED indicator barMaximum Power Point LED MPP Automatic mode / Test modeFault display Standby operation LED StandbyCommunication with the inverter 1 WEB’logWinCC PPsolarRed System components are malfunctioning Control Panel PPsolar Oscilloscope function PPsolar SINVERT-Settings Device InformationActual Value Summary Actual valuesPV Generator Weather conditionsMains Interface Energy Data Storage PPsolar10 Analysis window PPsolar Alarm and fault messages Fault handlingFault types Fault display / messagesMeaning Category Alarm and fault messagesMain cause LED Faults Causes/diagnostics/remedial measures Differences in potential in the PV fieldCauses DiagnosticsMeasures Fault in measured-value sensing ConditionCauses Cooling system is not working properly Heat generation is exceeding toleranceCauses Inlet air temperature too high Causes No power supply for Fast OFF No checkback signal from the AC contactorCauses Measured DC voltage is too high Causes No line voltage for Fast OFF13 Fault Alarm Vce monitor has responded 16 Fault Alarm Direct current too high Causes Contact in the signaling circuit is open Possible Remedial24 Fault Alarm Grid voltage outside tolerance Alarm without fault Support Contact addressesGermany
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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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