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SMA Solar Technology SUNNY CENTRAL Technical Information

Pv generator
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Technical Information
SUNNY CENTRAL
Notes for grounded operation of the PV generator
1  Introduction
Some module manufacturers recommend or require positive or negative grounding of the PV generator when
using thin-film and back-contact PV modules. In this case, the positive or negative pole of the generator output
is grounded, regardless of the grounding of the module frame.
In case of the Sunny Central with the "GFDI negative ground" or "GFDI positive ground" insulation monitoring
option, the grounding takes place within the device. The inverters are adapted for grounded operation of the
PV generator. The connection to ground is established using a fuse, the GFDI (ground fault detection
interruption).
This technical information complements the user manual and the installation guide for standard devices from
the Sunny Central product range with important instructions and information on grounded operation.
SC-HEM-UEN083710
Version 1.0
1/12

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Summary of Contents for SMA Solar Technology SUNNY CENTRAL

  • Page 1 In case of the Sunny Central with the "GFDI negative ground" or "GFDI positive ground" insulation monitoring option, the grounding takes place within the device. The inverters are adapted for grounded operation of the PV generator.
  • Page 2 PV generator or in the distributor boxes is not permissible. • Only in the Sunny Central 500 / 560HE is the grounding of the PV generator interrupted by the DC main switch in the event of a "Stop" switch position, or a grid failure.
  • Page 3 Notes for Grounded Operation 2.1 GFDI The GFDI is installed in the Sunny Central and connected between an input busbar and the PE bar. The GFDI consists of a high-performance circuit breaker equipped with an adjustable triggering current with K characteristics.
  • Page 4 The triggering of the GFDI is signaled by an indicator light, a relay output, and the display on the device. The signal occurs as a common fault, i.e. it can involve different fault causes. Please refer to the Sunny Central user manual for the overview of the possible faults.
  • Page 5 Technical Information Grounded Operation Figure 1: Ground fault L+ (negative pole grounded) SMA Solar Technology AG 5/12...
  • Page 6 Technical Information Grounded Operation Figure 2: Ground fault on both sides SMA Solar Technology AG 6/12...
  • Page 7 ‒ If there is a poor connection through the electric bonding to the grounding of the GFDI, these currents can also flow through system components or the soil. This can damage the system and building components. SMA Solar Technology AG 7/12...
  • Page 8 Technical Information Grounded Operation Figure 3: Ground fault in the grounded pole during operation SMA Solar Technology AG 8/12...

  • Page 9: System Requirements

    4  System Requirements The system requirements that are required for operating a GFDI are described below: • The PV generator is centrally grounded in the Sunny Central. Additional grounding within the system is not permissible. • Both poles must be installed with protection against short-circuits and ground faults.
  • Page 10 5.1 GFDI in the Sunny Central 500 / 560HE Due to the two DC inputs, the GFDI is installed behind the main switch in the Sunny Central 500 / 560HE. This means that in "Stop" mode, in case of faults or in the event of a grid failure, the grounding of the PV generator is interrupted by the main switch.
  • Page 11 5.3 GFDI Signaling If the GFDI is triggered, this causes the Sunny Central to be deactivated. The Sunny Central switches to "Failure" mode. The power module's quick-stop is activated, and the DC switch, the Team contactor, and the AC grid contactor are switched off.

  • Page 12: Servicing And Maintenance

    6  Servicing and Maintenance Additional servicing and maintenance instructions In order to maximize the operating safety of the Sunny Central, the maintenance work listed in the Sunny Central user manual and the maintenance manual must be performed at regular intervals. This facilitates early detection of defective system components and their exchange before a failure occurs.