Connecting the switch and outlet for secure power supply operation


Qualified person

Neutral and grounding conductor of output for secure power supply permanently connected

The inverter's output for secure power supply includes a permanent connection between neutral and grounding conductor, which cannot be disconnected.

Do not connect loads that require a stable electricity supply to the outlet for secure power supply operation.

Secure power supply operation must not be used for loads that require a stable electricity supply. The power available during secure power supply operation depends on the solar irradiation on the PV system. Therefore, power output can fluctuate considerably depending on the weather or may not be available at all.

  1. Do not connect loads to the outlet for secure power supply operation if they are dependent on a stable electricity supply for reliable operation.

Requirements:

  • The technical requirements for connecting the switch and outlet for secure power supply operation must be metTechnical Data).

Residual-current device:

  • SMA Solar Technology AG recommends installing a residual-current device (type A) between the inverter's output for secure power supply and the outlet for secure power supply operation, which trips at a residual current of 30 mA. Observe all locally applicable standards and directives when doing so.

Additionally required material (not included in the scope of delivery):

  • One standard outlet

  • One standard switch (e.g. light switch)

Procedure:

  • Connect the outlet for secure power supply operation

  • Connecting the switch for secure power supply operation

Connect the outlet for secure power supply operation

Requirements for the conductors:

  • Conductor type: copper wire

  • The conductors must be made of solid wire, stranded wire or fine stranded wire. When using fine stranded wire, bootlace ferrules must be used.

  • Conductor cross-section: 2.5 mm² to 4 mm²

  • Maximum length of conductors: 10 m

Procedure:

  1. DANGER

    Danger to life due to high voltages

    1. Ensure that the inverter is disconnected from all voltage sources Disconnecting the Inverter from Voltage Sources).
  2. Remove the sealing plug from the enclosure opening for connecting the outlet for secure power supply operation.
  3. Insert the cable gland into the opening and tighten it with the counter nut from the inside.
  4. Guide the conductors into the inverter.
  5. Connect the outlet's grounding conductor to a grounding point for secure power supply operation:
    • Strip off the conductor insulation by 18 mm.

    • 1717134860
    • Insert the screw through the conical spring washer, the clamping bracket and the washer.

    • Guide the conductor between the washer and clamping bracket and tighten the screw (TX 25) (torque: 6 Nm ± 0.3 Nm).

    1642668684
  6. Plug the terminal block for connecting the outlet for secure power supply operation into the SPS slot in the inverter and tighten it with a flat-blade screwdriver (blade width: 3.5 mm (0.14 in)).
  7. Ensure that the terminal block is securely in place.
  8. Strip off the conductor insulation by max. 15 mm.
  9. In the case of finely stranded wire, provide the conductors L and N with a bootlace ferrule.
  10. Connection of conductors of finely stranded wire

    To connect conductors made of finely stranded wire, each terminal point must be opened.

    1. First insert the conductor into the terminal point all the way to the lock (round opening). Then insert a flat-blade screwdriver (blade: 3.5 mm) as far as it can go into the actuation shaft (rectangular opening). Hereby the lock opens and the conductor can be placed into the terminal point as far as possible. After the connection has been made, the flat-blade screwdriver must be pulled out of the actuation shaft.
  11. WARNING

    Fire hazard due to faulty conductor connection

    If the conductors are inserted into the actuation shafts (right-angled openings), a fire may occur during inverter commissioning.

    1642669068
  12. Connect the conductors L and N to the terminal block in accordance with the labeling. Insert each conductor into the corresponding terminal point (round opening) up to the stop.
  13. 2128638348
  14. Ensure the conductors are plugged into the terminal points (round openings) as far as is will go and not into the actuation shafts (rectangular openings).
  15. Ensure that the terminal points are allocated to the correct conductors.
  16. Ensure that the conductors are plugged completely into the terminal points up to their insulation.
  17. Install outlet in desired position (e.g. next to the inverter or as switch/outlet combination optionally at short distance from the inverter (to max. 10 m)).
  18. Connect the other end of the cable using it directly as energy supply to the outlet.

Connect the switch for secure power supply operation

The switch for secure power supply operation must be connected to the Rooftop Communication Kit module (not the inverter) when using TS4-O module technology components.

When using TS4-O, secure power supply operation is only available if an external rapid shutdown initiator and the switch for secure power supply operation are connected to the Rooftop Communication Kit module. The switch for secure power supply operation must be connected to the module in series with a voltage supply of 18 V (e.g. two 9 V batteries). If an external rapid-shutdown initiator is used, the AC miniature circuit breaker is no longer the rapid-shutdown initiator in the system.

Connection overview

Requirements for the conductors:

  • Conductor cross-section: 0.2 mm² to 2.5 mm²

  • The conductor type and wiring method must be appropriate for the application and location.

  • Maximum length of conductors: 10 m

Procedure:

  1. Remove the sealing plug from the opening for connecting the switch for secure power supply operation.
  2. Insert the cable gland into the opening and tighten it with the counter nut from the inside.
  3. Guide the conductors into the inverter.
  4. Strip off the conductor insulation by min. 6 mm to max. 10 mm.
  5. 3010566284
  6. Connect the conductors to the 2-pole terminal blocks. Ensure that the conductors are plugged completely into the terminal points up to their insulation.
  7. 3010566668
  8. Stick the terminal block into the slot on the battery interface module in the inverter.
  9. Ensure that the terminal block is securely in place.
  10. Ensure that all conductors are correctly connected.
  11. Ensure that the conductors sit securely in the terminal points. Tip: To release the conductors from the terminal block, open the terminal points using a suitable tool.
  12. Install switch in desired position (e.g. next to the inverter or as switch/outlet combination optionally at short distance from the inverter (to max. 10 m)).
  13. Connect the other end of the cable directly to the switch.