Connecting the Control Cables of the Automatic Transfer Switch

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Control cables conduct the control signals of the multifunction relays to the contactors (see circuitry overview in the quick reference guide "SMA FLEXIBLE STORAGE SYSTEM with Battery-Backup Function").

Cable route for control cables and measuring cables in the automatic transfer switch

An unfavorable cable route can lead to quality losses during the transmission of control signals and measured values Observe the following rules for cable routes:

  1. Lay the control and measuring cables at the greatest possible distance from the power cables.
  2. Use shielded cables for the control and measuring cables.
  3. Always connect the digital input DigIn of the Sunny Island separately via a shielded cable.

Procedure:

  1. On the master, connect the cable from X5 L and X5 N (for the control voltage) to terminal AC1 Loads/SunnyBoys ( > Connecting the AC Power Cable).

  2. WARNING

    Danger to life from electric shock due to incorrect insulation

    In the case of faulty insulation, supposedly de-energized parts or cables may be live. Touching live components or cables can result in death or serious injury due to electric shock.

    1. When making the following connections, always insert a silicone tube ( > Connecting Relay 1 and Relay 2).
  3. Connect the control cable from X4 1 and X4 2 to the connections Relay1 C and Relay1 NC.
  4. Connect the control cable from X5 1 and X5 2 to the connections Relay2 C and Relay1 NO.
Connecting the AC Power Cables of the Automatic Transfer Switch
Connecting the Measuring Cables of the Automatic Transfer Switch