Connecting the Measuring Cables of the Automatic Transfer Switch
Qualified person
The Sunny Island measures the voltages of the respective line conductors via one measuring cable. In addition, the master measures whether the tie switch has activated or deactivated (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:
- Lay the control and measuring cables at the greatest possible distance from the power cables.
- Use shielded cables for the control and measuring cables.
- Always connect the digital input DigIn of the Sunny Island separately via a shielded cable.
Procedure:
- On the Sunny Island, connect the measuring cable X4 Ln (Ln = L1 to L3) and X4 N for voltage monitoring to the ExtVtg terminal ( > Connecting ExtVtg).
- At the master, connect the tie switch monitoring( > Connecting BatVtgOut, DigIn, BatTMP and BatCur).
Connect the master BatVtgOut- with the DigIn-.
Thread both insulated conductors through a ferrite included in the scope of delivery.
Connect the insulated conductor from X5 3 to DigIn+.
Connect the insulated conductor from X5 4 to BatVtgOut+.