Connecting the AC Power Cables of the Automatic Transfer Switch
Qualified person
The AC power cables conduct the energy between the battery-backup grid and the Sunny Island (see circuitry overview in the quick reference guide "SMA FLEXIBLE STORAGE SYSTEM with Battery-Backup Function").
Requirements:
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With each three-phase cluster, the connection of the line conductor must be prepared as follows: L1 to the master, L2 to slave 1 and L3 to slave 2. This results in a right-hand rotating magnetic field.
The power of the AC sources in the battery backup grid must not exceed the maximum connected power of the PV inverters in the battery backup systems ( > AC2 Connection for Utility Grid and Generator (External Energy Source)). The powers of the individual Sunny Island inverters are added to yield the total maximum power.
Procedure:
- Connect the power cable from X3 on the automatic transfer switch to the terminals AC2 Gen/Grid on the Sunny Island. When doing so, connect the line conductor to AC2 Gen/Grid L and the neutral conductor to AC2 Gen/Grid NTT ( > Connecting the AC Power Cable). Thread the grounding conductor through a ferrite included in the scope of delivery and connect to AC2 Gen/Grid PE ( > Connecting the Grounding Conductor).