SMA ST6-US - Manual (Page 49)

SMA America, LLC Commissioning the Sunny Tower
Installation Guide ST36-48US-IA-IUS112321 49
9 Commissioning the Sunny Tower
Requirements for the initial start-up
1. Check the AC main connection inside the Sunny Tower for a clockwise rotating field.
– Use a rotating field instrument for checking.
2. Proceed with commissioning the Sunny Tower only after:
– The housing covers on the SB 6000US/SB 7000US/SB 8000US inverters are closed.
– The DC cables are connected correctly.
– The AC cable is connected correctly.
– All conduit fittings are secured.
3. Verify the functionality of the AC/DC disconnect. Operate each AC/DC disconnect for
10 times as follows:
– Turn from position “0“ (off) to position “1“ (on).
– Turn back from position “1“ (on) to position “0“ (off).
4. Switch on the breaker of the AC distribution panel, connecting the Sunny Tower to the grid.
5. Verify the correct voltage range at the grid connection terminals, 208 V, 240 V or 277 V/
480 V. See section 7.2 for details.
NOTICE
Risk of overvoltage.
Damage to connected PV-modules and fuses will result.
• Ensure the correct polarity of each DC cable connected to the Sunny Tower.
• Ensure the correct DC fuse size regarding the grid configuration.