SMA TCS 500-SC - Manual (Page 28)

8 Commissioning SMA Solar Technology AG
28 TCS-IT-IEN103610 Installation Manual
8.2 Inspecting Cabling to the Transformer Compact Station
1. Verify that all connections are connected as described in the circuit diagram.
2. Verify that all terminals are firmly in place.
3. Check the Transformer Compact Station's equipotential bonding to the installation site. Bond
them together if needed.
8.3 Examining Low AC Voltage in Low-Voltage Switchgear
1. Check the phase sequence of the low voltage. Correct if necessary.
2. Measure the low voltage difference between the line conductors and log it in the commissioning
report.
– L
1
- L
2
– L
1
- L
3
– L
2
- L
3
☑ The low voltage is within ± 5 V of the nominal voltage of the inverter.
✖ Does the low voltage vary from the nominal voltage of the inverter by more than ± 5 V?
• De-energize the medium-voltage transformer.
• Have a duly authorized person change the turns ratio of the medium-voltage transformer by
adjusting the on-load tap-changer.
☑ The on-load tap-changer will audibly click into place.
• Proceed to step 2.
8.4 Connecting the Internal Power Supply for the Transformer
Compact Station
1. Insert the fuses in the fuse-switch-disconnector.
2. Close the fuse-switch-disconnector.
L3
L2
L1