SMA SC 500CP XT - Manual (Page 31)

4.3.6 Checking the Connectors
Test Point Tasks
Connectors on the CAN bus Ensure that all connectors are securely in place.
Connectors on the SC20cont
Connectors on the inverter bridge
Connectors on the communication unit
Connectors on the hub
Connectors on the router
4.4 Connection and Measurement
4.4.1 Sequence for Connection and Measurement
1. Use the tap changer on the MV transformer to adjust the voltage of the utility grid (see documentation of the MV
transformer).
2. Switch the transformer field and the ring circuit of the medium-voltage switchgear on (see documentation of the
medium-voltage switchgear).
3. Measure the voltages on the primary and secondary sides of the MV transformer and record the values in the
commissioning report.
4. Ensure that the supply voltage is within the permissible voltage range of the inverter of −10% to +15%.
5. Check the output voltage of the inverter (see Section 4.4.2, page 31).
6. Check the DC voltage (see Section 4.4.3, page 32).
7. Mount the protective covers (see Section 9.1.2, page 80).
8. Mount the panels (see Section 9.1.1, page 79).
9. Switch on the supply voltage and the AC disconnection unit (see Section 4.4.4, page 32).
4.4.2 Checking the Output Voltage of the Inverter
1. Use a rotating field instrument to measure whether a right-hand rotating magnetic field is connected at the AC
connection brackets.
If a left-hand rotating magnetic field is detected, two line conductors must have been wrongly connected.
• Swap the connections L1 and L3.
2. Check whether the AC voltage is approximately the same as the nominal voltage of the inverter. Measure the AC
voltage between the terminals at the AC connection brackets and record in the commissioning report.
If the AC voltage differs significantly from the nominal voltage of the inverter, the transformation ratio of the MV
transformer must be adjusted by a duly authorized person.
4 Commissioning SMA Solar Technology AG
User Manual 31 SCCPXT-BA-E4-en-54