SMA SC 500HE-20 Installation - Manual (Page 60)

12 Commissioning SMA Solar Technology AG
60 SCxxxHE-20-IA-IEN111210 Installation Manual
12.3.2 Checking the AC Grid Voltage
1. Measure the rotating magnetic field at the the AC terminal lugs using a rotating-field instrument.
☑ The detected rotating magnetic field is right-rotating.
✖ Is the detected rotating magnetic field left-rotating?
2 line conductors are incorrectly connected.
• Swap over the connections of the two of the three line conductors.
2. Measure the AC voltage at the AC terminal lugs between the following terminals and record in
the Commissioning Report:
– L
1
- L
2
– L
1
- L
3
– L
2
- L
3
– L
1
- PE
– L
2
- PE
– L
3
- PE
☑ AC voltage is approximately the same as the nominal voltage of the inverter.
✖ Does the AC voltage strongly deviate from the nominal voltage of the inverter?
• Have the transmission ratio of the medium-voltage transformer adjusted by an authorized
person.