SMA SB 240 User Manual
Page 62
Procedure:
1. Make sure that no terminal of the PV module is grounded.
2. Use Sunny Portal or Sunny Explorer to determine which of the connected inverters has a
3.
Risk of electric shock due to high voltages
• Disconnect the affected inverter from all voltage sources (see Section 9, page 48).
4. Measure voltages with a suitable measuring device.
• Measure the voltages between the positive terminal and the ground potential.
• Measure the voltages between the negative terminal and the ground potential.
• Measure the voltages between the positive and negative terminals.
If the following results are present at the same time, there is a ground fault in the PV
system:
– All measured voltages are stable.
– The sum of the two voltages to ground potential is approximately equal to the
voltage between the positive and negative terminals.
5. In case of a ground fault, solve the problem and recommission the inverter (see Section 12,
6. If there is no ground fault and the error persists, contact the SMA Service Line.
11 Troubleshooting
SMA Solar Technology AG
Installation Manual
SMA-SB240-IA-en-12
62