SMA SC 500HE-20 - Manual (Page 70)

9 Insulation Monitoring SMA Solar Technology AG
70 SCxxxHE-20-BE-BEN111210 Operating Manual
The "GFDI and insulation monitoring" option allows you to manually switch the PV array from
grounded operation to insulated operation. To ensure that there is no insulation error on the grounded
pole, an insulation measurement is carried out. After switching to insulated operation, the insulation
monitoring device checks each pole of the PV array for potential insulation errors.
Switching to insulated operation is useful whenever you need to perform maintenance or service work
on or near the PV array (e.g. cutting the grass) or check the status of the insulation at regular intervals.
Switching PV Modules from Grounded to Insulated Operation
1. Turn the key switch on the inverter to "Stop".
2. Wait 10 minutes. This allows the capacitors to discharge.
3. Open the inverter.
4. Switch off the GFDI miniature circuit-breaker.
5. Close the inverter.
6. Turn the key switch on the inverter to "Start".
☑ The insulation monitoring device starts collecting data. The error "3505 ‒ ground fault
ignored" appears. This error indicates that the PV array is operating without a grounding
connection.
✖ Does the error message not go away?
The insulation is defective.
• Have the insulation checked and, if necessary, repaired by an electrically qualified
person.
• Reset the error.
Switching PV Modules from Insulated to Grounded Operation
1. Turn the key switch on the inverter to "Stop".
2. Wait 10 minutes. This allows the capacitors to discharge.
3. Open the inverter.
4. Switch on the GFDI miniature circuit-breaker.
5. Close the inverter.
6. Turn the key switch on the inverter to "Start".
☑ The inverter is running in grounded operation and the error "3505 ‒ ground fault ignored"
is no longer displayed.