9 Setting the Insulation Monitoring of the PV System
SMA Solar Technology AG
72
SCCP-JP-BA-A4-en-12
User Manual
9 Setting the Insulation Monitoring of the PV System
9.1 Setting the PV System to Insulation Monitoring with GFDI and an
Insulation Monitoring Device
9.1.1 Safety during Insulation Monitoring of the PV System with GFDI and an
Insulation Monitoring Device
Ground-fault monitoring with GFDI does not provide protection from personal injury.
The option "GFDI and insulation monitoring device" 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 terminal, an insulation measurement is
carried out. After switching to insulated operation, the insulation monitoring device checks each terminal of the PV array
for potential insulation errors.
Switching to insulated operation is useful for performing maintenance or service work on or near the PV array (e.g. cutting
the grass) or for checking the status of the insulation at regular intervals. After completion of the maintenance work,
the PV system should be switched back to grounded operation.
9.1.2 Switching to Insulated Operation
1. Set the key switch on the Sunny Central to
Stop
.
2. Wait 15 minutes before opening the Sunny Central. This will ensure that the capacitors are discharged.
3. Open the Sunny Central.
4. Manually switch the GFDI circuit breaker off.
5. Close the Sunny Central.
6. Set the key switch on the Sunny Central to
Start
.
☑ The insulation monitoring device starts collecting data. When the parameter
IsoErrIgn
is set to
On
, the error
3504 - Insulation error ignored
is displayed.
✖ The displayed error
3504
has not disappeared after approximately 15 minutes?
The insulation is defective.
• Have the insulation checked and, if necessary, repaired by a qualified person.
• Acknowledge the error (see Section 10.3, page 75).
7. Wait a few minutes and then display the instantaneous value
Riso
on the user interface (see Section 6.1, page 40).
☑ The insulation resistance is greater than 45 k Ω . It is safe to enter the PV system.
✖ The insulation resistance is less than 45 k Ω ?
There is an insulation error and you must not enter the PV system.
• Have the insulation checked and, if necessary, repaired by a qualified person.
'$1*(5
Danger to life from electric shock due to live voltage
The components in the Sunny Central carry live voltage. Touching live components will result in death or serious injury.
• Switch the Sunny Central off.
• After switching the Sunny Central off, wait 15 minutes before opening the Sunny Central. This will ensure that the
capacitors are discharged.
• Do not touch any live components.
• Wear personal protective equipment.
