SMA Solar Technology AG
9 Setting the Insulation Monitoring of the PV System
User Manual
SCCP-JP-BA-A4-en-12
73
9.1.3 Switching to Grounded 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. Switch the GFDI circuit breaker on.
5. Close the Sunny Central.
6. Set the key switch on the Sunny Central to
Start
.
9.2 Setting the PV System to Insulation Monitoring with Remote GFDI and an
Insulation Monitoring Device
9.2.1 Information on Insulation Monitoring of the PV System with Remote GFDI
and an Insulation Monitoring Device
Ground-fault monitoring with Remote GFDI does not provide protection from injury.
The option "Remote GFDI and insulation monitoring device" allows the PV array to be switched automatically 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.
9.2.2 Switching to Insulated Operation
1. Set the parameter
RemMntSvc
to
On
(see Section 6.2 "Changing Parameters", page 40).
☑ 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).
2. 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.
9.2.3 Switching to Grounded Operation
• Set the parameter
RemMntSvc
to
Off
