10 Maintenance
SMA Solar Technology AG
Operating manual
NA-BOX-12-3-20-BE-en-12
30
• Disconnect the NA-Box and multicluster system from voltage sources (see Section 8, page 23)
• Contact the Service (see Section 13, page 38). This will trigger the requisite spare parts order.
4. If the residual-current device has tripped, wait at least five seconds.
5. Reactivate the residual-current device after at least five minutes. To do this, move the switch lever of the residual-
current device into the top position.
6. In the NA-Box also test the residual-current device
F229
. Use the same procedure as described for the residual-
current device
F228
.
7. Start the multicluster system at the master of the main cluster (see Sunny Island operating manual).
8. Document the test result in accordance with the locally applicable standards and directives. This is your proof that
regular inspection has taken place.
10.2
Checking the Surge Arresters
Inspection interval for surge arresters
The inspection interval for surge arresters depends on the prevailing operating temperature.
• At prevailing operating temperatures of up to 40°C: inspect every 6 months.
• At prevailing operating temperatures of above 40°C: inspect every 3 months.
Instruction of end users
Because the protective cover remains in place during this test, testing is not hazardous and can be performed by
the end user. However, if the residual-current device does not trip, the NA-Box and the multicluster system must be
disconnected from voltage sources by a qualified person.
• Instruct the end user on the necessary procedure.
• Inform the end user that the inspection interval must always be complied with.
• Point out to the end user that if a defect is detected, a qualified person is required to perform the next steps.
Procedure:
1. Check whether the signal light on the surge arrester
F230
is green or red.
If the signal light on the surge arrester shows green, the surge arrester is in proper working order.
If the signal light on the surge arrester shows red, the surge arrester is defective.
2. If the surge arrester is defective, contact Service (see Section 13, page 38). This will trigger the requisite spare
parts order.
3. Document the test result in accordance with the locally applicable standards and directives. This is your proof that
regular inspection has taken place.
10.3
Testing the Tie Switch Tripping Function Every 6 Months
Instruction of end users
Because the protective cover remains in place during this test, testing is not hazardous and can be performed by
the end user. However, if the residual-current device does not trip, the NA-Box and the multicluster system must be
disconnected from voltage sources by a qualified person.
• Instruct the end user on the necessary procedure.
• Inform the end user that the inspection interval must always be complied with.
• Point out to the end user that if a defect is detected, a qualified person is required to perform the next steps.
