SMA GRID CONNECT BOX 12 - Manual (Page 29)

SMA Solar Technology AG 10 Maintenance
Operating Manual GRID-BOX-12-3-20-BE-en-10 29
10.2 Checking the Surge Arresters
Procedure:
1. Check whether the signal lights on the surge arresters are showing 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.
• Arrange for the surge arrester to be replaced immediately. Contact the SMA Service Line (see Section 13,
page 35).
2. 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 Maintenance Work Every 12 Months
Inspection interval for surge arresters
The inspection interval for surge arresters depends on the prevailing operating temperature.
• At prevailing operating temperature up to 40°C: every 6 months
• At prevailing operating temperature over 40°C: every 3 months
Instruction of end users
The test of the surge arresters is not hazardous and can be performed by the end user. However, if a surge arrester
is defective, it must be replaced by a qualified person.
• Instruct the end user on the necessary procedure.
• Remind the end user that the inspection interval must be complied with.
• Point out to the end user that if a surge arrester is defective, a qualified person is required to perform the next
steps.
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Danger to life due to electric shock
High voltages are present in the Grid Connect Box and the multicluster system. Touching live components can result in
death or serious injury due to electric shock.
• Disconnect the Grid Connect Box and multicluster system from all voltage sources before carrying out any work
on the Grid Connect Box (see Section 8, page 22).
The ambient conditions influence the maintenance intervals
Geographic location and ambient conditions influence the length of maintenance intervals. More frequent cleaning
and corrosion protection work may be necessary in adverse ambient conditions.
• If the Grid Connect Box is subject to adverse ambient conditions, SMA Solar Technology AG recommends
carrying out maintenance work more frequently.
• SMA Solar Technology AG recommends performing an optical inspection once a month to determine
maintenance needs.