Checking The Surge Arrester - SMA SUNNY CENTRAL 500CP-US/CA Maintenance Manual

7 Maintenance in Disconnected State

7.7 Checking the Surge Arrester

Figure 7: Position of the surge arrester
Position Designation
A Ready indicator of the surge arrester
Additionally required maintenance material (not included in the scope of delivery):
☐ A testing device approved by the manufacturer of the surge arrester
(e.g. the PM20 from DEHN + SÖHNE GmbH + Co. KG.)
Procedure:
1.
Danger to life due to electric shock or electric arc by touching live components
• Disconnect the inverter and wait 15 minutes until the capacitors have discharged completely (see Section 6).
2. Open the interface cabinet.
3. Check the surge arresters (see the testing device documentation).
4. Check whether the ready indicator of one of the surge arresters is red.
If the ready indicator of one of the surge arresters is red, replace the surge arrester.
– Remove the cables from the surge arrester. Mark the cables. The cables must be reconnected to the same
terminals later.
– Open the terminal and remove the surge arrester upwards out
of the top-hat rail.
34 SCCP-US-WH-US_en-31
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Maintenance Manual