SMA SUNNY CENTRAL 900CP XT - Checking the Fuses;Disconnection Blades; 6.4.2.10 Checking the Bolted Connections of the Power Cabling

6 Maintenance
SMA Solar Technology AG
Maintenance ManualSCCPXT-E7-WA-en-3758
2. Check surfaces for damage or corrosion.
If the surfaces are damaged or corroded, repair them without delay or within three weeks at the latest.
3. To remove small-area surface damage:
• Sand the surface.
• Clean the surface with degreaser.
• Paint the surface.
4. To remove large-area surface damage:
• Sand the surface.
• Clean the surface with degreaser.
• Paint the entire surface.
6.4.2.9 Checking the Fuses/Disconnection Blades
Required maintenance material (not included in the scope of delivery):
☐ A high-temperature resistant, chemically inert special grease
DANGER
Danger to life due to electric shock or electric arc if live components are touched
• Switch off the inverter and wait at least 15minutes before opening it to allow the capacitors to discharge
completely.
• Disconnect the inverter (see Section4, page26).
Procedure:
1. Check the fuses/disconnection blades and tension springs for any discoloration or change in appearance.
If they are discolored or changed in any way, replace them.
2. Check insulation and terminals for any discoloration or change in appearance.
If insulation and terminals are discolored or changed, contact us (see Section9 "Contact", page68).
3. Remove fuses / disconnection blades one by one from the fuse holders. For this, use fuse extractor. It must be
possible to remove the fuse without effort.
4. Check whether the contact surfaces of the fuses / disconnection blades are free from hardened grease. Clean
contact surfaces if they are covered with hardened grease. Then apply new grease to the surfaces.
5. Insert all fuses and disconnection blades into the fuse holders. For this, use fuse extractor.
6.4.2.10 Checking the Bolted Connections of the Power Cabling
DANGER
Danger to life due to electric shock or electric arc if live components are touched
• Switch off the inverter and wait at least 15minutes before opening it to allow the capacitors to discharge
completely.
• Disconnect the inverter (see Section4, page26).