SMA SUNNY CENTRAL Maintenance manual - Manual (Page 57)

SMA Solar Technology AG Maintaining the Sunny String-Monitor
Maintenance Manual SCWAR-WEN094020 57
7. Check the safety notices on and in the device and replace them if they are damaged or no
longer legible. You can order new labels from SMA Solar Technology AG.
8. Visually check the existing fuses and tension springs on the fuse holders.
9. In addition, check the auxiliary voltage of +55 V at the connection terminals and the plug
connectors, it must be at least +30 V.
10. Check all power cable connections for looseness and tighten them if necessary. Check the
connectors and insulation for discoloration or degradation. Replace any damaged connectors
or corroded contacts.
11. Check all string cable connections for looseness and tighten them if necessary. Check the
insulation, and the terminals on the assembly as well on the busbar for discoloration or
degradation.
12. Check all cable connections of the optional DC main switch for looseness and tighten them if
necessary. Check the insulation and the switch for discoloration or degradation.
13. Check the shield connection of the communication link. It must be hand-tightened; therefore, a
screwdriver is not suitable.
14. Check the ground connection and the contact resistance to the ground potential.
15. Check the overvoltage protector, the visual display must be green.
☑ Maintenance of the Sunny String-Monitor is completed.