SMA SUNNY CENTRAL Maintenance manual - Manual (Page 63)

SMA Solar Technology AG Maintaining the Sunny String-Monitor SSM24-11
Maintenance Manual SCWAR-WEN094020 63
3. Check whether there is condensation water in the device.
☑ If there is condensation water in the bottom plate area, clean the two condensation drains
(A) in the plinth of the Sunny String-Monitor.
4. Check the mounting of all Plexiglass covers for damage and ensure that they are securely
mounted.
5. 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.
6. Visually check the existing fuses and fuse holders.
7. In addition, check the auxiliary voltage of +55 V at the connection terminals and the plug
connectors, it must be at least +30 V.
9. 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.
10. Check all string cable connections for looseness and replace defective spring terminals if
necessary. Check the insulation, and the terminals on the assembly as well on the busbar for
discoloration or degradation.
11. Check all cable connections of the DC main switch for looseness and tighten them if necessary.
Check the insulation and the switch for discoloration or degradation.
12. Check the shield connection of the communication cables. The shield connection must only be
hand-tightened.
13. Check the ground connection and the contact resistance to the ground potential.
14. Check the overvoltage protector. The visual display must be green.
8. Check the entries of the connection cables for dirt,
damage and sealing.