SMA SB 2800i - Manual (Page 20)

Device Description Operating Instructions
18 SMA Regelsysteme GmbH SB2800i-11:FE0504
Insulation Failure
The red LED on the Sunny Boy 2800i is on, which indicates an
earth fault.
The earth fault could have two different reasons:
• it could be an insulation failure at the connection of the PV
generator.
• one of the two thermally monitored varistors on the DC input
side is defective.
Please contact a qualified electrician who will remove the
failure following the instructions in the „Installation Guide“.
Permanent Device Disable
This signal appears if there is a failure of the grid monitoring /
the independent disconnection device (MSD). During the internal
test, the inverter has detected a malfunction of the MSD and has
stopped feeding to the grid.
Normally this is a failure which cannot be removed on site. Please
contact the manufacturer (see chapter 8 „ Contact” (page 45)) to
discuss further proceedings.