SMA SUNNY BOY 5000-US Installation Manual page 78

Troubleshooting
Error type
Interference
Warning
Interference
Interference
Interference
Error
Interference
Error
Interference
Error
Interference
Interference
78 SB50US-80US-IA-en-36
Error code
Fac-Ocu, Fac-Srr
GFDI Fuse Open
Grid-Timeout, Grid-
Fault-S
Imax
K1-Close
K1-Open, K2-Open
MSD-FAC, MSD-Idif
MSD-VAC
OFFSET
ROM
Shut-Down
Vac-Ocu, Vac-Srr
Description
The AC power frequency is exceeding the
permissible range. To prevent islanding, the
Sunny Boy disconnects itself from the power
distribution grid.
If the power frequency is within the tolerable
range and the error message "Fac-Ocu" or "Fac-
Srr" continues to be displayed, contact SMA.
The GFDI fuse is cleared. Before replacing the
fuse, check the PV array for a ground fault error.
The system configuration cannot be detected
(208 V/240 V/277 V).
If a 277 V grid is configured: Check whether the
cables for L1 and N are located in the correct
connection terminals.
Overcurrent on the AC side. The current to the AC
grid exceeds the guidelines. The reason for this
may be severe grid interference. If "Imax"
appears frequently, check the AC grid. If you
require help, contact SMA.
Relay test failed. Contact SMA.
Internal measurement comparison fault:
The OCU and SRR values measured by the Sunny
Boy differ too strongly from one another.
Contact SMA.
Grid monitoring self-test failed.
The internal test of the Sunny Boy control system
firmware failed. If this fault occurs frequently,
contact SMA.
Continuous internal overcurrent.
The AC grid voltage is exceeding the permissible
range. The cause may be disconnection from the
power distribution grid or from an AC cable. To
prevent islanding, the Sunny Boy disconnects
itself from the power distribution grid.
If the error message "Vac-Ocu" or "Vac-Srr" is
displayed despite the grid voltage being within
the tolerable range, contact SMA.
SMA America, LLC
Installation Manual