SMA SUNNY BOY 3000-US Installation Manual page 76

10 Troubleshooting
Message
ROM
Shut-Down
Vac-Bfr, Vac-Srr
VacL1-Ocu, VacL2-
Ocu, VacL1-Srr,
VacL2-Srr
VpvMax
!PV Overvoltage!!
Disconnect DC!
Watchdog
XFMR_TEMP_F
76 SB30-40-US-IA-en-33
Cause and corrective measures
Internal test of the inverter control system firmware failed.
Corrective measures:
• If the message occurs frequently, contact the SMA Service Line
(see Section 15).
Overcurrent present at the DC input of the inverter.
The inverter switches off.
Corrective measures:
• If the message occurs frequently, ensure that the design and circuitry
of the PV array are correct.
The AC line voltage exceeds the permissible range.
This may be caused by disconnection of the power distribution grid or of
an AC cable. To prevent islanding, the inverter disconnects from the power
distribution grid.
Corrective measures:
• If the message "Vac-Bfr" or "Vac-Srr" is displayed, even though the
line voltage is within the permissible range, contact the
SMA Service Line (see Section 15).
The DC input voltage is too high or too low on the indicated branch.
Corrective measures:
• Contact the SMA Service Line (see Section 15).
The DC input voltage is above the maximum configured limiting value.
Corrective measures:
• Turn the rotary switch of the DC Disconnect to the Off position
immediately.
An internal program run fault has been detected.
Corrective measures:
• Contact the SMA Service Line (see Section 15).
A high transformer temperature has been detected.
The inverter stops operation and the fan runs at maximum speed.
Corrective measures:
• Ensure sufficient ventilation.
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