SMA SB 3300 Installation - Manual (Page 57)

SMA Solar Technology AG Troubleshooting
Installation Guide SB33_38-IEN111851 57
Vpv-Max Overvoltage at DC input. The inverter could be damaged.
Corrective measures
Immediately disconnect the inverter from the grid.
1. Turn off the line circuit breaker.
2. Remove the Electronic Solar Switch.
3. Disconnect all the DC connectors.
4. Check DC voltage:
– If the DC voltage exceeds the maximum input voltage, check the
plant design or contact the person who installed the PV
generator.
– If the DC voltage is below the maximum input voltage,
reconnect the inverter to the PV generator as described in
section 5.5.4 ”Connecting the PV Generator (DC)” (page 33).
If the message appears again, disconnect the inverter again and contact
the SMA Serviceline (see section 13 ”Contact” (page 73)).
Watchdog
Watchdog-Srr Internal program run fault.
Corrective measures
• If this fault continues to occur, contact the SMA Serviceline.
Zac-Bfr
Zac-Srr The grid impedance is no longer within the permissible range
("Bfr" or "Srr" is an internal message of no relevance for the user).
For safety reasons, the inverter disconnects itself from the grid. The
impedance is calculated from both the grid impedance and the
impedance of the AC cable of the inverter.
Corrective measures
• Check the grid impedance and grid connection on the inverter.
• Use an AC cable with an adequate cross-sectional area
(= low impedance) as described in section 5.3 ”Connection to the
Power Distribution Grid (AC)” (page 22). If required, check and re-
tighten the screws on the AC terminals.
• If this fault recurs, contact the SMA Serviceline.
Message Description and Corrective Measure