SMA SB 3300-11 Installation - Manual (Page 55)

SMA Solar Technology AG Troubleshooting
Installation Manual SB33-38-11-IA-en-62 55
Vpv-Max Overvoltage at DC input. The inverter may be damaged.
Corrective measures
Disconnect the inverter from the power distribution grid immediately.
1. Disconnect the miniature circuit-breaker.
2. If installed, disconnect the external DC switch-disconnector.
3. If an Electronic Solar Switch is installed, remove it.
4. Remove all DC connectors.
5. Check the DC voltage:
– If the DC voltage is above the maximum input voltage, check the
plant design or contact the PV array installer.
– If the DC voltage is below the maximum input voltage,
reconnect the inverter to the PV array as described in section
5.4 "Setting the Display Language" (page 29).
If the message occurs again, disconnect the inverter again and contact
the SMA Service Line (see section 13 "Contact" (page 72)).
Watchdog
Watchdog Srr Internal program run fault.
Corrective measures
• If this fault occurs frequently, contact the SMA Service Line.
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).
The inverter disconnects itself from the power distribution grid for safety
reasons. The impedance is calculated from both the grid impedance and
the impedance of the grid connection cable (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-section
(= low impedance) as described in section 5.3 "Connection to the
Power Distribution Grid (AC)" (page 23). If required,
check and re-tighten the screws on the AC plugs.
• If this fault recurs, contact the SMA Service Line.
Message Description and corrective measure