SMA SMC 7000HV Installation - Manual (Page 71)

SMA Solar Technology AG Troubleshooting
Installation Manual SMC70HV11-IA-IEN112970 71
Vac-Bfr
Vac-Srr The grid voltage is no longer within the permissible range ("Bfr" or "Srr" is
an internal message that has no meaning for the user). This fault can be
caused by any of the following conditions:
• Power distribution grid disconnected (miniature circuit-breaker,
fuse),
• AC cable is broken or
• AC cable is highly resistive.
The inverter disconnects itself from the public grid for safety reasons.
Corrective measures
• Check the grid voltage and connection on the inverter.
• If the grid voltage lies outside the acceptable range because of
local grid conditions, ask the distribution grid operator if the
voltages can be adjusted at the feed-in point or if they agree to
changes in the values of the monitored operational limits (operation
parameters: Vac-Min and Vac-Max).
• If the grid voltage lies within the tolerance range, yet "Vac-Bfr" or
"Vac-Srr" faults are still displayed, contact the SMA Serviceline.
Vpv-Max Overvoltage at DC input. The inverter could be damaged.
Corrective measures
Disconnect the inverter from the power distribution grid immediately:
1. Turn off the miniature circuit-breaker.
2. Remove the Electronic Solar Switch.
3. Remove all DC connectors.
4. Check 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 under the maximum input voltage, reconnect
the PV array to the inverter as described in section
5.4 "Connecting the PV Array (DC)" (page 30).
If the message occurs again, disconnect the inverter again and contact
the SMA Serviceline (see section 13 "Contact" (page 85)).
Watchdog Internal program run disturbance.
Corrective measures
• If this disturbance occurs frequently, contact the SMA Serviceline.
Message Description and corrective measure