SMA SB 2500 Installation - Manual (Page 52)

Troubleshooting SMA Solar Technology AG
52 SB25-30-IA-en-51 Installation Manual
9.2 Error Messages
When a fault occurs, the inverter generates a message which depends on the operating mode and
the type of the fault detected.
Message Description and corrective measure
!PV-Overvoltage!
!DISCONNECT DC! Overvoltage at DC input
Overvoltage can destroy the inverter.
Corrective measures
Disconnect the inverter from the mains immediately.
1. Disconnect the miniature circuit-breaker.
2. If an external DC switch-disconnector is available, disconnect it.
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 "PV Array Connection (DC)" (page 28).
If the message occurs again, disconnect the inverter again and contact
the SMA Service Line (see Section 13 "Contact" (page 71)).
ACVtgRPro The 10-minute average line voltage is no longer within the permissible
range. This can be caused by either of the following:
• The line voltage at the termination point is too high.
• The mains impedance at the termination point is too high.
The inverter disconnects from the mains to assure compliance with the
power quality.
Corrective measures
Check the line voltage at the termination point of the inverter:
• If, due to the local mains conditions, the line voltage is 253 V or
more, ask the network operator whether the voltage at the feed-in
point can be adjusted, or whether they would agree to an alteration
of the limiting value of parameter "ACVtgRPro" for power quality
monitoring.
• If the line voltage is continually within the tolerance range and this
error message is still displayed, contact the SMA Service Line.
Bfr-Srr Internal measurement comparison fault or hardware defect
Corrective measures
• If this fault occurs frequently, contact the SMA Service Line.