SMA SB 1300TL Service Manual - Manual (Page 15)

Message Cause and corrective measure
STM Timeout Internal program run disturbance
Corrective measures:
• If this message is displayed frequently, contact the
SMA Service Line.
Vac-Bfr
Vac-Srr The line voltage is no longer within the permissible range. The in-
verter has disconnected from the utility grid for safety reasons. This
can be caused by one of the following:
• The circuit breaker is switched off.
• The AC cable is interrupted or highly resistive.
Corrective measures:
• Ensure that the AC cable is correctly connected (see the
operating manual of the inverter).
• Ensure that the grid voltage is in the permissible range.
• Ask the grid operator for permission to change the parameters
Vac-Min / Voltage monitoring upper minimum threshold
and Vac-Max / Voltage monitoring lower maximum
threshold.
• If the AC cable is connected correctly, the grid voltage is within
the permissible range and this message is still displayed,
contact the SMA Service Line.
UpvMax Overvoltage at the DC input. This can destroy the inverter.
Corrective measures:
1. Disconnect the circuit breaker.
2. If there is an external DC load-break switch, turn it off.
3. If an ESS is plugged in, remove it.
4. Unlock and remove all DC connectors using a screwdriver
(blade width: 3.5 mm):
• Insert the screwdriver into one of the side slots.
• Remove the DC connectors.
5. Check whether the DC voltage is below the maximum input
voltage of the inverter. If the DC voltage is below the maximum
input voltage of the inverter, reconnect the DC connectors to
the inverter.
If the DC voltage is above the maximum input voltage of the
inverter, check the design of the PV system.
6. If this message is repeated frequently, disconnect the inverter
from voltage sources (see Section 2.2, page 7) and contact the
SMA Service Line.
4 Troubleshooting SMA Solar Technology AG
Service Manual 15 SB13-21TL-SG-en-11