SMA 20000TL Service Manual - Manual (Page 16)

Event number Message, cause and corrective measures
3302 Unstable operation > Abort self-test
There is not enough power at the DC input of the inverter for stable operation.
This may be caused by snow on the PV modules or insufficient irradiation. The
inverter interrupts feed-in operation and can no longer connect to the utility
grid.
Corrective measures:
1. If irradiation is too low, wait for it to increase.
2. If this message is displayed frequently, ensure that the PV array has been
correctly rated and wired.
3303 Unstable operation > Data storage blocked
There is not enough power at the DC input of the inverter for stable operation.
This may be caused by snow on the PV modules or insufficient irradiation. The
inverter interrupts feed-in operation and can no longer connect to the utility
grid.
Corrective measures:
1. If irradiation is too low, wait for it to increase.
2. If this message is displayed frequently, ensure that the PV array has been
correctly rated and wired.
3401 … 3402 DC overvoltage > Disconnect generator
Overvoltage at the DC input. This can destroy the inverter.
Corrective measures:
1. Immediately disconnect the inverter from all voltage sources (see
Section 2.2, page 7).
2. 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, ensure
that the PV array has been correctly rated or contact the installer of the PV
array.
3. If this message is repeated frequently, contact the SMA Service Line.
3501 Insulation resistance > Check generator
The inverter has detected a ground fault in the PV array.
Corrective measures:
• Check the PV system for ground faults (see Section 8, page 27).
5 Troubleshooting SMA Solar Technology AG
Service Manual for Installers STP20-25TL-SG-en-11 16