19
USER MANUAL
TROUBLESHOOTING
The operating state of the micro inverters can be
monitored on the Gateway LCD. LCD shows the status of
the plant on default view. In normal operation the status
is »working«, it means that everything is OK.
If an internal or external fault occurred, the LCD displays
status: »alarm« . Gateway stores errors in alarm list, which
5 Troubleshooting
5.1 List of errors in alarm list
can be at any time retrieved from it with web application.
The inverter will not feed the grid while the alarm on LCD is
present.
Only technically qualified personal may perform work on
electrical installation.
Example of Alarm history from web application
1
ERR_OVER_
CURRENT_SW
Over current on AC side is detected by software.
Possible cause is short circuit on grid lines or sudden voltage drop on grid lines.
Proposed action:
• Check connecting lines
• Check surge protections on lines
• Check external power capacitors banks for power factor corrections
• Scan grid voltage for deeps
2
ERR_OVER_
CURRENT_HW
Over current is detected by hardware. Possible cause is very high short circuit current, very
deep voltage transients or high voltage surge spikes.
Proposed action:
• Check connecting lines
• Check surge protections on lines
• Check external power capacitors banks for power factor corrections
• Scan grid voltage for deeps
3
ERR_OVER_
VOLTAGE
This signal is active if DC high voltage too high.
Possible cause for DC high voltage to rise above safety limits is very unstable grid with
changing shadows on PV module.
Proposed action:
High voltage spikes from grid are transferred to DC high voltage capacitors
Check grid voltage and transients
