Fronius IG 300 - Manual (Page 63)

55
If the display fails to come on even some time after sunrise, check the open-circuit
voltage of the solar modules.
If the open-circuit voltage of the modules (at the FRONIUS IG connections) is less than
170 V, it is reasonable to assume that there is a fault elsewhere in the photovoltaic
system.
If the open-circuit voltage of the solar modules (at the FRONIUS IG connections) is more
than 170 V, this may indicate a basic fault in the FRONIUS IG. In this event, always notify
a FRONIUS-trained service engineer.
Total failure
After waiting for a short while, FRONIUS IG will resume mains synchronisation (Display:
„SYNC
AC
“).
Service codes displayed
The FRONIUS IG is able to perform a system self diagnosis that automatically detects
many faults that may occur and shows them on the display unit. This system means that
you are promptly made aware of malfunctions in the FRONIUS IG, the photovoltaic
system or any installation or operating faults.
If the system self diagnosis has detected a specific fault, the associated service code will
be shown on the display.
NOTE! Service codes may sometimes appear briefly as a result of the FRONI-
US IG’s control response. If the FRONIUS IG then continues working with no
sign of any problem, this means that there was no fault.
Service display
If the open-circuit voltage of the solar modules increases to over 170 V, the FRONIUS IG
will start synchronising with the mains (display „SYNC
AC
“).
If there is still insufficient power at the solar modules, then the message „POWER
LOW
“
will appear on the display unit.
General service
codes If the open-circuit voltage of the solar modules is still too low, then the message „DC
LOW
“
will appear on the display unit.