72
Class 3 status
codes
Class 3 includes status codes that may occur while feeding energy into the grid, but gen-
erally do not cause the process to be interrupted for any length of time.
The inverter disconnects automatically from the grid, the grid is then monitored as specified
and the inverter attempts to resume feeding energy into the grid.
Code
Description
Behaviour
Remedy
301
Overcurrent (AC)
Short-term interruption while
feeding energy into the grid
due to overcurrent in the invert-
er
The inverter resumes with its
start-up routine.
Fault is rectified automatically;
If this status code keeps recur-
ring: notify a Fronius-trained
service engineer
303
Power stage set overtempera-
ture
Short-term interruption while
feeding energy into the grid
due to overtemperature
The inverter resumes with its
startup routine.
Purge cooling air openings and
heat sink if necessary;
fault is rectified automatically;
If this status code keeps recur-
ring, contact your system engi-
neer
304
Internal temperature too high
305
If the grid relay is closed, no
energy is transferred to the grid
Permanent interruption while
feeding energy into the grid
If this status code keeps recur-
ring, contact your system engi-
neer
307
DC low
DC input voltage too low for
feeding energy into the grid
Short-term interruption while
feeding energy into the grid
The inverter resumes with its
startup routine.
Fault is rectified automatically;
If this status code occurs when
there is sufficient insolation,
contact your system engineer
IMPORTANT!
Due to the low level of insolation early in the morning and in the evening, the status code 307 (DC
low) is routinely displayed at these times of day. This status code does not indicate any kind of fault.
309
DC input voltage too high
Short-term interruption while
feeding energy into the grid
The inverter resumes with its
startup routine.
Fault is rectified automatically;
If this status code keeps recur-
ring, contact your system engi-
neer
321
Overcurrent (AC)
322
Overtemperature on the air in-
let sensor
Permanent interruption while
feeding energy into the grid
Reduce the ambient tempera-
ture and ensure that a suitable
hot air extractor is installed if
necessary
If this status code keeps recur-
ring, contact your system engi-
neer
