46
Class 5 Status
Codes
Class 5 status codes generally do not impair grid power feed operation, but can lead to lim-
itations in grid power feed operation. They will be displayed until the status code is ac-
knowledged by pressing a key (the inverter, however, continues working normally in the
background).
474 RCMU sensor faulty
Inverter does not feed energy
into the grid.
If this status code keeps recur-
ring, contact your system in-
staller.
475
Solar module ground, insula-
tion error (connection between
solar module and ground)
476
Supply voltage for driver too
low
480,
481
Function incompatibility (one
or more PC boards in the in-
verter are not compatible with
each other, e.g.,after PC board
replacement)
Inverter does not feed energy
into the grid.
Update inverter firmware; *)
482
Commissioning is not com-
plete
Inverter does not feed energy
into the grid.
Reset AC (switch automatic
circuit breaker on and off), car-
ry out full commissioning.
483
Voltage U
DCfix
for MPP2 string
is outside of valid range
Inverter does not feed energy
into the grid.
Check MPP settings;
If status code persists:
contact a Fronius-trained ser-
vice technician.
485 CAN transmission buffer is full
Inverter does not feed energy
into the grid.
Carry out AC reset (switch au-
tomatic circuit breaker off and
on);
If status code persists:
contact a Fronius-trained ser-
vice technician.
Code Description Details Rectification
Code Description Details Rectification
502
Insulation error on the solar
modules
Warning message is shown on
the display.
If this status code keeps recur-
ring, contact your system in-
staller.
509
No feed-in within the last 24
hours
Warning message is shown on
the display.
Acknowledge status code;
check if all conditions for fault-
free grid power feed operation
are fulfilled (e.g., if the solar
modules are covered with
snow).
If the status code persists: ob-
serve further status codes.
515 No internal communication
with filter
Warning message on the dis-
play
If status code persists: Contact
a Fronius-trained service tech-
nician
516 Communication with memory
unit not possible
Warning message of memory
unit
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