socomec SUNSYS - B10, Installation And Operation Manual

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9. TROUBLE SHOOTING
PV inverter requires very little maintenance. When unexpected situation occurs, please refer to the
following table for quick troubleshooting before contacting your local service. The following table lists
common fault messages and ways to cope with the fault or error.
9.1. General Failures Analysis and Trouble Shooting Actions
Fault
Message
Fault definition Possible Causes
Proposed Actions for
End-user
Proposed Actions for
Professionals
S
y
s
te
m
Faul
t
RMCU Fault
The ground current
detected by
Inverter is higher
than threshold after
inverter connected
to AC gird
1. Obstacle,
humidity or water
exits between AC
LINE and/or
NEUTRAL to
earth ground
2. Obstacle,
humidity or water
exits between AC
LINE and/or
NEUTRAL to
earth ground in
the junction box
3. The Insulation of
AC wires is
broken that could
be bit by rat or any
animals
4. Inverter is
abnormal
1. Disconnect DC/AC
connection of Inverter by
turn off the switch.
2. Check the DC/AC wires of
the PV system. Clear
obstacle ONLY IN SAFE
CONDITIONS
3. Reconnect DC/AC
connection, check the
status of Inverter
4. If the problem persists, call
local service
*Notes: An insulation gloves
must be wearing during
procedures
d.
1. Disconnect AC side of
Inverter by turn off the AC
switch
2. Disconnect the DC side
from the Inverter
3. Check both the AC and DC
wiring and insulation
4. Reconnect AC/DC
connection, check the
status of Inverter
5. If the problem persists,
please

Update the firmware
according to instructions,
or

Replace the Inverter
*Notes: An insulation gloves
must be wearing during
procedures
Isolation
Fault
The ground current
detected by
Inverter is higher
than threshold
before inverter
connected to AC
gird
1. Obstacle,
humidity or water
exits between DC
side (PV panel) to
earth ground
2. Obstacle,
humidity or water
exits between DC
side (PV Panel) to
earth ground in
the junction box
3. The Insulation of
DC wires is
broken that could
be bit by rat or any
animals
4. Inverter is
abnormal
1. Disconnect DC/AC
connection of Inverter by
turn off switch.
2. Check the DC/AC wires of
the PV system. And Clear
obstacle ONLY IN SAFE
CONDITIONS
3. Reconnect DC/AC
connection of Inverter,
check the status of Inverter
4. If the problem persists, call
local service
Notes: An insulation gloves
must be wearing during
procedures
1. Disconnect AC side of
Inverter by opening AC
switch
2. Disconnect the DC side
from the Inverter
3. Check both the AC and DC
wiring and insulation
4. Reconnect AC/DC
connection, check the
status of Inverter
5. If the problem persists,
please

Update the firmware
according to instructions,
or

Replace the Inverter
Notes: An insulation gloves
must be wearing during
procedures