25
Isolation Failure
Ground insulation
impedance of PV
string is too low
Isolation failure
could be caused by
multiple reasons
like that the PV
panels are not
grounded well, DC
cable is broken, PV
panels are aged
or surrounding
humidity is
comparatively
heavy, etc.
1.
Use multi-meter to check if the
resistance between earth & inverter
frame is close to zero. If it's not, please
ensure that the connection is well.
2.
If the humidity is too high, isolation
failure may occur.
3.
Check the resistance between PV1+/
PV2+/PV3+/PV4/+BAT+/PV- to earth.
If the resistance is lower than the
minimum isolation resistance shown in
the table( chapter 2.4.2 ) , check the
system wiring connection.
4.
Try to restart the inverter.
Check if
the fault still occurs. If not, it means it
is caused by an occasional situation, or
contact technical support.
Ground Failure
Ground leakage
current is too high
Ground failure
could be caused by
multiple reasons
like that the
neutral cable on
the AC side is not
connected well or
the surrounding
humidity is
comparatively
heavy, etc.
Check (use multi-meter) if there is
voltage (normally should be close to
0V) between earth & inverter frame. If
there is a voltage, it means the neutral
& ground cables are not connected well
on the AC side. If it happens only in the
early morning/dawn /rainy days with
higher air humidity and is recovered
soon, it should be normal.
Relay Check
Failure
Self checking of
relay failure
Neutral & ground
cables are not
connected well on
AC side or just an
occasional failure
Check (use multi-meter) if there is high
voltage (normally should be lower than
10V) between N & PE cable on the AC
side. If the voltage is higher than 10V,
it means the Neutral & ground cable
are not connected well on AC side or
restart inverter.
DC Injection
High
/
The inverter
detects a higher
DC component in
AC output
Try to restart the inverter, check
if it still occurs. If not, it is just an
occasional situation. Otherwise,
contact technical support immediately.
EEPROM R/W
Failure
/
Caused by a strong
external magnetic
field etc.
Try to restart the inverter, check
if it still occurs. If not, it is just an
occasional situation. Otherwise,
contact technical support immediately.
SPI Failure
Internal
communication
failure
Caused by a strong
external magnetic
field etc.
Try to restart the inverter,
check
if it still occurs. If not, it is just an
occasional situation. Otherwise,
contact technical support immediately.
DC Bus High
BUS voltage is
over-high
/
Try to restart the inverter. Check if the
fault still occurs. If not, it means it is
caused by an occasional situation, or
contact technical support.
