LG LGES-5048 User Manual page 28

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