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User Manual V1.1-2022-01-05 04 OTHER
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 after-sales
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 after-sales immediately.
EEPROM R/W
Failure
/
Caused by a
strong external
magnetic eld etc.
Try to restart the inverter,check
if it still occurs.If not,it is just an
occasional situation.Otherwise,
contact after-sales immediately.
SPI Failure
Internal
communication
failure
Caused by a
strong external
magnetic eld etc.
Try to restart the inverter,check
if it still occurs.If not,it is just an
occasional situation.Otherwise,
contact after-sales immediately.
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