44
Grid
Fault
power bureau, revise the electrical protection
parameters setting through SE Touch, APP on the PV
inverter.
3. If the alarm persists for a long time, check that the
AC circuit breaker/ AC terminals is disconnected, or
that the grid has a power outage.
Over
Frequency
Under
Frequency
PV Over
Voltage
PV modules input voltage
exceeds the inverter’s
allowable range.
Check whether the number of PV modules and adjust
it.
PV
Under
Voltage
PV modules input voltage
is under the inverter’s
default protection value.
1. When the sun light intensity weakens, PV modules
voltage decreases. No action is needed.
2. If such phenomena occur when the sun light
intensity does not weaken, check if there is short
circuit, open circuit etc. in the PV strings.
Insulation
Resistance
Abnormal
A short circuit exists
between PV strings and
protection ground.
PV strings are installed in a
permanently moist
environment.
1. Check the insulation resistance against the ground
for the PV strings. If a short circuit has occurred,
rectify the fault.
2. If the insulation resistance against the ground is less
than the default value in a rainy environment, set
Insulation resistance protection
on SE Touch.
Residual
Current
Abnormal
The insulation resistance
against the ground at the
input side decreases during
inverter operation, which
causes excessively high
residual current.
1. If the alarm occurs accidentally, possibly the
external circuits are abnormal accidentally. The
inverter automatically recover to the normal operating
status after the fault is rectified.
2. If the alarm occurs repeatedly or lasts a long time,
check whether the insulation resistance against the
ground of PC strings is too low.
PV
Strings
Abnormal
PV strings have been
shielded for a long time.
PV strings are
deteriorating.
1. Check whether the PV string is shielded.
2. If the PV string is clean and not shielded, check
whether the PV modules are aging or deteriorated.
PV
The cables of PV strings
Check whether the cables of PV strings are correctly
