Alarm Name
Measures RecommendedCauses
8 2 The Inverter Troubleshooting.
When inverter enters in shutdown mode abnormally the alarm light is illuminated Table 8 2, . .
describes the troubleshooting measures for common fault alarms in the inverter.
Grid
Over Voltage
Grid
Under Voltage
Over
Frequency
Under
Frequency
PV Over
Voltage
The grid voltage
exceeds its
allowable range.
PV modules input
voltage exceeds
the inverter’s
allowable range.
1 If the alarm occurs accidentally possibly the. ,
power grid is abnormal accidentally No extra.
action is needed.
Check the number of PV modules and adjust it if need.
PV Under
Voltage
PV modules input
voltage is under
the inverter’s
defaulted
protection value.
1 When sunlight intensity weakens PV modules. ,
voltage decreases No action is needed. .
.2 If such phenomena occur when sunlight 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
long-term 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 mobile APP.
39
2 If the alarm occurs repeatedly contact the local power. ,
station After receiving approval of the local power bureau. ,
revise the electrical protection parameters setting on the
inverter through the mobile APP.
3 If the alarm persists for a long time check whether. ,
the AC circuit breaker / AC terminals is disconnected
or not or if the grid has a power outage, .
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