Goodwe ETC Series User Manual page 50

09 Maintenance
No. Fault
14 GridVoltFault
IsolationFault
15
(PV array earth fault)
Cause
The grid voltage
exceeds the
permissible
range, or the
duration of high
voltage exceeds
the requirement
of HVRT.
1. The PV string is
short-circuited
to PE.
2. The PV system
is in a moist
environment
and the cable
is not well
insulated to
the ground.
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User Manual V1.0-2023-04-30
Solutions
1. If the problem occurs occasionally,
the utility grid may be abnormal
temporarily. The inverter will recover
automatically after detecting that the
utility grid is normal.
2. If the problem occurs frequently, check
whether the grid voltage is within the
permissible range.
• Contact the local power company
if the grid voltage exceeds the
permissible range.
• Modify the overvoltage protection
threshold, HVRT or disable the
overvoltage protection function after
obtaining the consent of the local
power company if the grid frequency
is within the permissible range.
3. Check whether the AC breaker and the
output cables are connected securely
and correctly if the problem persists.
Check whether the resistance of the PV
string to PE exceeds 50kΩ. If no, check the
short circuit point.
Check whether the PE cable is connected
correctly.
If the resistance is lower than default on
rainy days, please reset the ISO.
In Australian and New Zealand, customers
can also be alerted in the following ways in
the event of insulation impedance failure:
The inverter is equipped with the buzzer,
and the buzzer will sound continuously for
1 minute in case of failure.
If the problem persists, the buzzer sounds
every 30 minutes.
Add the inverter to the monitoring
platform, and set the alarm reminder,
the alarm information can be sent to the
customer by emails.