Epcom EPIG1K User Manual page 27

Grid Voltage Fault
Grid Frequency Fault
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Corrective measures
◆Check the insulation of the PV plant
◆Check the PV plant for ground faults
and have the PV generator installation
engineer to fix the ground fault before
reconnect the string in question
The grid voltage is not within the
permissible range. This fault can be
caused by any of the following conditions:
◆Power distribution grid disconnected
(miniature circuit-breaker, fuse)
◆The local grid condition is out of
acceptable range.
The inverter disconnects itself from the
public grid for safety reasons.
Corrective measures
AC Over
◆Check the grid voltage and connection
voltage
on the inverter.
AC Under
◆I If the detected grid voltage is within
voltage
permissible range, restart the PV Inverter
and try again. If fault remains, contact the
system installer to check the grid voltage
and cable connections between PV
Inverter and Utility system.
◆ If detected grid voltage is out of
permissible range, contact the system
installer to check the feed-in AC voltage
and contact the utility operator for further
action.
AC Over The grid frequency is out of the
Freq permissible range.