EG4 FLEXBOSS21 - Fault and Alarm Lists; Troubleshooting

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14.4 FAULT AND ALARM LISTS
Fault
Meaning
Troubleshooting
M3 Rx failure
M3 microprocessor fails to receive data
from DSP
Restart the inverter. If the error persists,
contact the supplier.
Model fault Incorrect model value
EPS short circuit
Inverter detected short-circuit on load
output terminals
1.
Check if the L1, L2, and N wires are
connected correctly at the inverter
load output terminal.
2. Restart inverter. If the fault persists,
contact the supplier.
EPS power reversed
Inverter detected power flowing into load
terminal
Restart the inverter. If the fault persists,
contact the supplier.
Bus short circuit
DC Bus is short circuited
Relay fault
Relay abnormal
M8 Tx failure
DSP fails to receive data from M8
microprocessor
M3 Tx failure
DSP fails to receive data from M3
microprocessor
Vbus over range DC Bus voltage too high
Ensure the PV string voltage is within the
inverter specification. If string voltage is
within range and this fault persists,
contact the supplier.
EPS connect fault
Load terminal and grid terminal are
connected wired incorrectly or reversed
Check if the wires on load terminal and
grid terminal are wired correctly. If the
fault persists, contact the supplier.
PV volt high PV voltage is too high
Check if the PV string voltage is within the
inverter specification. If string voltage is
within range and this fault persists,
contact the supplier.
Hard over curr
Hardware level over current protection
triggered
Restart the inverter. If the fault persists,
contact the supplier.
Neutral fault
Voltage between N and G is greater than
30V
Ensure the neutral wire is connected
correctly.
PV short circuit Short circuit detected on PV input
Disconnect all PV strings from the
inverter. If the error persists, contact the
supplier.
Temperature fault Heat sink temperature too high
Install the inverter in a place with good
ventilation and no direct sunlight. If the
installation site is okay, check if the NTC
connector inside the inverter is loose.
Bus sample fault
Inverter detected DC bus voltage lower
than PV input voltage
Restart the inverter, if the fault persists,
contact the supplier.
Inconsistent
Sampled grid voltage values of DSP and
M8 microprocessors are inconsistent
M8 Rx fault
M8 microprocessor fails to receive data
from DSP
Para Comm error Parallel communication abnormal
1. Check whether the connection of the
parallel cable is loose. Connect the
parallel cable correctly.
2. Ensure the PIN status of the CAN
communication cable from the first to
the end inverter is connected
correctly.