5. Troubleshooting & Maintenance
a. Check the inverter every 6 months or 1 year to verify if there are damages on cables, accessories,
terminals and the inverter itself.
Inverter Maintenance
5.2 LED Displays
5.1 Regular Maintenance
b. Check the inverter every 6 months to verify if the operating parameter is normal and there is no
abnormal heating or noise from the inverter.
1. Fault on the LCD
31
32
c. Check the inverter every 6 months to confirm there is nothing that covers the inverter heat sink, if there
is, shut-down the inverter and clear the heat sink.
Battery Maintenance
Follow the manufacturer's requirements on maintenance. When you carry out these works on batteries,
please make sure to fully shut-down the inverter for safety consideration.
Display
LED
Description
Green LED
Solid lit
Suggestion
Flashing
Working normally
Firmware upgrading
Wait till upgrading complete
Yellow LED
Red LED
Solid lit
Solid lit
Warning, inverter working
Need troubleshooting
Fault, inverter stop work
Need troubleshooting
5.3 Troubleshooting Based On LCD Displays
Once there is any warning or fault occurring, users can troubleshoot according to the LED status and
the warning/fault information on the LCD.
If the dot on the left of fault item is red, it means the fault is active. When it is grey, it means the fault is
deactive
Alarm record
M8 Rx fault
Inconsistant
Fault status
Fault record
Alarm status
M3 Rx failure
Model fault
ReservedB
ReservedC
ReservedD
ReservedE
ReservedF
ReservedG
ReservedH
ReservedI
ReservedJ
Eps short circuit
Bus short circuit
ReservedK
Relay fault
M8 Tx failure
M3 Tx failure
Vbus over range
Eps connect fault
PV volt high
Hard over curr
Neutral fault
PV short circuit
Temperature fault
Bus sample fault
ReservedL
Eps power reversed
ReservedA
M3 microprocessor fails to receive
data from DSP
Model fault
Incorrect model value
Eps short circuit
Inverter detected short-circuit on
EPS output terminals
Restart inverter, if the error still exists, contact
Luxpower service or your inverter supplier.
1. Check if the L1, L2 and N wires are connected
correctly at inverter EPS output port;
2. Disconnect the EPS breaker to see if fault
remains. If fault persists, contact Luxpower
service or your inverter supplier.
Meaning
Fault
Troubleshooting
M3 Rx failure
Bus short circuit
Relay fault
DC Bus is short circuited
Relay abnormal
Eps power reversed
Inverter detected power flowing
into EPS port
M3 Tx failure
DSP fails to receive data from M3
microprocessor
M8 Tx failure
DSP fails to receive data from M8
microprocessor
PV volt high
PV voltage is too high
Please check if the PV string voltage is within the
inverter specification. If string voltage is within
range, and this fault still appears, contact Luxpower
service o your inverter supplier.
Please check if the PV string voltage is within
the inverter specification. If string voltage is
within range, and this fault still appears, contact
Luxpower service or your inverter supplier.
Vbus over range
Eps connect fault
DC Bus voltage too high
EPS port and grid port are
connected mixed up
Check if the wires on EPS port and grid port are
connected correctly. If the error exists, contact
Luxpower service or your inverter supplier.
Restart inverter, if the error still exists, contact
Luxpower service or your inverter supplier.
4.4 Start-up and shut down the inverter
Step1. Turn on the battery system firstly
，
then turn on the DC breaker between battery and inverter.
Step2. Make sure the PV voltage of the strings are higher than 120V ,and check if the inverter works in PV
charge or PV charge back-up mode.
Step3. Make sure step1and 2 above work properly before turning on the grid power or generator breaker,
and check if the inverter can go to bypass mode and on-grid mode normally.
Danger: Do not disconnect the battery , PV and AC input power under load.
If there is emergency issue , and you have to shut down the inverter ,please follow the steps as below.
Step1. Turn off the Grid breaker of the inverter.
4.4.1 Start up the inverter
4.4.2 Shut down the inverter
Step2. Switch off the load breaker.
Step3. Turn off PV breaker and then battery breaker, waiting for the LCD to go off.