9
4.0 Troubleshooting
Table 4 - Troubleshooting Guide
Fault Type
Symptom
Possible Cause
Remedy
Startup fault
Inverse
Input
connection
Check the negative and positive
terminals of the DC input before
connection.
Confirm the negative and positive
terminal and then reconnect the
corresponding wire.
Low DC
Input
voltage
Use a Multimeter to measure the
voltages of the DC input to confirm
whether the voltage is higher than the
startup voltage.
Startup the inverter after the
battery is charged to the DC input
range.
Operating fault
Low-
voltage,
high-
voltage,
overload
protection.
Cut off the load to test whether the
inverter normally operates and the
voltage of each point is normal.
Consult with La Marche mfg.
Mains switching
fault
Too high or
too low
utility
supply
voltage
Use a Multimeter to measure the
voltages of the AC input to confirm
whether the voltage is within the
working range.
Switch after the utility supply
voltage is stable.
Low-voltage
shutdown
protection
of the
inverter
After the low-voltage shutdown of an
inverter, connect to the Mains without
switching.
Switch after the inverter operates
again.
Output fault
Inverter
protection
High voltage, low voltage, over-
temperature, overload.
Consult with La Marche mfg.
Communication
fault
Whether the
communicat
ion interface
is wrongly
accessed.
Check whether the correct
communication mode (RS232 or 485) is
selected.
Select correct communication
mode
Whether the
communicat
ion line is
too long.
Check whether the Baud rates of the
communication line material and panel
are consistent with each other.
Use twisted pair or reset Baud
rate.
