73
Phenome
na
Conditions
Possible reasons of fault
Actions
Dispay
LU upon
power on
Thyristor or
contactor is
disconnected and the
inverter’s load is too
large
As the thyristor orcontactor
is closed, the bus voltage
will reduce when the
inverter’s load is large, so
that “LU” is displayed
instead of “F.Con”
Operate the inverter after the
thyristor or contactor are
completely closed