INVT SPC Series Operation Manual page 57

SPC Series Solar Pump Inverter
Fault code
OL3
ETH1
ETH2
dEu
STo
LL
A-LS
Fault type
Electronic
overload fault
To-ground
short-circuit fault 1
To-ground
short-circuit fault 2
Speed deviation
fault
Mal-adjustment
fault
Electronic
underload fault
Weak-light
pre-alarm
Possible cause
The inverter reports

overload pre-alarm
according to the
setting.
 The output of the
inverter is short
circuited to the
ground.
 There is a fault in the
current detection
circuit.
The load is too heavy

or stalled.
SM control

parameters are set
incorrectly.
Autotuned

parameters are not
accurate.
 The inverter is not
connected to the
motor.
The inverter reports

underload pre-alarm
according to the
setting.
 The sunlight is weak
or the PV module
configuration is
insufficient.
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Fault diagnosis and solution
Solution
 Check the load and the
overload pre-alarm
points.
Check whether the

motor wiring is normal.
 Replace the Hall
device.
Change the main

control board.
 Check the load and
increase the detection
time if the load is
normal.
 Check whether control
parameters are set
correctly.
Check the load and

ensure the load is
normal.
Check whether control

parameters are set
correctly.
 Increase the
mal-adjustment
detection time.
 Check the load and the
underload pre-alarm
points.
 The device will
automatically run when
the light is sufficient.
Check whether the PV

module configuration is
sufficient.