INVT SPC Series User Manual

SPC Series Solar Pump Inverter Fault diagnosis and solution
-53-
Fault code
Fault type
Possible cause
Solution
OL3
Electronic
overload fault
 The inverter reports
overload pre-alarm
according to the
setting.
 Check the load and the
overload pre-alarm
points.
ETH1
To-ground
short-circuit fault 1
 The output of the
inverter is short
circuited to the
ground.
 There is a fault in the
current detection
circuit.
 Check whether the
motor wiring is normal.
 Replace the Hall
device.
 Change the main
control board.
ETH2
To-ground
short-circuit fault 2
dEu
Speed deviation
fault
 The load is too heavy
or stalled.
 Check the load and
increase the detection
time if the load is
normal.
 Check whether control
parameters are set
correctly.
STo
Mal-adjustment
fault
 SM control
parameters are set
incorrectly.
 Autotuned
parameters are not
accurate.
 The inverter is not
connected to the
motor.
 Check the load and
ensure the load is
normal.
 Check whether control
parameters are set
correctly.
 Increase the
mal-adjustment
detection time.
LL
Electronic
underload fault
 The inverter reports
underload pre-alarm
according to the
setting.
 Check the load and the
underload pre-alarm
points.
A-LS
Weak-light
pre-alarm
 The sunlight is weak
or the PV module
configuration is
insufficient.
 The device will
automatically run when
the light is sufficient.
 Check whether the PV
module configuration is
sufficient.

INVT SPC Series Specifications

General

Brand	INVT
Model	SPC Series
Category	Inverter
Language	English