INVT SPC Series Operation Manual page 55

SPC Series Solar Pump Inverter
Fault code
UV
OL1
OL2
SPO
OH2
EF
CE
Fault type
Bus undervoltage
fault
Motor overload
Inverter overload
Phase loss on
output side
Inverter module
overheat
External fault
RS485
communication
fault
Possible cause
The voltage of the

grid is too low.
 The overvoltage stall
protection is not
enabled.
The grid voltage is

too low.
The motor rated

current is set
incorrectly.
The motor stall

occurs or the load
transient is too large.
The ACC is too fast.

 The rotating motor is
reset.
The grid voltage is

too low.
The load is too

heavy.
 The motor power is
too small.
Phase loss output

occurs to U, V, W (or
the three phases of
the load are seriously
asymmetrical).
Air duct jam or fan

damage occurs.
Ambient temperature

is too high.
 The time of overload
running is too long.
SI external faulty

input terminal action.
The baud rate setting

is incorrect.
 A fault occurs to the
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Fault diagnosis and solution
Solution
 Check the grid input
power supply.
Check the setting of

related function codes.
Check the grid voltage.

Reset the motor rated

current.
 Check the load and
adjust the torque boost
quantity.
 Increase the ACC time.
 Avoid the restarting
after stop.
Check the grid voltage.

Select an inverter with

larger power.
 Select a proper motor.
 Check the output
wiring.
Check the motor and

cables.
Dredge the vent duct or

replace the fan.
 Lower the ambient
temperature.
Check external device

input.
Set a proper baud rate.

Check the

communication