IMO SD1 Series - Page 114

SD1 Series Inverters Fault Tracking
-109-
Fault
code
Fault type Possible cause Solutions
OL2
Inverter
overload
 Acceleration is too fast.
 Restart the rotating motor
 Grid voltage is too low.
 The load is too heavy.
 The rated power is much
larger than the power
needed.
 Increase acceleration time.
 Avoid restarting after
stopping.
 Check the grid voltage.
 Select an inverter with
larger power.
 Select a proper motor.
OL3
Electrical
overload

The inverter will report
overload pre-alarm
according to the set value.
 Check the load and the
overload pre-alarm point.
SPI
Input phase
loss
 Phase loss or fluctuation of
input R, S, T.
 Check input power
 Check installation wiring.
SPO
Output phase
loss

U, V, W phase loss output
(or serious asymmetrical
three phase of the load).

Check the output wiring.
 Check the motor and
cable.
OH1
Rectify
overheat
 Air duct is blocked, or fan
is damaged.
 Ambient temperature is too
high.
 The time of overload
running is too long.
 Refer to the overcurrent
solution.
 Redistribute.
 Clear the wind channel or
change the fan.
 Decrease the ambient
temperature.
 Check and reconnect.
 Change the power.
 Change the power unit.
 Change the main control
panel.
OH2 IGBT overheat
EF External fault

SI external fault input
terminals acts.

Check the external device
input.
CE
Communication
error
 The baud rate setting is
incorrect.
 Fault occurs to the
communication circuit.
 The communication
address is wrong.
 There is strong
interference to the
communication.
 Set proper baud rate.
 Check the wiring of
communication connection
interface.
 Set proper communication
address.
 Change or replace the
wiring or improve the
anti-interference capability.