IMO SD1 Series - Page 113

SD1 Series Inverters Fault Tracking
-108-
Fault
code
Fault type Possible cause Solutions
OC1
Over-current
during
acceleration
 Acceleration is too fast.
 Grid voltage is too low.
 Inverter power is too small.
 Load transients or is
abnormal.
 To-ground short circuit or
output phase loss occur.
 There is strong external
interference.
 The overvoltage stall
protection is not open.
 Increase acceleration time.
 Check input power.
 Select the inverter with a
larger power.
 Check if the load is short
circuited (to-ground short
circuit or line-to-line short
circuit) or the rotation is not
smooth.
 Check the output wiring.
 Check if there is strong
interference.
 Check the setting of
related function codes.
OC2
Over-current
during
deceleration
OC3
Over-current
when running
at constant
speed
OV1
Over-voltage
during
acceleration
 The input voltage is
abnormal.
 There is large energy
feedback.
 No brake components.
 Braking energy is not
open.

Check the input power.
 Check if the load
deceleration time is too
short or the inverter starts
during the rotation of the
motor, or it is necessary to
install dynamic braking
components.
 Install the brake
components.
 Check the setting of
related function codes.
OV2
Over-voltage
during
deceleration
OV3
Over-voltage
when running
at constant
speed
UV
DC bus
under-voltage
 The voltage of the power
supply is too low.
 Check the input power of
the supply line.
OL1 Motor overload

The voltage of the power
supply is too low.
 The motor setting rated
current is incorrect.
 The motor stall or load
transients are too strong.
 Check grid voltage.
 Reset the rated current of
the motor.
 Check the load and adjust
the torque lift.