FIGURE 13 (CONTINUED) –
LED display messages and interpretation
DISPLAY REASON
PROBABLE CAUSE
CORRECTIVE ACTION
Transient load fluctuation
Examine loading configuration
OCC
Over-current at
steady speed
Transient power supply fluctuation
Put inductor on power supply input
OCd
Over-current at
deceleration
Deceleration setting too short
Adjust to longer deceleration time
Motor coil shorted to frame
Repair or replace motor
External motor connections shorted to
ground
Correct wiring
OCS
Over-current while
starting
Transistor module damaged
Repair or replace inverter
Detection circuit defective.
Repair or replace inverter
OH
Overheated
inverter while not
operating
Excessive ambient temperature or poor
ventilation
Improve ventilation
Loading too heavy
Reduce motor load
OHC
Overheated
heatsink while
operating
Ambient temperature too high or poor
ventilation
Improve ventilation
Loading too large
Replace motor with larger one
Improper V/F model setting
Adjust V/F curve setting
OL1
Overloaded motor
Improper Fn_18 setting
Adjust F18 to a proper setting
Loading too large
Replace inverter with larger one
OL2
Overloaded
inverter
Improper V/F model setting
Adjust V/F curve setting
Power supply voltage too high
Examine the power supply
OV
Over-voltage while
stopped
Detection circuitry defective
Return the inverter for repair
Deceleration time too short or inertial
loading too large
Adjust to longer deceleration time
OVC
Over-voltage
during deceleration
Excessive supply voltage variation
Put inductor on power supply input
F11 = “000”, F07 = “000” and frequency
setting < 1 Hz
N/A – this is a status indication, not a
fault
SP0
Zero Speed
Stopping
F11 = “001”, F07 < F06/100, and
frequency setting < F06/100
N/A – this is a status indication, not a
fault
SP2
Keypad
emergency stop
The inverter is set up for external operation
(F10 = “001”) and the STOP key is
pressed while motor is running. The
inverter stops according to the setting of
F14. The RUN switch must be turned OFF
then ON to restart the machine.
N/A – this is a status indication, not a
fault
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