61
Faults, which can be auto-reset or reset by manual operation
Fault Code Content Probable Cause What to do
OC-S
Over Current
during Starting
1. Motor is short circuited
2. Motor has ground fault
3. T-verter transistor
module is damaged
1. Check and fix motor
2. Remove the grounding point
3. Change transistor module
OC-A
Over Current
during Accel.
1. Accel. Time is set too
short
2. Inappropriate V/F
pattern selection
3. Motor capacity exceeds
the T-verter rating
1. Extend Accel. Time
2. Select the optimum V/F pattern
3. Select a larger HP T-verter
OC-C
Over Current
during Constant
speed
1. Load changes
excessively
2. Input voltage fluctuates
excessively
1. Check load condition
2. Install a reactor between power
supply and T-verter
OC-d
Over Current
during Decel.
1. Decel. Time is set too
short
1. Extend Decel. Time
OC-b
Over Current
during Braking
1. Braking freq. is set too
high
2. Braking voltage is set
too high
3. Braking time is set too
long
1. Reduce braking freq.
2. Lower braking voltage
3. Shorten braking time
OV-C
Over Voltage
during Constant
speed
1. Decel. Time is set too
short or load inertia is
too high
2. Input voltage fluctuates
1. Extend Decel. Time
2. Set Fn_48 = xxx0
3. Add external braking resistor or
module
4. Install a reactor between power
supply and T-verter
5. Select a larger HP T-verter
LV-C
Low Voltage
during Constant
speed
1. Input voltage is too low
2. Input voltage fluctuates
excessively
1. Correct input voltage or extend
Fn_31
2. Extend Accel. Time
3. Select a larger HP T-verter
4. Install a reactor between power
supply and T-verter
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