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54
Faults which can be Auto-Reset by Manual Operation
:
Fault Code
Content
Probable Cause
Action Item
OC-S
Overcurrent
during Starting
1. Motor is short circuited
2. Motor has ground fault
3. Inverter transistor
module is damaged
1. Check and fix motor
2. Remove the grounding point
3. Change transistor module
OC-A
Overcurrent
during Accel.
1. Accel Time is set too
short
2. Inappropriate V/F
pattern selection
3. Motor capacity exceeds
the Inverter rating
1. Extend Accel Time
2. Select the optimum V/F pattern
3. Select an Inverter with larger HP
OC-C
Overcurrent
during Constant
Speed
1. Load changes
excessively
2. Input voltage fluctuates
excessively
1. Check load condition
2. Install a reactor between power
supply and Inverter
OC-d
Overcurrent
during Decel
1. Decel Time is set too
short
1. Extend Decel Time
OC-b
Overcurrent
during Braking
1. Braking frequency is set
too high
2. Braking voltage is set
too high
3. Braking time is set too
long
1. Reduce braking frequency
2. Lower braking voltage
3. Shorten braking time
OV-C
Overvoltage
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 Inverter
5. Select an Inverter with larger HP