55
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 an Inverter with larger HP
4. Install a reactor between power
supply and Inverter
OH-C
Overheat during
Constant speed
1. Load is too high
2. Ambient temperature is
too high or ventilation is
poor
1. Investigate load condition
2. Select an Inverter with larger HP
3. Lower ambient temperature or
improve ventilation
OH1
Braking Resistor
Overload
1. Decel Time is too short
2. Frequent Run / Stop
operation
3. Load is too high
1. Increase Decel Time.
2. Increase Run / Stop cycle
3. Set
Fn_44
to xx0x and increase
resistance of braking resistor
Faults which can be Reset by Manual Operation, but cannot be Auto-Reset
:
Fault Code
Content
Probable Cause
Action Item
- OC -
Overcurrent
during Stop Mode
1. Detecting circuit failure
2. CT Signal cable failure
1. Send Inverter back to factory
for repair
OL1
Motor Overload
1. Load is too high
2. Inappropriate V/F
pattern selection
3. Incorrect
Fn_69
,
Fn_70
setting
1. Select an Inverter with larger
HP
2. Select optimum V/F pattern
3. Select correct
Fn_69
&
Fn_70
setting
OL2
Inverter Overload 1. Load is too high
2. Inappropriate V/F
pattern selection
1. Select a larger HP Inverter
2. Select optimum V/F pattern
OL3
Overtorque
1. Load is too high
2. Inappropriate V/F pattern
selection
3.
Fn_78
,
Fn_79
are set
too low
1. Select a larger HP Inverter
2. Select optimum V/F pattern
3. Select appropriate
Fn_78
&
Fn_79
settings