Alpha 6000S series User Manual page 170

Fault
Name of Protection
Display
Overcurrent with the
OC3
constant-speed operation
Overvoltage with the accelerated
Ou1
operation
Overvoltage with the decelerated
Ou2
operation
Overvoltage with the
Ou3
constant-speed operation
GF Output earthing
OH1 Heat radiator overheating
169
Possible Cause to Fault
 Abnormal load
 The acceleration or
deceleration time is set to
be too short
 The power voltage is low
 The frequency inverter
power is too small
 The frequency inverter
output load is
short-circuited
 The input voltage is
abnormal
 The acceleration time set is
too short

The stalling overvoltage
point is too low
 The input voltage is
abnormal

The deceleration time is too
short
 The load inertia torque is
large
 The stalling overvoltage
point is too low
 The input voltage is
abnormal
 The acceleration or
deceleration time is too
short
 The load inertia torque is
large
 The stalling overvoltage
point is too low
 The output earthing current
exceeds the specified value
 The environment
temperature is too high
 The air duct is blocked
 The fan works abnormally/
is damaged
Chapter 6 Troubleshooting
Countermeasure
insulation

Check the load

Increase the acceleration
or deceleration time
appropriately

Check the input power
supply

Select the
frequency-inverter with
the larger power

Check the motor coil
resistance and the motor
insulation

Check the input power
supply; check & test the
electrical level setting

Increase the acceleration
time appropriately

Raise the stalling
overvoltage point

Check the input power
supply; check & test the
electrical level setting

Increase the deceleration
time appropriately

Add the appropriate
brake components
additionally

Raise the stalling
overvoltage point

Check the input power
supply; check & test the
electrical level setting

Increase the deceleration
time appropriately

Add the appropriate
brake components
additionally

Raise the stalling
overvoltage point

Check whether the motor
insulation has become
poor
 Check whether the
connection line between
the frequency inverter
and the motor is damaged
 Reduce the environment
temperature
 Clear the air duct
 Replace the fan