Alpha 6000 User Manual page 166

Fault Name of
display protection
Over voltage
in constant
Ou3
speed
Operation
GF Ground Fault
Heat sink
OH1
overheat
Motor
OL1
overload
Possible reasons of fault
●Abnormity input
voltage
●Too short accelerating/
decelerating time setting
●Inertia torque of the
load is big
●Stall point of
overvoltage is too low
●Grounding current of
output side exceeds
specified value
●Ambient temperature is
too high
●Obstruction of
ventilation channel
●Cooling Fan does not
work
●Inverter's output exceed
the over loading value
of the motor
●Improper V/F curve
●Low AC supply voltage
●Common motor has
operated with heavy
load at low speed for a
long time
●Load changes fast
Chapter6 Troubleshooting
Actions
●Check input power
supply/ the setting of
detection level
●Increase decelerating time
properly
●Add appropriate braking
component
● Increase stall point
overvoltage
●Check whether the
insulation of the motor
become bad
●Check whether the cable
connecting the inverter
and the motor is damaged
●Lower the ambient
temperature
●Clean the ventilation
channel
●Replace the cooling fan
●Reduce the load
●Adjust V/F curve and
torque boost
●Check the AC supply
voltage
●Use a special motor if the
motor is required to
operate for a long time
● Check the load.
165