Alpha 6000 - Page 166

Chapter6 Troubleshooting
165
Fault
display
Name of
protection
Possible reasons of fault Actions
Ou3
Over voltage
in constant
speed
Operation
●Abnormity input
voltage
●Too short accelerating/
decelerating time setting
●Inertia torque of the
load is big
●Stall point of
overvoltage is too low
●Check input power
supply/ the setting of
detection level
●Increase decelerating time
properly
●Add appropriate braking
component
● Increase stall point
overvoltage
GF Ground Fault
●Grounding current of
output side exceeds
specified value
●Check whether the
insulation of the motor
become bad
●Check whether the cable
connecting the inverter
and the motor is damaged
OH1
Heat sink
overheat
●Ambient temperature is
too high
●Obstruction of
ventilation channel
●Cooling Fan does not
work
●Lower the ambient
temperature
●Clean the ventilation
channel
●Replace the cooling fan
OL1
Motor
overload
●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
●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.