Chapter6 Troubleshooting
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192
Fault
display
Name of
protection
Possible reasons of fault Actions
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 ac drive
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
●Ac drive’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.
OL2
Ac drive
overload
●Ac drive’s output
exceed its overloading
value
●DC injection braking
current is too big
●Improper V/F curve
●Low AC supply voltage
●Too heavy load
●Too short accelerating
time
●Reduce the load, increase
accelerating time
●Reduce the DC injection
braking current, increase
braking time
●Adjust V/F curve and
torque boost
●Check the AC supply
voltage
● Select bigger capacity ac
drive.
●Increase accelerating time
SC
Load
short-circuit
●Ac drive’s output load is
short circuited
●Check resistance of the
motor’s winding
●Check the insulation of the
motor
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