66
8-2. Failure causes and troubleshooting
-
Run with the impermissible
inertia moment.
Confirm that the load inertia
moment is within the allowable
range.
Prolong the deceleration time or
reduce the load inertia moment.
Otherwise, switch to a motor driver
having large capacity.
Main circuit
voltage
reduction
Uv
Entered the power supply
voltage that is less than the
permissible value.
Measure the power supply
voltage.
Set the power supply voltage within
the range specified for the product.
Reduced the power supply
voltage during operation.
Measure the power supply
voltage during operation.
Increase the power supply
capacity.
Instantaneous power failure
occurred.
-
Name
Display
Main cause
Method of confirmation
Troubleshooting
Main circuit
overvoltage
ov
Entered impermissible power
supply voltage.
Measure the power supply
voltage.
Set the power supply voltage within
the range specified for the product.
A motor might be faulty. Replace
the motor.
A short circuit inside the
extension cable or a ground
fault.
Check the extension cable
continuity.
Repair or replace the extension
cable.
A short circuit inside the driver
or a ground fault.
The resistance value of the
regenerative resistor is high
for the operation condition.
(or it is not connected.)
Check the operation condition
and the regenerative
resistance value.
Examine the regenerative
resistance value again by
considering the operation
condition.
Check the continuity of the
UVW and FG terminals of the
driver.
A driver might be faulty.
Replace the driver.
Check the overload protection
characteristic and the
operation command.
Revise the operation condition, and
make the corresponding changes.
Otherwise, switch to a motor driver
having large capacity.
A motor did not run and the
load increased due to
mechanical factors.
(Example: operating brakes in
the locked status)
Check the operation command
and the motor rotation speed.
oC
A short circuit inside the motor
or a ground fault.
Check the resistance of the
motor winding wire.
Heavily loaded while operating
the motor.
Confirm that the operation
condition is not outside the
specified range.
Revise the operation condition, and
reduce the load. Otherwise, switch
to a motor driver having large
capacity.
Overload
oL
Incorrect wiring or contact of
the extension cable.
Check the wiring.
Adjust the wiring.
Operated by surpassing the
overload protection
characteristic limit.
Instantaneou
s overcurrent
Improve the mechanical factors.
