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9 Troubleshooting and remedial actions
Phenomenon
Loss of
synchronization
during acceleration or
running.
Motor does not move
the set amount.
Current does not drop
when the motor stops.
−46−
Possible cause
The centers of the motor'
output shaft and load shaft are
not aligned.
The load or load fluctuation is
too high.
The speed of the starting
pulse is too high.
The acceleration
(deceleration) time is too
short.
Electrical noise
Wrong step angle settings.
Pulse output count is too low
or too high.
The all windings off input is
set to ON.
Remedial action
Check the connection
condition of the motor output
shaft and load shaft.
Check for large load
fluctuations during motor
operation. If adjusting the
motor's operating speed to
low and high torque eliminates
the problem, it is necessary to
review the load conditions.
Lower the speed of the
starting pulse.
Lengthen the acceleration
(deceleration) time.
Check running with only the
motor, driver and required
controller. If the impact of
noise is recognized, take
countermeasures, such as
rewiring for greater distance
from the noise source,
changing the signal cables to
shielded wire, or mounting a
ferrite core.
Check the settings of the step
angle setting switches.
Check whether or not the
number of pulses required for
operation at the set step angle
are being output.
Switch all windings off input to
OFF.
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