29
Problem
The motor rotates too
far or not far enough.
The motor loses
synchronization during
acceleration or while
running.
Motor vibration is very
high.
Motor temperature is
very high.
[The temperature of
the motor case should
be less than 100°C
(212°F). For harmonic
geared type: less than
70°C (158°F). ]
The automatic current
cutback function does
not work.
Measures
Check the setting of the step angle switch
located on the driver.
Check the controller pulse setting.
Check this by decreasing the frequency.
Check this by increasing the acceleration/
deceleration time.
Check this by running the motor while the
machine suspected of producing the noise
interference is off.
Try reducing the motor running current with
the current adjustment potentiometer “RUN”.
If the vibration decreases after the pulse
frequency has been adjusted, this means the
motor is resonating. Either adjust the
frequency or change the step angle.
Also try installing the optional (sold
separately) clean damper (for double shaft
model only).
Shorten the running time or increase the
resting time.
Turn off the automatic current cutback
release input.
The temperature of the motor rise varies
depending on the pulse rate. Refer to the
speed-torque characteristics in the catalog,
and operate at a lower input speed.
This function does not work, and the motor
current is not reduced, when the pulse signal
is held at “photocoupler ON”. Always return it
to “photocoupler OFF”.
Turn off the automatic current cutback
release input.
Check points
12.Does the step angle
required by your
equipment match the step
angle of the stepping
motor?
13.Is the number of pulses set
to match the amount of
motor rotation?
14.Is the starting pulse
frequency too high?
15.Is the acceleration/
deceleration time too
short?
16.Is the motor being affected
by noise interference?
17.Is the output torque too
high?
18.Try changing the pulse
frequency.
19.Is the motor running time
too long?
20.Is the automatic current
cutback release function
input?
21.Try changing the pulse
rate.
22.Is the pulse/CW pulse or
rotation direction/CCW
pulse signal input
“photocoupler ON”
after the completion of the
pulse signal?
23.Is automatic current
cutback release
function being input?
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