8 Trouble diagnosis and countermeasures
－
31
－
Phenomenon Estimated
cause
Measure
Incorrect CW/CCW input or
faulty connection.
The motors driven in the CW
direction when the CW/CCW input
is set to the L level. CCW direction
when the CW/CCW input is set to
the H level.
The motor is
driven opposite
of the specified
direction.
Speed reduction ratios
30:1, 50:1 and 100:1 are
used in the combination
type, or 20:1, and 30:1 are
used in the geared type.
When these speed reduction ratios
are used, drive direction is opposite
to that of the motor. Reverse the
CW/CCW input operation.
The motor (gearhead)
output shaft and load shaft
are not aligned with each
other.
Make sure that the motor
(gearhead) output shaft and load
shaft are connected in an
appropriate manner.
Unstable motor
operation with
big vibration
Affected by noise
Check for running only with the
motor, driver and controller
required for running. If noise
influence has been confirmed, take
the appropriate measures such as
separation from noise generating
source, re-connection of wiring,
replacement of the signal cable by
a shielded cable, and installation of
a ferrite core.
The motor is stopped by
START/STOP input.
Stop the motor by RUN/BRAKE
input.
The motor fails
to stop
instantaneously.
Load inertia may be
excessive.
For this check, increase the
frictional load or reduce the load
inertia.
