11-1
Section
Troubleshooting Tables
279
No.
Remedy
Items to check
Probable causes
Problem
25
The origin
established by the
origin search
sometimes
changes.
There is some looseness in
couplings or other
mechanical connections.
Check whether there is any
deviation from the markings at
the couplings between the
motor and axes, or at any other
connections.
Tighten up the loose
connections.
26
g
There is no Z-phase margin.
There is no margin for the
origin input signal.
Check the Z-phase margin
using the procedure given in
6-8
Z-phase Margin
. If the value is
near one rotation (the number
of pulses in one rotation), or
near zero, a deviation of one
motor revolution may occur at
the time of the origin search due
to minute changes in the timing
of sensor inputs.
Remove the motor
coupling and adjust it by
about a 1/4 turn, so that
the Z-phase margin
pulses will be equivalent
to about half of a Servo
Motor rotation, and then
try executing the origin
search again.
27
Motor rotation is
unstable.
The Servo Motor power lines
and encoder lines are wired
incorrectly.
Check the Servo Motor power
lines and encoder lines.
Correct the wiring.
28
There is eccentricity in the
couplings connecting the
motor axis and the
mechanical system. There
may be loose screws or load
torque fluctuation due to the
meshing of pulley gears.
Check the machinery. Try
turning the motor with no load
(i.e., with the machinery
removed from the coupling).
Adjust the machinery.
29
The gain adjustment is
insufficient.
---
Execute Servo Motor
autotuning.
Manually adjust the
Servomotor gain.
30
The wrong Servo Motor is
selected (so it cannot be
adjusted).
Check the torque and inertia
ratings and select another
Servomotor.
Change to a suitable
Servomotor.
31
The Servo Motor bearings
are damaged.
Turn OFF the Servo Drive
power. If the Servo Motor has a
brake, turn ON the brake power
supply and release the brake,
and then manually turn the
motor’s output axis with the
motor’s power line disconnected
(because the dynamic brake
may be applied).
Replace the Servo
Motor.
32
The Servo Motor windings
are disconnected.
With a tester, check resistance
between the Servo Motor’s U,
V, and W power lines. There
should be a proper balance
between the line resistances.
Replace the Servo
Motor.
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