Omron CS1W-NC113 Manual page 289

Troubleshooting Tables
No. Problem
The origin
25
established by the
origin search
sometimes
changes. g
26
Motor rotation is
27
unstable.
28
29
30
31
32
Probable causes
There is some looseness in
couplings or other
mechanical connections.
There is no Z-phase margin.
There is no margin for the
origin input signal.
The Servo Motor power lines
and encoder lines are wired
incorrectly.
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.
The gain adjustment is
insufficient.
The wrong Servo Motor is
selected (so it cannot be
adjusted).
The Servo Motor bearings
are damaged.
The Servo Motor windings
are disconnected.
Items to check
Check whether there is any
deviation from the markings at
the couplings between the
motor and axes, or at any other
connections.
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.
Check the Servo Motor power
lines and encoder lines.
Check the machinery. Try
turning the motor with no load
(i.e., with the machinery
removed from the coupling).
---
Check the torque and inertia
ratings and select another
Servomotor.
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).
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.
Section 11-1
Remedy
Tighten up the loose
connections.
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.
Correct the wiring.
Adjust the machinery.
Execute Servo Motor
autotuning.
Manually adjust the
Servomotor gain.
Change to a suitable
Servomotor.
Replace the Servo
Motor.
Replace the Servo
Motor.
279