Omron CJ1W-C113 - REV 02-2008, Operation Manual

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Troubleshooting Tables Section 11-1
25 The origin estab-
lished by the origin
search sometimes
changes. There is some looseness in
couplings or other mechanical
connections. Check whether there is any devi-
ation from the markings at the
couplings between the motor
and axes, or at any other con-
nections. Tighten up the loose con-
nections.
26 There is no Z-phase margin.
There is no margin for the ori-
gin 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 cou-
pling 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 mechani-
cal 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 insuffi-
cient. --- Execute Servomotor
autotuning.
Manually adjust the Ser-
vomotor gain.
30 The wrong Servomotor is
selected (so it cannot be
adjusted). Check the torque and inertia rat-
ings and select another Servo-
motor. Change to a suitable Ser-
vomotor.
31 The Servomotor bearings are
damaged. Turn OFF the Servo Drive power.
If the Servomotor 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 Servomotor.
32 The Servomotor windings are
disconnected. With a tester, check resistance
between the Servomotor’s U, V,
and W power lines. There should
be a proper balance between the
line resistances. Replace the Servomotor.
No. Problem Probable causes Items to check Remedy