Omron CS1W-MCH71 MOTION CONTROL UNIT - 09-2004 Manual page 610

Troubleshooting
No. Problem
51 The motor axis is The gain adjustment is
vibrating insufficient. (The gain is too
unsteadily. low.)
52 The gain cannot be
adjusted because the
mechanical rigidity is too
weak.
53 The mechanical structure is
producing stick slip (high-
viscosity static friction).
54 The wrong Servomotor is
selected (so it cannot be
adjusted).
55 The Servomotor or the
Servo Driver is defective.
56 There is slip- The slippage is not con-
page in position- stant.
ing.
Malfunction due to noise.
57 The shield is not properly
grounded at the Servo
Driver.
58 The cable between the MC
Unit and the Servomotor is
too long.
59 The cable between the MC
Unit and the Servo Driver is
not separated from other
power lines.
60 There is malfunctioning
due to noise from a welding
machine, inverter, etc.
61 There is slippage in the
mechanical system.
62 Communica- There is incorrect connec-
tions Alarm is tion of communications
generated. cable between the MC Unit
and MLK devices.
63 The MC Unit The Servo Driver's setup
cannot receive parameters are not correct.
absolute data
(when an abso-
lute encoder is
used).
64 The absolute There is mechanical slip-
value read at page.
turning ON is dif-
65 The Servo Driver parame-
ferent from the
ter settings are not correct.
one at turning
OFF. (when an
absolute
encoder is
used).
Probable causes
This particularly tends to occur
in systems with vertical axes,
scalar robots, palletizers, and so
on, which place a torsion load
on the axes.
Check the torque and inertia
ratio and select another Servo-
motor.
Is specified cable being used?
Check the ground wiring.
Check whether the cable is sep-
arated from other power lines.
Check whether there is a device
such as a welding machine or
inverter nearby.
Check for slippage by marking
the mechanical connections.
Check the communications
cable connection and breaking
of wire.
Check whether the motor turns
while the power is OFF.
Check the Servo Driver parame-
ters.
Item to check
• Perform auto-tuning.
• Manually adjust (increase) the
gain.
• Increase the mechanical rigid-
ity.
• Re-adjust the gain.
• Perform auto-tuning.
• Manually adjust the gain.
Change to a suitable Servomo-
tor.
Replace the Servomotor or the
Servo Driver.
Use specified cable.
Correct the wiring.
The maximum cable length is 50
meters.
Separate the cable from other
power lines.
Separate the Unit from the
noise source.
Tighten the connections.
• Correct wiring of the communi-
cations cable.
• Replace the communications
cable.
W Series:
Turn Off (0) Servo Driver param-
eter Pn002 digit No.2.
Turn Off (0) Servo Driver param-
eter Pn000 digit No.0 of the
W ≅series
Section 11-1
Remedy
587