Omron CJ1W-C113 - REV 02-2008 Operation Manual page 343

Troubleshooting Tables
No. Problem
53 There is slippage in
positioning.
54
55
56
57
58
59
60
61
62
63
64
65 Speeds drops (or
operation stops)
during continuous
operation
66 When memory
operation is tempo-
rarily stopped and
then restarted, it
starts from the
beginning again
(not from where
operation was tem-
porarily stopped)
316
Probable causes
The slippage is not constant.
Malfunction due to noise.
There was already slippage in
the position of the origin
before positioning was per-
formed.
The shield is not properly
grounded at the Servo Drive.
The PCU's output power sup-
ply is not separated from
other power supplies.
The cable between the PCU
and the Servo Drive is too
long.
Twisted-pair cable is not being
used for the pulse outputs.
The cable between the PCU
and the Servo Drive is not
separated from other power
lines.
There is malfunctioning due to
noise from a welding
machine, inverter, etc.
Output for operating com-
mands turns OFF during oper-
ation.
There is slippage in the
mechanical system.
The minimum operating time
(10 ms min.) is not achieved.
When operation is restarted,
the Sequence Number Enable
Bit is ON at the point when the
START Bit is turned ON.
Items to check
Is shielded cable being used?
Refer to 25 and 26.
Check the ground wiring.
Check whether the PCU's output
power supply is separated from
other power supplies.
-–-
Check whether twisted-pair
cable is being used for the pulse
outputs.
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 whether the Servo Drive's
operating command output sig-
nals are turning OFF during
operation.
Check for slippage by marking
the mechanical connections.
Calculate the movement time by
dividing the amount of move-
ment by the speed to check
whether operation is longer than
the minimum operating time.
Check the ladder program and
data trace.
Section 11-1
Remedy
Use shielded cable.
Refer to 25 and 26.
Correct the wiring.
Separate the PCU's out-
put power supply from
other power supplies.
Install a noise filter at the
primary side of the PCU's
output power supply.
Ground the PCU's output
power supply.
The maximum cable
length is two meters for
open collector output
models and five meters
for line driver output mod-
els.
Use twisted-pair cable for
pulse outputs.
Separate the cable from
other power lines.
Separate the Unit from
the noise source.
Turn ON the operating
command output signals
with the correct timing.
Tighten the connections.
Add the minimum operat-
ing time and other fac-
tors, and adjust the target
distance and speed so
that the movement time
will be greater than this
total.
Change the ladder pro-
gram so that the
Sequence Number
Enable Bit is turned OFF
when the START Bit is
turned on to resume
operation.