Panasonic LP-S Series Maintenance Manual page 155

„ Moving objects
Troubles
Marking cannot be done.
Marking is sometimes
skipped.
(E800 occurs.)
Characters unreadable
Marking position is
unstable.
Marking character pitch
is unstable.
Character is partially
chipped.
Causes
Encoder signal is off.
Marking trigger signal is entered
before current marking is
finished.
Feed direction is not correct.
Speed changes at conveyor
junction.
Actual speed and preset speed
for feeding objects are different
due to slippage of objects.
Pulse setting of encoder is not
correct.
Encoder is out of order.
Positional misalignment is likely
to occur due to meandering
motion of conveyor.
The line speed at the marking
position is different from the
speed at the installation site of
the encoder.
Obstacle hinders laser beam.
For LP-M series:
The marking target object
movement timing is not
synchronized with the
displacement sensor trigger
output timing.
For LP-M series:
Output signal of the
displacement sensor is not
stable.
ME-LPS-SSM-8
Measures
Check for proper connection to encoder.
• Increase scan speed setting of laser marker.
• Decrease delay distance setting of laser marker.
• Reduce feeder speed.
• Increase marking interval (interval between objects on
feeder).
Match feed direction with laser marker operation.
If conveyors are coupled, avoid marking near conveyor
junction.
Remove cause of object slippage.
Measure the number of encoder pulses and adjust
"Number of encoder pulses".
Check encoder for proper function.
Secure objects to prevent misalignment.
Place the encoder as close as possible to the marking
position.
Decrease the encoder resolution to block the effect of
the line speed fluctuation.
Note that the minimum value of the encoder pulse should
be 10 P/mm.
Remove obstacle between head of laser marker and
object.
Confirm the displacement sensor detection position and
the displacement sensor trigger timing.
Confirm the displacement sensor specifications and
match the signal output timing to the marking trigger
signal timing.
Confirm the installation status and check if the
displacement sensor is receiving the impact of vibration
or the like.
Confirm the output signal of the displacement sensor to
check if it is being affected by noise.
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