KE-750_MAINTE.pdf - 第138页
- 135 - 6. Problems caused by XY axes Symptom Cause Remedy There is an offset in XY axes. (Entire board) This is caused by damping when the XY axes stop. In this case, there is no tendency in the mounting offset. It is a…
- 134 -
Symptom Cause Remedy
There is an
offset in XY and
θ axes. (Entire
board)
The ejector is faulty, and this causes
insufficient vacuum value. When vacuum
value decreases, there is an weakness in
part pick. The part falls down or there is
a slip between the part and the nozzle in
the θ rotation during laser measurement,
resulting in in accurate mounting.
Connect the outlet of the ejector to
the pressure sensor. If the
vacuum pressure is less than -600
mmHg, replace the ejector.
There is an
offset in XY and
θ axes. (Entire
board)
This is caused by the faulty vacuum
solenoid. When vacuum destruction for
mounting, the vacuum solenoid may not
work, or there is a delay in its operation,
the vacuum is not destroyed, and the part
is picked by vacuum.
Check the function of the solenoid
valve by manually turning on and off
the vacuum. If there is a problem,
replace the vacuum solenoid.
There is an
offset in XY and
θ axes. (Entire
board)
This is caused by the blow solenoid. The
vacuum destruction by blow during
mounting is not correctly performed, and
the part is picked by the remaining
pressure of the vacuum pressure.
Check the function of the solenoid
valve by manually turning on and off
the blow solenoid. If there is a
problem, replace the blow solenoid.
Check at the same time that there is
no leakage in the positive pressure
when the blow solenoid is turned
off.
There is an
offset in XY and
θ axes. (Entire
board)
This is caused by clogging of the union
filter. The part is picked at vacuum by the
remaining pressure of vacuum pressure
when vacuum destruction for mounting.
With the vacuum set to on, check
the negative pressure at the
entrance and the exit of the union
filter. If there is a difference,
replace the union filter.
There is an
offset in XY and
θ axes. (Entire
board)
This is caused by low vacuum value
resulted from clogging of air tube.
Check that there is no clogging from
the ejector to the rotary block. In
particular, check that the holding
part of the tie-up band.
There is an
offset in XY and
θ axes. (Entire
board)
This is caused by leakage of the vacuum
resulted from deterioration in the oil
sealing in the rotary block of the head.
With the nozzle attached, stop the
tip with finger and check the
vacuum value. Then, compare this
vacuum value with that when the tip
of the air tube connected to the
rotary block is stopped. If there is
an air leakage, replace the rotary
block or the Z slider shaft.
- 135 -
6. Problems caused by XY axes
Symptom Cause Remedy
There is an
offset in XY
axes. (Entire
board)
This is caused by damping when the XY
axes stop. In this case, there is no
tendency in the mounting offset. It is at
random.
Check that the XY gain for the servo
driver has been correctly entered.
Then, perform production by
entering 100 ms for all 0 to 9 pages
of [0] to [5] of wPlcdmpg at 1. High
speed of 7. XY. If recovered, the
problem is related to damping, and
check the tension of the timing belt.
(See QA table: XY No.1.) (See
QA table: Electrical No.2.)
7. MS parameters entered
Most of MS parameters of the head and the VCS affect the mount accuracy.
Therefore, if there is an offset, it is necessary to check how it occurs with which
head.
Symptom Cause Remedy
There is an
offset in XY axes
in laser
recognition
mounting.
(Entire board)
This is caused by an offset of the laser
center of the laser offset. In this case,
the offset is not not random for all
placement angle but there is a tendency in
specific placement angle. The
displacement in XY axes direction differs
between 0 to 180° and 90 to 270°.
Re-enter the laser center offset of
the laser offset, and re-obtain the
head offset.
There is an
offset in XY axes
in laser
recognition
mounting.
(Entire board)
This is caused by the head offset. In this
case, disregarding the placement angle
and position, offset occurs always in the
same direction.
Re-obtain the head offset. Check
the entered value of the overall
placement offset after execution. If
a larger value has been entered,
record the value and set it to 0.
There is an
offset in XY and
θ axes in laser
recognition
mounting.
(Entire board)
This is caused by incorrect input of the
overall placement offset. If maintenance
of the head part which affect the accuracy
(head replacement, or Z slider shaft
replacement) was performed in the past,
the input value of the overall placement
offset changes. Accordingly, if a larger
value still remains, it affects.
Check the entered value of the
overall placement offset. If a larger
value has been entered, record the
value and set it back to 0. Or,
measure the offset with the camera,
and enter the correct value.
There is an
offset in XY and
θ axes in laser
recognition
mounting.
(Entire board)
This is caused by incorrect input of the
board height of the laser offset. If the
entered value is higher than the board
surface, the part falls down when
placement, and the offset of the placement
is at random.
Re-enter the board height of the
laser offset.
- 136 -
Symptom Cause Remedy
There is an
offset in XY and
θ axes in laser
recognition
mounting.
(Entire board)
This is caused by incorrect input of the
laser height of the laser offset. This
affects the laser measurement height, and
the measured result is at random.
Re-enter the laser height of the
laser offset. After entered, perform
nozzle assignment of setup for all
nozzles.
There is an
offset in XY and
θ axes in vision
recognition
mounting.
(Entire board)
This is caused by an offset of the
mounting angle or position of the camera
installation of the VCS camera offset. In
this case, the offset is not not random for
all placement angle but there is a
tendency in specific placement angle.
The displacement in XY axes direction
differs between 0 to 180° and 90 to 270°.
Re-obtain the installation position
and angle of the camera, and carry
out the overall offset of the VCS
placement.