SM482PLUS_Admin(Eng_Ver2.8).pdf - 第126页
6-8 Multi-Functional Placer SM482( L) PLUS Administrator’s Guide 1) When part placement is possible but placement accuracy is poor At least two fiducial marks are required within a placement area, but if there is only a …
6-7
Board Definition
Caution Restrictions Related to Long PCB Production (Conditions of
the PCB for Two-level Placement)
In this equipment, the two-level placement is only available
for single conveyors with a length of 1,200mm, and a PCB
is defined as a long PCB when its length is between 610 ~
1,200mm.
In order to place parts on a long PCB, parts must be placed
in two steps by dividing the corresponding PCB into two
placement areas.
Also, at least two fiducial marks must exist in each
placement area and at least one fiducial mark must exist at
the location where the two areas intersect.
If Array / Block / Bad / Accept / Model marks are used for a
long PCB, the machine may not place parts on the
corresponding PCB according to the PCB condition.
Therefore, the user must understand the restrictions related
to the long PCB.
For reference, the figures used in the following cases are all
based on the PCB flow of the conveyor going from ‘Left ->
Right’.
6-8
Multi-Functional Placer SM482(L) PLUS Administrator’s Guide
1) When part placement is possible but placement accuracy is poor
At least two fiducial marks are required within a placement area,
but if there is only a single fiducial mark within a placement area,
this equipment can use the fiducial mark to calibrate just the X
and Y coordinates, but cannot calibrate the theta coordinates.
Therefore, the two or three-level placement method is not
recommended for IC parts, which require a high level of
accuracy.
When the array or block fiducial mark is overlapping across
two placement areas
When there are only two panel fiducial marks
6-9
Board Definition
2) When part placement is not possible
When there is a bad/accept mark or a 2D barcode in the
second placement area
If the bad/accept mark or the 2D barcode cannot be
recognized in the first placement area, you cannot use the
bad/accept mark or the 2D barcode.