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Chapter 6 Nozzle Statistical Processing Part 2 6. Nozzle Statistical Processing The FCP IV -3 has a statistical processing function which monitors the number of nozzle errors that occur , and automatically skips any nozz…
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FCP IV-3 Operation
Chapter 6 Nozzle Statistical ProcessingPart 2
6. Nozzle Statistical Processing
The FCP IV-3 has a statistical processing function which monitors the number
of nozzle errors that occur, and automatically skips any nozzle that generates
errors frequently. This statistical processing function is called the nozzle skip
function.
6.1 Nozzle Skip Method
Nozzle skip can be set in Proper data. This function is effective for
detecting dirtied nozzles, or when there are too many rejected parts.
Nozzle skip can also be set manually, as described previously in this
manual. This is useful when there are dirty nozzles that the operator
already knows about.
6.2 Setting Nozzle Skip
If a nozzle becomes damaged during automatic operation so that it can no
longer be used, the nozzle can be automatically skipped without having
to interrupt production. This function is referred to as the nozzle skip
function.
6.2.1 Auto-skip
When there is a nozzle error (i.e. a picking error or vision
processing error), that nozzle will be declared inoperative and the
nozzle number will appear on the display monitor. In operation,
the total number of small, medium and large nozzles that are
defective, each have a limit below which the machine continues to
operate. The defective status of a nozzle can be cancelled manually
using the procedure described below.
6.2.2 Manual Nozzle Skip
Pressing the [SET], [MANUAL] and [NOZZLE SKIP] command
function keys in that order will either set or cancel the nozzle skip,
depending on the context of the situation. If, however, the nozzle
skip has been set manually it must be cancelled manually as well
and cannot be used again.
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Chapter 6 Nozzle Statistical ProcessingPart 2
6.2.3 Setting the Error Rate
This error rate determines when a nozzle will be skipped. For each
individual nozzle, the number of errors in the most recent 16
placements is counted and if this rate exceeds the error rate that has
been set then the nozzle will be skipped automatically. For
example, if this value is set at 1 and any one nozzle is defective
more than about 6% of the time (i.e. 1/16 of the time), that nozzle
will be skipped.
6.2.4 How to Set the Proper Data
The appropriate Proper data settings are shown below.
128 Skip Number: The number entered here will become the
error rate number described above.
129 Skip Nozzle S: This sets the maximum permissible number of
defective S nozzles.
130 Skip Nozzle M: This sets the maximum permissible number of
defective M nozzles.
131 Skip Nozzle L: This sets the maximum permissible number of
defective L nozzles.
6.2.5 Display Monitor
When nozzle skip and manual nozzle skip take place, information
on the skipped nozzles will be displayed on the screen.
The yellow display indicates a nozzle has been automatically
skipped and the blue display indicates a nozzle has been skipped
manually.
Skip Nozzle
S CEIL
M ADL
L BG
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FCP IV-3 Operation