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2 Assembly Instructions for PCB Camera, Multicolor SIPLACE S-25 HM / S-27 HM 2.12 Illumination Setting 02/2007 Edition 84 2.12.2 Orient ation Aid for Selecting Illumination The following table is derived from empirical v…

SIPLACE S-25 HM / S-27 HM 2 Assembly Instructions for PCB Camera, Multicolor

02/2007 Edition 2.11 Safety Check: Shutdown of Illumination

2.11 Safety Check: Shutdown of Illumination

: In succession, activate again - as described above - visible camera illumination at each gantry

and, while the light is starting to flash ON, open a safety hood or a cover (PCB input / PCB

output):

: Check: The light must turn OFF when this occurs. This results from the interruption of the cur-

rent from the voltage regulator module (50 V) by the assemblied safety relay.

: If an error occurs, check and correct the wiring on the basis of the circuit diagrams

in Abschn. 2.13.

: Repeat this procedure with the key-operated switch in the normal position and in the service

position. The vision screen must remain DARK. Continue with the illumination setting.

2.12 Illumination Setting

: Adjust the illumination setting at the station to the current substrate to be placed, proceeding

as described below.

2.12.1 Possible Illumination Settings and Selection Criteria

The following types of illumination are possible with the PCB camera Multicolor by using the per-

tinent setting (see Abschn. 2.12.3): 2

– Standard light:

Using this mixture of white and IR light it is possible to recognize a broad range of fiducials. By

selecting special types of illumination, the contrast of the image can be improved and, as a

consequence, the range of recognizable fiducials increased.

– White light:

This is used for standard PCBs (tinned fiducials).

– Blue oblique illumination:

By using this light, an obvious improvement in contrast can usually be attained where bright

fiducials on a light base material are involved, e.g., on ceramic or CEM. In a few instances,

fiducials covered by solder resist can also be recognized better on a light background.

– IR light:

It is usually practical to use this type of illumination for fiducials that are covered by solder resist

or for fiducials on flex material. It may also be possible to improve recognition where silver-pla-

tinum fiducials on ceramic are involved. Ascertain this in advance by conducting a trial cen-

tering and/or a trial placement.

2 Assembly Instructions for PCB Camera, Multicolor SIPLACE S-25 HM / S-27 HM

2.12 Illumination Setting 02/2007 Edition

2.12.2 Orientation Aid for Selecting Illumination

The following table is derived from empirical values and is therefore only to serve as an orientation

aid. A few materials often exhibit very drastic fluctuations (particularly in the case of CEM1), the-

refore the best illumination has to be ascertained through testing. In each instance this is done by

selecting the setting for illumination during the course of a sample placement with recognition of

the position of the pertinent PCBs or ceramic substrates. 2

Base material Fiducial material Oblique illu-

mination

BLUE

Infrared

light

White light

FR 4 Tin x

Ceramic NiAu, Cu, AgPl x

Ceramic AgPt x

CEM1 Bright copper fiducials,

tin

CEM1 Fiducials covered by sol-

der resist

(x) x

Flex on alumi-

num carrier

SIPLACE S-25 HM / S-27 HM 2 Assembly Instructions for PCB Camera, Multicolor

02/2007 Edition 2.12 Illumination Setting

2.12.3 Setting the Illumination

The best illumination selection must be ascertained by using the function "Test fiducials" or the

substrate to be populated. 2

NOTE:

The processes which must be executed prior to setting the illumination are described in detail in

the section "Teaching Fiducials" or "Teaching Synthetic Fiducials" of the User Manual, Software

version SR 502.xx.

During them, the current substrate or PCB is moved onto the processing belt of the conveyor and

mechanically centered / clamped in place. 2

: Select the ICON "Setting illumination"

: In the "illumination" menu select the "Setting illumination" button.

The following screen will appear:

Fig. 2.12.1 Screen: "Setting the Illumination"

NOTE:

Utilize Abschn. 2.12.2 and the table in Abschn. 2.12.3 to select the best type of illumination. 2

: Select the desired illumination level by activating the pertinent radio button.

: Select the complete or the reduced brightness by activating or deactivating the rectangular

field.