0197787-01_UM_HeadVerification_708_EN - 第69页

SIPLACE Head V erification User Manual Edition 01/2015 69 6. The Z axis is in the bot tom position, so that th e nozzle tip stands in the com ponent sensor beam. 7. During the rotation, m easurem ents are taken at each r…

SIPLACE Head Verification

User Manual Edition 01/2015

4.13 "ZDS Sensor Values" Measurement

The following tools are required for these measurements:

CP20P: 20x nozzle type 4069 03106244-01 (vacuum nozzle red, closed)

4.13.1 Explanation of Measurement – Procedure

The "ZDS sensor values" measurement determines the functionality of the Z-down light barrier and the

component sensor, in accordance with the rotary angles of the DP or segment.

Firstly, the reference run is applied to determine the brightness adjustment for the Z-down light barrier

(LED Gain). In relation to this, the voltage value is determined for the Z-down light barrier, which

provides a reference value (Sensor value [mV]) for the distance to the switching ring.

Additional measurements are performed to determine the Z-down light barrier voltage values when the

switching ring issues the Z axis end position signal during placement (Spring resp. low [mV]) and

also when the Z axis makes contact at full force (Spring resp. high [mV]), corresponding to a

complete compression of the segment spring.

In further tests, the rotary axis of the DP / segment is rotated by a full rotation (360°). During this, the

Z-down light barrier voltage values are constantly recorded and an image recorded of the distance

from the Z-down light barrier to the switching ring. The changes in voltage are measured in steps of

5°, to prove a relatively even fluctuation. The entire change in voltage is also determined over the

complete 360°.

As this measurement is performed in the component sensor area, the changes in nozzle tip length can

be measured across the entire 360°. These changes in length are recorded in steps of 5° and must

remain within a certain range.

The results of these measurements provide feedback about the following sources of errors:

1. Swaying switching rings

2. Dirty switching rings

3. Defective Z-down light barrier

4. Defective segment spring

Measurement steps:

1. Firstly, a height reference run is performed with the nozzle 4069.

2. Then a brightness adjustment for the Z-down light barrier LED is performed. This involves the

star rotating each segment into the placement position and switching the Z-down light

barrier.The voltage value determined at the segment setting 0° provides the value Sensor

Value [mV] which illustrates the distance between the Z-down light barrier and the DP

switching ring. The LED gain value is also determined. This is the brightness adjustment for

the LED in the Z-down light barrier, which returns during light barrier referencing. There is a

relationship between the brightness LED gain (transmitter) and the Sensor Value [mV]

(receiver), which shows the basic functionality of the Z-down light barrier.

This is performed separately for all segments.

3. Then segment 1 is moved downwards by the Z axis, with a segment setting of DP 0°.

For this, the Z axis is moved downwards to the height reference run position, using the travel

profile TP13 [TP13 NOZZLE CHANGER DOWN]. As soon as the DP switching ring has

triggered the Z-down light barrier, the voltage value for the Z-down light barrier Spring resp.

low [mV] is determined. The axis moves downwards at full force, until the current sensor of

the Z axis issues the end position signal. The segment spring is now fully compressed. The

voltage value for the Z-down light barrier Spring resp. high [mV] is now determined

again.This measurement is used to provide information about the switching ring and the linear

guide of the segment.

This is then performed separately for all segments.

4. Segment 1 is rotated into the placement position.

5. Segment 1 is rotated by 360° (step size 1°).

SIPLACE Head Verification

User Manual Edition 01/2015

6. The Z axis is in the bottom position, so that the nozzle tip stands in the component sensor

beam.

7. During the rotation, measurements are taken at each rotated 1°:

- Voltage value for Z-down light barrier (sensor value [mV] / 1°)  Min value [mV]

and Max value [mV]

- Change in nozzle length in component sensor (change in length determined / 5°

 Radial runout 5° [µm])

- Change in voltage for Z-down light barrier (sensor value [mV]/5°  Variation 5°

[mV]

- These saved values are used to determine the maximum voltage fluctuations of

the Z-down light barrier during a 360° rotation. This is provided by the delta

between the maximum voltage value and the minimum voltage value for the Z-

down light barrier  Variation 360° [mV]

- The saved values can also be used to determine the maximum change in nozzle

length for the component sensor measurement during a 360° rotation. This is

provided by the delta between the maximum nozzle length and the minimum

nozzle length in the component sensor across 360°  Radial runout 360° [µm]

8. This measurement is now performed for all other segments.

4.13.2 Explanation of Measurement Results in "Progress" Menu

After completion of the measurement, the following results appear in the "Progress" menu:

Figure 47: ZDS sensor values_1 results

SIPLACE Head Verification

User Manual Edition 01/2015

Figure 48: ZDS sensor values_2 results

Legend:

1. Segment measured

2. Analog voltage value for the Z-down light barrier receiver Sensor value [mV] at a segment

setting of 0°, during the LED brightness adjustment as receiver (4) with the value LED gain.

This voltage value shows the distance between the light barrier and the switching ring at a DP

setting of 0°. A type of light-dark determination (adjustment) is performed. This value must be

within a plausible tolerance (in our example 2000..5000mV)!

3. Lowest analog voltage value determined Min value [mV] for the Z-down light barrier during a

complete rotation of the segment by 360°. This value illustrates the largest distance between

the Z-down light barrier and the switching ring. You can also say that the light of the light

barrier is darker when the distance is greater. This value must be within a plausible tolerance

(in our example 2000..5000mV)!

Highest analog voltage value determined Max value [mV] for the Z-down light barrier during a

complete rotation of the segment by 360°. This value illustrates the smallest distance between

the Z-down light barrier and the switching ring. You can also say that light of the light barrier is

brighter when the distance is smaller. This value must be within a plausible tolerance (in our

example 2000..5000mV)!

4. Brightness value for Z-down light barrier LED (transmitter) during referencing. The LED gain

reflects the brightness of the LED which must be shown in the result of the Z-down light barrier

measurement Sensor value [mV] (2). The LED gain value must be within a plausible

tolerance (in our example 90..200).

5. The Spring resp. low [V/m] value describes the analog voltage value for the Z-down light

barrier, when the Z axis moves towards the conveyor edge, at a DP angle of 0°, and the light

barrier is switched by the switching ring. This value also stands for the distance between the

Z-down light barrier and the switching ring at this point, when the spring force is applied to the

switching ring. This value must be within a plausible tolerance (in our example -5300..-

2000V/m)!

6. The Spring resp. high [V/m] value describes the analog voltage value for the Z-down light

barrier, when the Z axis moves towards the conveyor edge with full force, at a DP angle of 0°,

and the segment spring is fully compressed. This value stands for a distance between the Z-

down light barrier and the switching ring at this position, when maximum force is applied to the

segment by the Z axis. This distance between the Z-down light barrier and the switching ring

is determined here.This value must be within a plausible tolerance (in our example -5600..-

3600V/m)!

7. The Radial runout 5° [µm] value describes the highest change in nozzle length determined

during segment rotation across 360° in a 5° area. The Radial runout 5° [µm] value specified

is the largest change in nozzle length which can be identified within a rotation of 5°. This value

must be within a plausible tolerance (in our example 0..20µm)!