00196044-05 - sg x und x4i fse_en - 第352页

Twin Head Reference Run TWIN Head Assemblies S tudent Guide (FSE) SI PL ACE X Series and X4I T win Head Edition 01/2009 EN 352 9.2 Reference Run 9-5: Twin-head Z,D- axes The Twin-head consist of two segments which have 2…

Twin Head

TWIN Head Assemblies Overview

Student Guide (FSE) SIPLACE X Series and X4I

Edition 01/2009 EN Twin Head

351

9.1.2.1 Vacuum generator Twin- Head

9-2: Vacuum generator

The vacuum generator automatically controls the

vacuum, air blast and the zero balancing position

(middle position-->no vacuum and no air blast) for

the segments, with the aid of an iron core and

inductor.

Legend

1. Compressed air input

2. X series, D3: Cooling for X linear motor

D1: Discharged air to silencer

3. Output vacuum - vacuum is passed through

the D-axis motor shaft and then to the nozzle.

9-3: Principle of the vacuum generator

Legend

1. Compressed air input

2. Venturi nozzle

3. Plunger (iron core)

4. Plunger drive (inductor)

5. Discharged air to silencer

6. Vacuum air blast output

9-4: Filter for the vacuum system (example of Twin segment version 03

shown)

Legend

1. Filter for the vacuum system on the Twin-

head.

The Filter is mounted on the return unit and used

as an attenuator to control the vacuum. The filter

with the additional volume reduces the oscillation

of the vacuum generator and guarantees an

accurate vacuum and air blast supply. The filter is

serviced at regular intervals, which must be

adhered to (see maintenance guide).

Twin Head

Reference Run TWIN Head Assemblies

Student Guide (FSE) SIPLACE X Series and X4I

Twin Head Edition 01/2009 EN

352

9.2 Reference Run

9-5: Twin-head Z,D- axes

The Twin-head consist of two segments which

have 2 axes Z and D and the X and Y axes at the

Gantry.

Before you start the reference run the return

cylinder move out to the lower home position. On

both modules the vacuum is on, until the vacuum

generator is initialized.

Legend

1. Z axis incremental encoder

2. Z axis linear incremental scale

3. D-axis incremental encoder with incremental

glass scale

Twin Head

Reference run at Z axis Reference Run

Student Guide (FSE) SIPLACE X Series and X4I

Edition 01/2009 EN Twin Head

353

9.2.1 Reference run at Z axis

9.2.2 Reference run at D- axis

9-6: Reference run Z axis

Legend

1. Incremental scale mounted on moveable part

of the Z Axis

2. Fixed Incremental encoder

3. Zero puls on the incrementale scale (only one

for Z axis)

 Z Axis search for the commutation point of the

linear motors (in a special mode because of

the danger of a movement downwards). (A 3

phase motor continues to run at the correct

time and in the correct sequence, when the

current is switched from 1 phase to the next

one.)

 Then the Z Axis move upwards to the Zero

pulse and load the zero point correction.

 The zero point correction, max. and min. travel

range, are determined when you calibrate the

head height.

9-7: Reference run D-axis

Legend

1. Incremental glass scale D-axis

2. Incremental encoder

3. Zero pulse on the incremental glass scale

Then the D-axis (turning axis) executes the

reference run.

The D-axis runs to the zero pulse of the D- axis

encoder. The zero point correction value will be

loaded. The D-axis moves to the reference

position, in accordance with the prefix shown

before the value.

Reference run completed! This is followed by

the gantry reference run (see Section Gantry).