00197042-04_SM_X-Serie-S_Customer_EN.pdf - 第150页

6 Gantries 6.3 X and Y axis 150 Service Manual SIPLACE X-Serie S 06/2019 6.3.3 Mechanical adjustment of the incremental encoder The incremental encoders (read units) on the X and Y axis are adjusted exactly to the positi…

6 Gantries

6.3 X and Y axis

Service Manual SIPLACE X-Serie S 06/2019 149

Overview

Fig.184: Overview of incremental encoder

1. Incremental encoder (mounted on the

holder)

2. Holder

3. Fastening screws (3x) for holder

Fig.185: Overview of gantry interface

1. Gantry interface

2. Trailing cable holder on gantry

Removal

► Switch off the machine, disconnect it from the power supply and secure it to prevent

unauthorized reactivation.

1.2 "Preparatory work..." [}16]

► Unplug the incremental encoder cable from the gantry interface. In this case make a note of

the position to make clear assignment easier later on.

► Unthread the connection cable as far as the incremental encoder.

► Remove the three screws fastening the incremental encoder holder and carefully remove this

together with the incremental encoder.

Installation

► Clean the reading surface of the incremental encoder with a cloth and ethanol or with a Q tip.

► Fit the incremental encoder with the three fastening screws. To do this, place the thickness

gauge provided between the incremental encoder and the scale, so that there is a gap. This

gap must either be 0.4mm (golden scale) or 0.75mm (black-white). Use the corresponding

thickness gauge (plastic).

► Reconnect to the electricity supply.

CAUTION

Make sure that the cables do not rub against anything.

Make sure that the axes can be moved without damaging the cables.

► Fasten them with cable ties

► Check the track signals with the test device (see 6.3.8 "Track Signals and Zero

Pulse" [}153]).

6 Gantries

6.3 X and Y axis

150 Service Manual SIPLACE X-Serie S 06/2019

6.3.3 Mechanical adjustment of the incremental encoder

The incremental encoders (read units) on the X and Y axis are adjusted exactly to the position of

the incremental scale. The two limit marks on the incremental encoder show where the top/bottom

positions of the scale should be.

Set the incremental encoder mechanically to a distance of 0.75 mm to the incremental encoder.

NOTICE

Plastic disks

To set this distance, use one or more small plastic disks with a total thickness of 0.75mm.

► Feeler gauge 0.75mm plastic [03090774-xx]

After this adjustment of the incremental encoder you have to check the zero pulse and track sig-

nals.

Correct installation should ensure correct count and zero pulse signals. For troubleshooting pur-

poses (error analysis and fixing), you will need to measures these signals.

Please also observe section 6.3.8 "Track Signals and Zero Pulse" [}153].

6.3.4 Travel Ranges and Speed Monitoring

The travel range of the X and Y axes will be determined during machine calibration.

Fig.186: Travel range for X and Y axes (X series shown as

example)

1) to 4) = gantry 1 to 4

The end of the X axis travel range is + or -

0.5 mm before the software limit switch,

which is 1.5 mm before the buffer. A safety

distance of 2.0 mm to the buffer is adequate

if the X axis moves into this area with ex-

cessive speed.

The end of the Y axis travel range is + or -

2.0 mm before the software limit switch. The

Y axis travel range for a particular place-

ment area is monitored in one direction by

the software limit switch and a buffer. In the

other direction, there is a permanent ex-

change of communication between the axes

and their positions, via the SPI bus. (see

also 6.3.7 "Anticrash Function" [}152]).

6 Gantries

6.3 X and Y axis

Service Manual SIPLACE X-Serie S 06/2019 151

Fig.187: Travel range for X and Y axes (X series shown as

example)

1. Safety distance between the gantries

during placement: minimum 4mm.

Depending on the placement mode (I-place-

ment or alternating), the gantries will operate

in one placement area fully independently.

This means that one gantry does not need

to know the position of the other one.

6.3.5 Error "Gantry Crash"

A “gantry crash” error is established by calculating the position difference and speed difference for

both axes. A gantry crash error is signaled via the (M) GCUs and the CAN Bus. After the "gantry

crash" error message has been issued, both gantries need to be referenced.

6.3.6 Count Error

If the (M)GCU detects a "fatal count error", the axis concerned will be released and the anticrash

function disabled. The other axis is informed of this in the status information and will also disable

the anticrash function. The released axis now needs to be referenced again.

After this, the anticrash function will be re-enabled for both axes.