00194614-08 Trainingsdoku. SG X-Serie_X4i SW70x (AL2)_EN.pdf - 第216页

C&P20A Parts Overview with Function Description Overview Student Guide SIPLACE X-Serie and X4I SW70x (AL2) 216 Component S ensor 7.2.3.4 Component Sensor The component sensor is a standard feature on the C&P20A h…

C&P20A

Overview Parts Overview with Function Description

215 Student Guide SIPLACE X-Serie and X4I SW70x (AL2)

Z Drive Function

Retract Unit

7.2.3.3 Retract Unit

Retract unit functions

At zero current, the bearing friction of the Z axis is not sufficient to protect the axis from falling down. A

pneumatic retract system has been installed to protect the Z axis should the gantry be moved when the

machine is switched off. This retract unit keeps the Z axis in the safe, upper position during zero current.

Legend

1. Raceway

2. Segment

3. Ball bearings

4. Light barrier down

5. Snap jaws

▪ The jaws are installed on the primary part of the Z

motor, for mechanical docking of the segments.

▪ A Z down sensor is located in the placement position,

for recognition of the Z axis put down position. This

recognizes a relative movement between the nozzle

and DP segment. When the Z axis springs into place,

this sensor sends a signal to the axis controller board.

The "light barrier down" signal is directly linked to the

measurement signal of the Z axis incremental

encoder.

Legend

1. Pneumatic cylinder

2. Solenoid valve

3. Compressed air connection

4. Retract unit fixtures

5. Z axis driver

The retract unit is installed on the Z axis and is

responsible for protecting the Z axis from damage, by

moving it into a safe area in the case of unexpected

events e.g. power cuts or machine shutdown.

The retract unit is fixed with two screws and can be easily

replaced during service work.

C&P20A

Parts Overview with Function Description Overview

Student Guide SIPLACE X-Serie and X4I SW70x (AL2) 216

Component Sensor

7.2.3.4 Component Sensor

The component sensor is a standard feature on the C&P20A head and no longer an option as in the DLM

heads. Also, the function and position of the component sensor is different to that for the DLM heads.

The component sensor is in the pickup/place position and the Z axis moves during the upwards and

downwards movement of the laser beam. If the laser beam is interrupted or when it is released again,

the exact Z axis position is read out and the corresponding evaluation started.

(Before pick up: no component on the nozzle, after Pick up: component on the nozzle;

placement: component still on the nozzle, after placement: no component on the nozzle)

NOTICE

The Z axis control system is designed to ensure that, should the machine power supply fail (or

be switched off), there is always enough power temporarily stored by the Z motor servo unit and

axis controller board to move the Z axis to the upper position.

Power failure is recognized by the issuance of a "Power fail" signal. This "Power fail" signal

enables the relevant function (upwards movement and activation of the retract unit) on the axis

controller board.

Component sensor

▪ The component sensor is installed in the pickup-

placement position on the C&P20A head, by default.

▪ The sensor is fixed to the head with two screws and

can be replaced as a complete unit during service

work.

Legend

1. Power/data supply cable

2. Transmitter and receiver unit

3. Laser beam

4. Fixture to housing

C&P20A

Overview Parts Overview with Function Description

217 Student Guide SIPLACE X-Serie and X4I SW70x (AL2)

Component Sensor Functions

Pickup Process:

When the Z axis moves downwards, the nozzle interrupts the laser beam. At this exact moment, this Z

axis position is read out and compared to the reference value, from the height reference run, or from this

segment after placement. This determines whether there is still a component on the nozzle or not. If the

Z axis position indicates that there is a component on the nozzle, the Z axis will be immediately stopped.

An error message will appear or the component will be rejected and added to the repair cycle as not

placed.

When the Z axis moves upwards again, the laser beam is released and the Z position read out. Based

on the Z position during downwards movement, the system can now determine the presence and height

of a component.

Placement Process:

During the placement process, the system checks whether the component is at the nozzle (Z downwards

movement) or whether placement has been performed on the component (Z upwards movement). As a

precaution, these Z positions are compared to those from the pickup procedure.

This ensures maximum pickup and placement reliability.

Legend

1. Downwards (top diagram) or upwards (bottom

diagram) movement

2. Nozzle

3. Component

4. Reading out the Z position, if the laser beam is

interrupted (top diagram) or has been released again

(bottom diagram).

The component sensor signal is directly linked to the axis

controller (measurement system) of the Z axis. This

enables you to read out the Z position during upwards

and downwards movement.