CAN Bus Workshop_Version 03__06-2008_EN.pdf - 第23页

1 - 15 S tudent Guide CAN BUS W orkshop Edition 06/2 008 1 Operat ional safety 15 Fig. 1.3 - 4 Safety circuits Start button pressed Compressed air min. 0.5 MPa (5.0 bar)? No Emerg. stop push-button pressed? Protective co…

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Student Guide CAN BUS Workshop

1 Operational safety Edition 06/2008

1.3.3 Safety circuit and signaling circuit

1.3.3.1 Description of the functions of the safety circuit

The following conditions must be fulfilled in order to start and operate the placement machine:

– all four component trolleys must be docked in and connected.

– all covers - four over the gantries, one over the PCB input belt and one over the output belt -

must be closed.

– both emergency stop push-buttons must be released.

– the cover flaps (option) over the feeders must be closed.

– the minimum operating pressure must have been reached.

– the "software enable" signal must be active. This ensures that the safety circuit is closed.

– the power supply must be sending 24 V to the Start buttons and the protective contactor com-

bination.

– If one of the Start buttons is now pressed, the protective contactor combination PCC K6 will

switch and activate the following components:

– 250 VDC link voltage for the servo amplifiers for the gantry axes

– 145 VDC link voltage for the star axes

– the axis unit receives a "Servo Enable" signal for the servo amplifier

– 34 VDC operating voltage is switched to the component trolleys.

– 24 VDC operating voltage is switched to the used tape cutters.

– the PCB conveyor control receives the enable signal for the PCB clamping, the PCB stop-

per and the lifting table control.

The machine is then ready for use.

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Student Guide CAN BUS Workshop

Edition 06/2008 1 Operational safety

Fig. 1.3 - 4 Safety circuits

Start button pressed

Compressed air

min. 0.5 MPa

(5.0 bar)?

Emerg. stop

push-button pressed?

Protective cover open ?

Safety mode

activated on the user

interface?

Component

trolley safety circuit

interrupted?

Yes

Active

PCC*) Yes

Voltage

Y axis 250 V-

X axis 250 V-

star axis 145 V-

DP axis/D-Twin 40 V-

Z axis/Z-Twin 40 V-

Active

PCB conveyor Yes

Lifting table Yes

PCB clamping Yes

Width adjustment Yes

Laser light barrier Yes

Tape cutter Yes

CO trolley dock. unit Yes

Yes

Active

PCC*) No

Voltage

Y axis 0 V

X axis 0 V

star axis 0 V-

DP axis/D-Twin 40 V-

Z axis/Z-Twin 40 V-

Active

PCB conveyor Yes

Lifting table No

PCB clamping No

Width adjustment Yes

Laser light barrier No

Tape cutter No

CO trolley dock. unit Yes

Active

PCC*) No

Voltage

Y axis 0 V

X axis 0 V

star axis 0 V-

DP axis/D-Twin 40 V-

Z axis/Z-Twin 40 V-

Active

PCB conveyor No

Lifting table No

PCB clamping No

Width adjustment No

Laser light barrier No

Tape cutter No

CO trolley dock. unit No

*) PCC protective contactor combination K6

Yes

Start button pressed

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Student Guide CAN BUS Workshop

1 Operational safety Edition 06/2008

1.4 ESD guidelines

1.4.1 Handling ESD modules

Do not touch electronic modules unless it is absolutely essential to do so in order to carry out other

work. If it is necessary, make sure that you do not touch the pins or printed conductors when you

pick up flat modules.

Do not touch components unless

➠ you are constantly earthed by an ESD wrist strap or

➠ you are wearing ESD shoes or ESD shoe earthing strips on an ESD floor.

Always discharge yourself before you touch an electronic module. To do this, simply touch a con-

ductive and earthed object immediately before you touch the module (such as unpainted parts of

a switch cabinet, a water pipe, etc.).

Do not allow modules with chargeable and highly insulating materials to touch one another, e.g.

plastic films, insulating table surfaces or items of clothing made from synthetic fibers.

Always place the modules on a conductive surface (table with an ESD coating, conductive ESD

foam, ESD bag or container).

Do not bring modules near visual display units, monitors or televisions. Keep them at least 10 cm

away from the screen.

1.4.2 Measurements and modifications to ESD modules

Do not take measurements on such modules unless

– the measuring device is earthed (e.g. via PE conductors) or

– you discharge the measuring head just before taking measurements with a potential-free mea-

suring device (e.g. by touching an unpainted metal part of the controller casing).

➠ Always use an earthed soldering iron if you carry out any soldering work.

1.4.3 Dispatching ESD modules

➠ Always store modules and components in conductive packaging (e.g. metallized plastic bags

or metal sleeves) and dispatch them in conductive packaging.

If the packaging is not conductive, place the modules in a conductive envelope before packag-

ing. (Use ESD bags, domestic aluminum foil or paper, for example. NEVER use plastic bags

or film). 1

➠ If the module has integral batteries, ensure that the conductive packaging does not touch or

short-circuit the battery terminals and, if necessary, first cover the terminals with insulating tape

or material.