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2 Safety 2.7 Lock out and tag out procedure Instruction manual ASM ProcessLens 03/2021 43 2.7.4 Responsibility and obligations ● It shall be the responsibility of the maintenance and service personnel to make sure this p…

2 Safety

2.7 Lock out and tag out procedure

42 Instruction manual ASM ProcessLens 03/2021

2.7.2 Description

Whenever it becomes necessary to isolate, control and release energy, the following procedure is

to be followed:

► Notify affected employees.

► Shut down the equipment. Carry out all normal stopping procedures:

– Press the Stop button,

(see fig. "Position of buttons and switches" [}36]).

– Switch off the ASM ProcessLens inspection software.

– Shut down the control computer.

– Switch the machine off at the main power switch (see fig. "Position of buttons and

switches" [}36]).

► Isolate the machine from all its energy sources:

– Disconnect the main power connection.

► Lock out the machine:

– Attach a lock whenever possible (e.g. to the main power switch).

NOTICE

Alternatively: Tag out procedure

If a machine can be locked out, it must be. However, there are situations where energy isol-

ating devices cannot accommodate locks. In these cases, the energy isolating devices

must be tagged to warn employees that the machine is de-energized for servicing. The tag

must be securely fastened, it must be placed in a position visible to all and it may only be

removed by the person who attached it.

► Release stored energy:

Stored energy in the electrical energy in electrolytic capacitors must be released by appro-

priate means.

– After switching off the machine, wait the specified discharge time (see sections 2.6 and

2.7), before the machine can be operated again without risk.

► Verify the lock out:

Testing the lock out can be done simply by pressing the start button.

► The following steps must be taken to restore the machine to operation:

– Check the area. Authorized employees should remove all of their tools and reinstall all

guards.

– Notify all affected employees.

– Before removing even one lock or tag, inform all workers in the area that the machine is

going to be restarted.

– Remove locks/tags

– Each authorized employee must remove his or her own lock. Each authorized employee

will have his or her own lock.

– Turn the machine on. Authorized workers should observe the equipment in operation to

ensure repairs were done correctly.

2.7.3 Testing

Service personnel may test the circuits by activating them briefly without canceling the locking

method. This may be done only when no other work is being performed by any other person on the

equipment being tested.

It is extremely important that all remote start switches be tagged with the Do Not Operate tag to

prevent inadvertent operation of the equipment during these periods.

2 Safety

2.7 Lock out and tag out procedure

Instruction manual ASM ProcessLens 03/2021 43

2.7.4 Responsibility and obligations

●

It shall be the responsibility of the maintenance and service personnel to make sure this pro-

cedure is adhered to.

●

It shall be the responsibility of the maintenance and service personnel’s immediate supervisor

to instruct his personnel on this procedure.

●

It shall be the responsibility of the Safety Officer with assistance from the Safety Committee,

Health Service Department, and the various managers and Vice-presidents to administer the

lock out/tag out procedure.

2.7.5 Training

●

Staff training:

– The safety regulations require training for every individual. Of course, not every employee

is exposed to the same degree of danger or is involved with lock out/tag out as others are.

So extensive training is not necessary for everyone.

– To determine how much training to provide for each worker, the employees are divided into

three groups. Each group has its own level of training.

●

Authorized employees:

– These workers actually install the locks and tags and do the preventive maintenance or

service work. So they must know the most about controlled energy. First, they must be

able to recognize all energy sources and measure the amount of energy. Authorized em-

ployees must look for energy sources out of the realm of the obvious. These energy

sources include electrical, mechanical, hydraulic, pneumatic, chemical, thermal and gravit-

ational. Once these workers can recognize all energy sources they must be taught how to

isolate, control, and release the energy without any risk.

●

Affected employees

– These are workers who operate the machinery or equipment that may be de-energized.

Other employees who may be affected include those who work in an area that contain

equipment that may be locked/tagged out. These employees have to be instructed about

the nature of the energy control program. They must know why lock out/tag out is import-

ant, what tags and locks look like and why they must not remove tags or locks.

●

All others

– As the name implies, any employee who is not affected or authorized fits into this category.

These employees include office personal, managers, and upper management. Although

they do not have a direct relationship to the machinery being locked or tagged, they have

to receive some training.

– To evaluate the lock out/tag out procedure, the safety department will conduct periodic in-

spections. As part of the inspection the safety department will document that all facets of

the procedure are followed. The safety department will follow up with formal classroom re-

view or retraining of the lock out/tag out procedure.

2.7.6 Review

This procedure will be reviewed and amended as required, and at least once a year.

2 Safety

2.8 ESD guidelines

44 Instruction manual ASM ProcessLens 03/2021

2.8 ESD guidelines

2.8.1 What does ESD mean?

Fig.32: ESD label

Almost all of the modules in use today are equipped with highly integ-

rated Metal-Oxide-Semiconductor (MOS) blocks and components.

The manufacturing techniques used mean that these electronic com-

ponents are extremely sensitive to overvoltage and thus to electro-

static discharge.

The abbreviation for such modules is "ESD" (Electrostatic Sensitive

Device). "ESD" is used internationally. The following symbol on cab-

inet rating plates, racks or packaging indicates that components

which are sensitive to electrostatic discharge have been used and

thus that the modules concerned are also touch-sensitive.

ESDs can be destroyed by voltages and power levels that are far below the level that can be per-

ceived by humans. Such voltages occur if a person touches a component or module without

earthing themselves. Components that are exposed to such overvoltages do not generally appear

to be defective immediately - incorrect behavior starts after the component or module has been in

operation for some time.

2.8.2 Important measures to protect against static charging

► Most plastics can easily become charged and must therefore be kept away from at-risk com-

ponents.

► Always ensure that people, the workplace and packaging are safely earthed when handling

electrostatic sensitive components.

2.8.3 Handling ESD modules

As a general rule: Only touch electronic modules if you must carry out work on the modules. In that

case, make sure that you do not touch the pins or printed conductors when you pick up flat mod-

ules.

Only touch components if you are earthed by one of the following measures:

●

You are wearing an ESD wristband.

●

You are wearing ESD shoes.

●

You are wearing ESD shoe earthing strips on an ESD floor.

Immediately before you touch an electronic module, discharge your own body by touching a con-

ductive and earthed object (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 move the assemblies near to data view devices, monitors or television units. Keep a min-

imum distance of 10 cm to monitors.

2.8.4 Measurements and modifications to ESD modules

Only perform measurements on modules if one of the following conditions is fulfilled:

●

You are using an earthed measuring device (e.g. via PE conductors).

●

You are using a potential-free measuring device and discharge the measuring head before

the measurement (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.