HS50的结构及原理.pdf - 第58页
2 Operational Safety Adjustment Instructions SIPLACE HS-50 2.7 ESD Guidelines Edition 05/00 58 (6'* XL GHOLQ HV :KDW'RHV (6'0HDQ" Almost a ll of the m odules i n use toda y are equipped …
Adjustment Instructions SIPLACE HS-50 2 Operational Safety
Edition 05/00 2.6 Locking Up of Machine and Tagging of Warn Signs
57
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(1)Employee training
The safety regulations require training for everyone, even if not all employees are exposed to
the same degree of danger or are involved with LO / TO as much as others are. So extensive
training is not obligatory for everyone.
(2)To determine how much training is necessary, we divide employees into three groups.
Each group has its own level of training.
(3)Authorized employees:
These workers actually install the locks and tags and do the maintenance or service work. So
they must know the most about controlled energy. First, they must be able to recognize all
energy sources and to measure the amount of energy. Authorized employees must look for en-
ergy sources out of the realm of the obvious. These energy sources include electrical,
mechanical, hydraulic, pneumatic, chemical, thermal and gravitational energy. Once these
employees can recognize all such energy sources they must be taught how to isolate, control,
and release the energy without any risk.
(4)Involved 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. These employees have to be instructed on the nature of the energy
control program, they must know why locking / tagging is important, what tags and locks look
like and why they must not remove tags or locks.
(5)All others
As the name implies, any employee who is not affected or authorized fits into this category.
These employees include office personnel, engineers, managers, and high level management.
Although they are not directly involved with the system and the machinery being locked or
tagged, they have to receive some training.
(6)To evaluate the lock / tag procedure, the safety department will conduct periodic inspections.
As part of the inspection, the safety department will document if all aspects of the procedure
are followed. The safety department will follow up with a formal review or retraining of the
LO/TO procedure.
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This procedure will be reviewed and amended as required, but in any case at least once a year.
2 Operational Safety Adjustment Instructions SIPLACE HS-50
2.7 ESD Guidelines Edition 05/00
58
(6'* XL GHOLQ HV
:KDW'RHV(6'0HDQ"
Almost all of the modules in use today are equipped with highly integrated MOS blocks and
components. The manufacturing techniques used mean that these electronic components are
extremely sensitive to over voltage and thus to electrostatic discharge.
The abbreviation for such modules is ’ESD’(Electrostatic Sensitive Device). This is used interna-
tionally, although the German abbreviation ’EGB’ may also be seen.
The following symbol on cabinet rating plates, racks or packaging indicates that components
which are sensitive to electrostatic discharge have been used and thus that the modules con-
cerned are also touch - sensitive.
ESDs can be destroyed by voltages and power levels that are far below the level
that can be perceived by humans. Such voltages occur if a person touches a com-
ponent or module without earthing themselves. Components that are exposed to
such over voltages do not generally appear to be defective immediately - incorrect
behavior starts after the component or module has been in operation
for some time.
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Å Most plastics can easily become charged and must therefore be kept away from at - risk
components.
Å Always ensure that people, the workplace and packaging are safely earthened when handling
electrostatic sensitive components.
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Å Do not touch electronic modules unless it is absolutely essential to do so in order to carry out
other work.
Å If it is necessary, make sure that you do not touch the pins or printed conductors when you pick
up flat modules.
Å Do not touch components unless
Å you are constantly earthed by an ESD wrist strap or
Å you are wearing ESD shoes or ESD shoe earthing strips on an ESD floor.
Adjustment Instructions SIPLACE HS-50 2 Operational Safety
Edition 05/00 2.7 ESD Guidelines
59
Å Always discharge yourself before you touch an electronic module. To do this, simply touch a
conductive and earthed object immediately before you touch the module (such as unpainted
parts of a switch cabinet, a water pipe, etc.).
Å 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.
Å Always place the modules on a conductive surface (table with an ESD coating, conductive
ESD foam, ESD bag or container).
Å Do not bring modules near visual display units, monitors or televisions. Keep them at least
10 cm away from the screen.
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Å 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
measuring device. (E.g. by touching an unpainted metal part of the controller casing).
Å Always use an earthed soldering iron if you carry out any soldering work.
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Å Always store modules and components in conductive packaging. (E.g. metallized plastic bags
or metal sleeves) and dispatch them in conductive packaging.
Å If the packaging is not conductive, place the modules in a conductive envelope before pack-
aging. (Use ESD bags, domestic aluminum foil or paper, for example. NEVER use plastic bags
or film).
Å 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.