Examens Corrigés Électromécanique des Systèmes Automatisées-ESA-OFPPT-PDF

Examens Corrigés ESA-OFPPT-PDF
Data
These two
spells of upkeep remedial are based on 2 ideas:
Indicative
• Functional
diagrams, cause tree: this approach makes it possible to find the origin of the
failure by following a tree structure
• Tables of
cause, effect, remedy type (AMDEC scene: Analyze Failure Mode of their Effect
and Criticality).
• Tests: to
ensure that the machine operates normally.
2-Repair
This is the
internship that follows the indicative and allows the system to return to proper
operation.
In this
internship you must determine:
• The
various repair work placements.
• The time
required for repair.
• The means
of execution during the repair.
Preventive
support
Preventive
support consists of working on equipment before it fails.
It aims to:
• Reduce
emergency intercessions.
• Avoid
periods of malfunction before failure.
• Make
repair conceivable.
• Increase
the level of security.
Two types of
preventive support systems:
1-Systematic
preventive maintenance (periodic):
It includes
periodic investigations and mediations planned according to a schedule to
ensure the continuous operation of the equipment.
Its
objective is:
• Determine
the plausible cost of upkeep.
• To choose
the frequencies of intervention on a system.
• Plan tasks
and reinforce security measures.
2-Conditional
preventive maintenance:
Carried out
following readings, measurements, checks revealing the state of degradation of
the equipment.
It sever in
addition to effective detection of faults, improves availability by scheduling
operations.
Its
objective is:
• Avoid
unnecessary disassembly linked to systematic support, which can cause failures
• Increase
the security of people.
• Avoid
emergency intercessions following the evolution of the beginning of anomalies.
The
evaluation of the naughty
The choice
of support policy depends on several criteria:
Certain
machine failures can cause very significant consequences on the profitability
of the company, they can cause:
• Poor
quality products, defective in particular because of stops and restarts.
• Work
stoppages causing delivery impedes, which can lead to the payment of penalties.
• Discharges
which pollute the environment and threaten the life of people.
Depending on
the influence of breakdowns, the risks can be classified as follows:
•
Unacceptable risk: we must remove the causes of failure and remove the effects
of residual failures, we base ourselves on the idea of conditional preventive
upkeep.
• Risk
worthy if limited: a choice must be made between systematic preventive support and
conditional upkeep.
• Risk
worthy: in this case you can choose the restorative support.
Load the
machine
According to
this criterion, it is the load and the capacity of the machine that count. The
influence of a machine failure varies depending on the machine load:
• If the
machine is fully charged then it is preferable to avoid failures, here we use
the preventive upkeep.
• If the
machine has a low load, we use a restorative upkeep policy.
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