Installation, operation and maintenance instructions
High voltage flameproof motors for explosive atmosphere
AMD Rg 355-400-450-500
General maintenance and revision criteria
Issued by: MOLM
Sheet No.
3AAM101037 E
Rev. B
Page 1 of 2
01.2023
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Maintenance, general
Conscientious and thorough maintenance of a machine
and plant is the best protection against faults and
operational failures. The more critical operational
interruptions are for the process, then the greater should
be the worth of the maintenance investments. As a basic
rule for all maintenance work performed on site, the
applicable safety regulations must be observed, and the
necessary protective measures taken for heavy–current
installations.
It is recommended that a time schedule be set up for
each individual machine and that maintenance cards be
employed. These maintenance cards can be kept in a
card-register or computer files and possibly a copy hung
into plastic envelopes at a vantage point on the machine,
so that the state of maintenance can be checked at any
time.
Maintenance includes daily patrols by the operating
personnel through the whole plant to inspect the
operating conditions and to observe and note down
important operating quantities. During these daily
patrols, special attention is to be paid to possible
deviations from the usual state of operation, especially
with regard to instruments (limit values, lines or marks),
liquid levels, temperatures, vibration and short-circuit
monitoring.
If daily patrols are not feasible due to the location of the
plant (e.g. inaccessible, too remote etc.), the machines
should be fitted with suitable monitoring equipment.
Ideally, the periodic inspections should be carried out
always by the same man. This is the best way to ensure
that deviations from the normal operational behaviour
are noticed.
Any special observations are to be entered in the
logbook. Should a fault condition arise, carefully kept
logbooks help to determine the cause of the fault and
give information to aid remedying and eliminating the
same.
The actual maintenance work, most of which is
performed during planned periods of shutdown, can be
distinguished as follows:
a)
Making-up or replacing consumables
b)
Continuous repetitive inspections and replacing
components subject to wear, and remedying any
fault or defect recognised.
c)
Cleaning
The maintenance schedule of this manual contains
recommendations based on many years of experience.
The time intervals are based on an 16 hours operating
day under normal conditions. The actual circumstances
under which the machines operate are often quite
different so that for each particular case certain time
intervals may need to be adapted to the prevailing site
conditions such as dirt deposits, loading, switching
frequency etc.
The recommended maintenance intervals also assume
fault-free operation. After each serious fault (shutdown)
an extra non-scheduled inspection of the machine or
plant component in question is necessary. The cause of
each shutdown is to be clarified prior to restarting. When
any changes in appearance or operational behaviour are
noticed it must be carefully considered whether and
when intervention is necessary or whether initially a
thorough inspection would be sufficient. Similarly, in the
case of extraordinary operating conditions (short-circuit,
overload etc.) which represent either electrical or
mechanical overloading of the machine, the
maintenance or inspection work is to be immediately
carried out.
Overhaul, general
Overhauls are planned, scheduled inspections of plant
equipment or of the whole plant with the object of
avoiding operational failure due to damage on
components or systems. When carried out at set
intervals such overhauls allow supervision of wear, early
recognition of any sign of damage and timely
replacement of defective parts.
Plant availability is not only determined by operational
failures but more decisively by planned shut-down
periods. The object therefore is to keep scheduled
operational shutdowns to within economically acceptable
limits while simultaneously attaining optimal overhaul
results. This is possible on the following conditions:
-
Carrying out of overhaul at correct time
-
Accurate prediction of work to be performed
-
Short overhaul times by comprehensive planning
and skilful workmanship during the overhaul.
Sometimes it may be practical to deviate somewhat from
the maintenance schedule in order to take advantage of
any occasions arising when, for reasons not necessarily
related to the motors, shutdown is required.
The extent of the overhaul will be largely determined by
the observations made during operation.
All inspection and dismantling/reassembling work
is to be performed by personnel suitably trained
and qualified to operate on machines and
equipments designed and manufactured to be
installed in potentially explosive atmosphere. See
EN 60079-17 (IEC 60079-17) and EN 60079-19 (IEC
60079-19).
Depending on the operating conditions, scheduled over
– hauls every 5 years are recommended. The first over
– haul should be performed after about 3000
5000 starts
or about 20000 hours of operation whichever occurs first.
