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Installation, operation and maintenance instructions
High voltage flameproof motors for explosive atmosphere
AMD Rg 355-400-450-500
General information about the installation and safety operation
be sure that no indents, scratches, or deformations
are present and that the surfaces are properly
protected against oxidation. The entire machined
surface shall be covered, before the assembly, with a
slight smearing of silicon grease or special antifriction
grease of the type indicated on the nameplates.
Never use varnishes, adhesives, putting etc.
When the threaded joining components (screws,
bolts, nuts etc.) have to be replaced, make sure that
their material and type were in conformance with the
indication of the nameplates, that the proper elastic
washer are used and that the length of their threaded
shanks were as originally provided to guarantee the
required minimum number of engaged threads.
As a guide for the repair interventions, it is reported a
table with the allowed or not allowed repairs or
modifications of the various motor components.
Sheet No.
3AAM101025 E
Rev. C
Page 8 of 10
Component
Protection
"db"
Frame
no
Endshields
no
Bearing seals
no
Main and auxiliary
terminal boxes
no
Insulators
no
Thread on cables glands
no
Stator core
no (3) no (3)
Stator rewinding
yes
Rotor core
yes
(4)
Rotor cage
yes
(5)
Shaft
yes
(6)
Bearings
no
Lubrication system
yes
Screws
no (7) no (7)
Threaded holes
no
Fans
no
Fan protection enclosures
yes
(9)
Gaskets
no
no = not allowed repair
yes = allowed repair
Any urgent intervention on a component having
repair or modification marked as "operation not
allowed" must be agreed in advance by factory
from where the component comes from and the
intervention must be authorized from that factory.
The electrical machines with the mark "Ex...", after a
repair, must
be always
responsibility of the repairer, with an additional and
inerasable
nameplate
(further
nameplate) indicating:
01.2023
Remarks
"db eb"
no
no
no
(1) Maintain the
original
yes
mechanical
(1)
integrity and IP
protection
no
(2) Maintain the
yes
original IP
(2)
protection
(3) Only minor
repairs allowed
yes
yes
(4) Check for
(4)
overtemperature
(5) Check that the
cage materials
yes
are the same of
(5)
the original
design
(6) With exclusion
yes
for the flame
(6)
seals
no
yes
(7) Strength class
as the original
design
(8) The holes of
the terminal
no(8)
boxes can be
repaired
no
(9) Check the
minimum
yes
clearance
(9)
between static
and rotating parts
Material and
shape exactly as
no
the original
design
provided,
under the
to
the
original
Issued by: MOLM
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