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
Issued by: MOLM
Sheet No.
3AAM101025 E
Rev. C
01.2023
Page 8 of 10
We
res
erv
e
a
ll
ri
g
ht
s
in
this
d
oc
um
ent
an
d
in
th
e
infor
mati
o
n
con
tain
e
d
th
er
e
in
.
R
ep
rod
uct
ion
,
use
o
f
disc
losure
t
o
th
ir
d
pa
rt
ies
w
itho
ut
expr
ess
au
th
ori
ty
is
s
tr
ic
tly
f
orbi
dd
en
.
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.
Component
Protection
Remarks
"db"
"db eb"
Frame
no
no
Endshields
no
no
Bearing seals
no
no
Main and auxiliary
terminal boxes
no
yes
(1)
(1) Maintain the
original
mechanical
integrity and IP
protection
Insulators
no
no
Thread on cables glands
no
yes
(2)
(2) Maintain the
original IP
protection
Stator core
no (3) no (3)
(3) Only minor
repairs allowed
Stator rewinding
yes
yes
Rotor core
yes
(4)
yes
(4)
(4) Check for
overtemperature
Rotor cage
yes
(5)
yes
(5)
(5) Check that the
cage materials
are the same of
the original
design
Shaft
yes
(6)
yes
(6)
(6) With exclusion
for the flame
seals
Bearings
no
no
Lubrication system
yes
yes
Screws
no (7) no (7)
(7) Strength class
as the original
design
Threaded holes
no
no(8)
(8) The holes of
the terminal
boxes can be
repaired
Fans
no
no
Fan protection enclosures
yes
(9)
yes
(9)
(9) Check the
minimum
clearance
between static
and rotating parts
Gaskets
no
no
Material and
shape exactly as
the original
design
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 provided, under the
responsibility of the repairer, with an additional and
inerasable nameplate (further to the original
nameplate) indicating:
