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Installation, operation and maintenance instructions
High voltage flameproof motors for explosive atmosphere
AMD Rg 355-400-450-500
Rolling bearings maintenance and checking
Issued by: MOLM
Sheet No.
3AAM101040 E
Rev. B
01.2023
Page 6 of 11
We
res
erv
e
all
r
ig
ht
s
in
th
is
doc
u
ment
and
in
th
e
inf
ormat
io
n
co
nt
ai
n
e
d
th
ere
in.
R
epr
o
duc
tion
,
us
e
of
di
sc
los
ur
e
to
thir
d
pa
rt
ies
w
ithout
ex
pr
es
s
au
th
ority
is
st
ric
tly
f
or
bidd
en.
NU1044 – M1C3
N
NU1044 – M1C3
≥
6
D
6048 – M1C3
NU1048 – M1C3
N
NU1048 – M1C3
(a) : Not standard; (b): not available; (c): with limited life (
40000 H)
Table 4. Standard Bearings for motors with rib cooling circuit, IIB/IIC, cast iron frame AMD vertical assembly.
Size
N° of Poles
D end
N end
355...R..gM(H,S)
2
6316
7213
355...R..gM(H,S)
4 - 6
6322
6316
400...R..gM(H,S)
2
6217
7217
400...R..gM(H,S)
4 - 6
6324
6319
450...R..gM(H,S)
2
6317
7317
450...R..gM(H,S)
4 - 12
6324
7324
500…R..gM (H,S)
4…
6330
7330
Table 5. Standard Bearings for motors with rib cooling circuit
,
IIB/IIC, welded frame AMD
vertical assembly
Size
N° of Poles
D end
N end
450...R…M
2
NU 215
6317
450...R…M
4 - 12
6324
7321
500...R…M
4 - 12
6326
7321
Table 6. Standard Bearings for AMD motors with tube cooling circuit and vertical assembly.
Size
N° of Poles
Side
Frequency
50 Hz
60 Hz
500…T
≥
4
D
6024 - C3
6024 - C3
500…T
≥
4
N
7319
7319
560…T
≥
4
D
6026 - C3
6026 - C3
560…T
≥
4
N
7322
7322
630…T
≥
4
D
6030 - C3
6030 - C3
630…T
≥
4
N
7324
7324
710…T
4
D
(a)
(b)
710…T
4
N
(a)
(b)
710…T
≥
6
D
6034 - C3
6034 - C3
710…T
≥
6
N
7330
7330
900…T
≥
6
D
6044 – C3
6044 – C3
900…T
≥
6
N
2x 7334
2x 7334
(a) : Not standard; (b): not available; (c): with limited life (<40000 H)