2020.05 / f
18
Electric Power Generation
Installation and maintenance
LSA R/H 49.1
Low Voltage Alternator - 4 pole
4528 en -
- Fit the new bearing, after heating it by
induction at approximately 80°C.
WARNING
Replace the dismantled bearing with a
new one.
• Complete dismantling
- Take out the NDE bearing following the
instructions in section above.
- Take out the DE bearing following the
instructions in section above.
- Remove the access plates (140).
- Remove the lubricating tubes (77).
- Dismantle the mill tube case (116) on LSA
R or exchanger (11h + 11s LSA H).
- Dismantle the front bush (30).
- Support the rotor (4) on the interconnection
side using a belt or a bracket.
- Using a mallet gently hit the end of the shaft
on the opposite side of the interconnection.
- As the rotor moves adjust the belt to
compensate for shift in weight.
• Complete reassembly
- Place the «O» ring seal (349) and the
preloading wavy washer
(79) in the bearing seat (36).
- Mount and fix the rear flange (82) on the
rear base (36).
- Mount the rotor (4) in the stator (1).
- Mount and fix the front bush (30).
- Remount the tube casings (116).
- Remount the front and rear tubes (77) in
the inner bearing caps.
- Remount the access plates (140).
- Remount and fix the the front flange (410).
- Fix the inner cap (68).
- Remount the V-Ring gasket (247).
- Remount the V-Ring gasket (249).
- Remount the turbine cover (117).
- Remount the turbine (118).
- Remount the air intake grid (51).
- Reconnect the field system and close the
terminal box.
4.10 - Table of characteristics
Table of average values.
Alternator - 4 poles - 50 Hz - Standard
winding No. 6 (400V for the excitation
values).
The voltage and current values are given for
no-load operation and operation at rated
load with separate field excitation. All values
are given at ± 10% and may be changed
without prior notification (for exact values,
consult the test report).
• Resistances of main windings at
20°C (Ω)
Average values for 6S winding (6 wires)
Type
Stator L/N Rotor Field Armature
L6
0.0029
0.38
12
0.08
L9
0.0021
0.43
12
0.08
• Field excitation current i exc (A)
Type
No load
At rated load
L6
0.5
2.2
L9
0.9
2.2
For 60 Hz machines, the «i exc» values are
approximately 5 to 10% lower.
