SDMO R44C3 - Page 184

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2010.10 / i
LeRoY-SoMeR
4.4.6.7 - Accessing the main eld and stator
4.6.7.1 - Dismantling
Follow the procedure for dismantling the bearings (see
sections 4.6.5.1 and 4.6.6.1)
- Remove the coupling disc (single-bearing alternator) or the
DE shield (two-bearing alternator) and insert a tube of the
corresponding diameter on the shaft end.
- Rest the rotor on one of its poles, then slide it out. Use the tube
as a lever arm to assist dismantling.
- After extraction of the rotor, be careful not to damage the fan.
If the fan is dismantled, it is essential that it is replaced for the
43.2.
NOTE: If intervention is required on the main eld
(rewinding, replacement of components), the rotor
assembly must be rebalanced.
4.6.7.2 - Reassembling the main eld
- Follow the dismantling procedure in reverse order.
Take care not to knock the windings when retting the rotor in
the stator.
- If the fan is being replaced on the 43.2, assemble the parts as
shown in the following diagram. Fit a tube and a threaded
screw. On the 44.2 the fan is xed by screws on the hub.
Follow the procedure for reassembling the bearings (see
sections 4.6.5.2 and 4.6.6.2).
After operational testing, replace all access panels or
covers.
4.7 - Installation and maintenance
of the PMG
For the LSA 43.2 and LSA 44.2, the PMG reference is PMG 1.
See the PMG maintenance manual, ref: 4211.
CAUTION
Mounting is impossible with the «regreasable bearings»
option with the LSA 44.2.
4.8 - Electrical characteristics
Table of average values:
Alternator - 2 and 4 poles - 50 Hz/60 Hz - Winding n° 6 and M
or M1 connected in dedicated single-phase. (400 V for the
excitation values).
The voltage and current values are given for no-load operation
and operation at rated load with separate eld excitation. All
values are given at ± 10% (for exact values, consult the test
report) and are subject to change without prior warning. For 60
Hz machines, the resistance values are the same and the
excitation current «i exc» is approximately 5 to 10% weaker.
4.8.1 - 3-phase LSA 43.2 4 P, SHUNT excitation
Resistances at 20 °C (Ω)
LSA 43.2 Stator L/N Rotor Field Armature
S1 0.155 1.35 18.4 0.23
S15 0.155 1.35 18.4 0.23
S25 0.155 1.35 18.4 0.23
S35 0.128 1.41 18.4 0.23
M45 0.105 1.57 18.4 0.23
L65 0.083 1.76 18.4 0.23
L8 0.063 1.96 18.4 0.23
Field excitation current i exc (A) - 400 V - 50 Hz
«i exc»: excitation current of the exciter eld
LSA 43.2 no load on load
S1 0.5 1.3
S15 0.5 1.5
S25 0.5 1.6
S35 0.5 1.8
M45 0.4 1.6
L65 0.4 1.6
L8 0.4 1.6
4.8.2 - 3-phase LSA 43.2 4 P, AREP excitation
Resistances at 20 °C (Ω)
LSA 43.2
Stator
L/N
Rotor
Wind.
X1,X2
Widing.
Z1,Z2
Field Armat.
S1 0.155 1.35 0.32 0.52 4.6 0.23
S15 0.155 1.35 0.32 0.52 4.6 0.23
S25 0.155 1.35 0.32 0.52 4.6 0.23
S35 0.128 1.41 0.29 0.5 4.6 0.23
M45 0.105 1.57 0.26 0.51 4.6 0.23
L65 0.083 1.76 0.26 0.44 4.6 0.23
L8 0.063 1.96 0.21 0.4 4.6 0.23
Field excitation current i exc (A) -400 V -50 Hz
«i exc»: excitation current of the exciter eld
LSA 43.2 no load on load
S1 1 2.6
S15 1 3
S25 1 3.2
S35 1 3.6
M45 0.8 3.2
L65 0.8 3.2
L8 0.8 3.2
INSTALLATION AND MAINTENANCE
LSA 43.2 / 44.2 - 4-poLe
ALTeRNAToRS
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