2021.06 / o
18
Electric Power Generation
Installation and maintenance
LSA 42.3
Low Voltage Alternator - 4 pole
4803 en -
Follow the procedure for reassembling the
bearings.
4.7 - Installation and maintenance of
the PMG
The PMG reference is PMG 0.
See the PMG manual ref : 4211.
4.8 - Table of characteristics
Table of average values:
Alternator - 4 pole - 50 Hz - Standard winding
No. 6 (12-wire) and M or M1 (4-wire)
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 field excitation.
All values are given to within ± 10% and may
be changed without prior notification (for
exact values, consult the test report).
For 60 Hz machines, the “i exc” values are
approximately 5 to 10 % lower.
• Three-phase: 4-pole, SHUNT excitation
Resistances at 20 °C (Ω)
Type
Stator
L/N
Rotor Exciter
field
Exciter
armature
VS1
0.277
0.60
17.6
0.19
VS2
0.261
0.62
17.6
0.19
VS3
0.213
0.67
17.6
0.19
S4/S5
0.151
0.78
17.6
0.19
M7
0.135
0.84
17.6
0.19
M8
0.114
0.87
17.6
0.19
L9
0.091
0.95
17.6
0.19
Field excitation current i exc (A)
400V - 50 Hz
“i exc”: excitation current of the exciter field
Type
No load
At rated load
VS1
0.55
1.77
VS2
0.52
1.75
VS3
0.51
1.8
S4
0.49
1.55
S5
0.49
1.76
M7
0.46
1.77
M8
0.5
1.9
L9
0.5
2.07
• Three-phase: 4-pole, AREP excitation
Resistances at 20 °C (Ω)
Type
Stator
L/N
Rotor Exciter
field
Exciter
armature
VS1
0.277
0.60
7.36
0.19
VS2
0.261
0.62
7.36
0.19
VS3
0.213
0.67
7.36
0.19
S4/S5
0.151
0.78
7.36
0.19
M7
0.135
0.84
7.36
0.19
M8
0.114
0.87
7.36
0.19
L9
0.091
0.95
7.36
0.19
Resistance of auxiliary windings at
20 °C (Ω)
Type
X1, X2
Z1, Z2
VS1
0.402
0.454
VS2
0.398
0.475
VS3
0.402
0.517
S4/S5
0.334
0.458
M7
0.307
0.426
M8
0.319
0.447
L9
0.313
0.433
