18
2022.11 / l
Electric Power Generation
Installation and maintenance
LSA 49.3
Low Voltage Alternator - 4 pole
5280 en -
• Three-phase: 4-pole AREP excitation
Resistances at 20 °C (Ω)
Type
Stator
L/N
Rotor Exciter
field
Exciter
armature
S4 (6-wire) 0.0037
0.333 11.55
0.069
S4 (12-wire) 0.0040
0.381 11.55
0.069
M6
0.0031
0.369
11.55
0.069
M8
0.0029 0.436
11.55
0.069
L9
0.0020
0.472
11.55
0.069
L10
0.0020
0.485
11.55
0.069
Resistances of auxiliary windings
AREP at 20 °C (Ω)
Type
X1, X2
Z1, Z2
S4 (6-wire)
0.249
0.297
S4 (12-wire)
0.257
0.312
M6
0.201
0.260
M8
0.205
0.268
L9
0.204
0.262
L10
0.208
0.269
Field excitation current i exc (A)
AREP - 400V - 50 Hz
“i exc”: excitation current of the exciter field
Type
No load
At rated load
S4 (6-wire)
0.99
4.04
S4 (12-wire)
1.12
3.77
M6
1.11
3.8
M8
0.87
3.52
L9
0.99
3.46
L10
0.9
3.62
For 60 Hz machines, the “i exc” values are
approximately 5 to 10 % lower.
• Table of weights
(values given for information only)
Type
Total weight (kg)
Rotor (kg)
S4
1480
541
M6
1622
604
M8
1683
630
L9
1835
686
L10
1884
703
After operational testing, it is essential to
replace all access panels or covers.
