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2021.04 / l
Electric Power Generation
20
Installation and maintenance
TAL 047
Low Voltage Alternator - 4 pole
5378 en -
- Screw a threaded rod into the thrust
bearing.
- Refit the shield (30) on the machine.
- Slide the threaded rod into the shield hole
to make it easier to assemble (see basic
diagram).
- Fit the thrust bearing screws, remove the
threaded rod, fit the other screw and tighten
up the assembly.
- Tighten the shield (30) screws.
- Refit the air outlet grille (33).
- Check that the machine assembly is
correctly mounted and that all screws are
tightened.
4.7 - Installation and maintenance of
the PMG
The PMG reference is PMG 2.
See the PMG manual ref : 4211.
4.8 - Table of characteristics
Table of average values:
Alternator - 4 poles - 50 Hz - Standard
winding No.
6S (6-wire) (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).
• Three-phase: 4-pole
SHUNT/AREP excitation
Resistances at 20 °C (Ω)
Type
Stator L/N
Rotor Exciter
field
Exciter
armature
A
0.0080 0.455
10.64
0.071
B-C
0.0062 0.521
10.64
0.071
D
0.0044 0.579
10.64
0.071
E
0.0046 0.604
10.64
0.071
F*
0.0035 0.645
10.64
0.071
Resistances of auxiliary windings
AREP at 20 °C (Ω)
Type
X1, X2
Z1, Z2
A
0.344
0.462
B-C
0.317
0.505
D
0.309
0.450
E
0.294
0.411
F*
0.265
0.377
Field excitation current i exc (A)
SHUNT/AREP - 400V - 50 Hz
“i exc”: excitation current of the exciter field
Type
No load
At rated load
A
0.97
4.24
B
0.87
3.72
C
0.87
4.06
D
0.97
3.79
E
0.85
3.89
F*
0.93
3.87
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)
A
976
375
B-C
1113
427
D
1240
477
E
1289
494
F*
1372
525
* Only available for 6-wire
After operational testing, it is essential to
replace all access panels or covers.