Installation And Maintenance Of The Pmg; Table Of Characteristics - Leroy Somer LSA 49.1 4P Manuel D'utilisation Et D'entretien

LEROY-SOMER
4.7 - Installation and maintenance of
the PMG
For the LSA 49.1, the PMG reference is : PMG 3.
4.7.1 - Mechanical characteristics and
adaptation
The components are :
- an adaptation shaft (to fit the rotor on the shaft)
- an M16 tie rod, a cable gland washer and nut for mounting
the rotor on the shaft
- a rotor with 16 magnets
- a frame+wound stator+plastic connection sheath assembly
+plastic ferrules.
- the frame end plate (4 screws CBLXS M5).
- 4 screws HM6 (for fixing the frame to the NDE shield).
If mounting in kit form, follow the following instructions.
1 - Remove the PMG cover [297] and the alternator NDE
shield bearing retainer (71).
2 - Mount the PMG frame assembly [290] on the shield using
the 4 screws HM6.
3 - Put a light coating of anti-vibration adhesive on the tie rod
[295] and screw it fully into the alternator shaft extension
tapped hole.
4 - Mount the magnetised rotor on the adaptation shaft, then
using 2 M10 threaded rods screwed into the rotor slide the
assembly onto the tie rod.
5 - Once in position, remove the 2 M10 rods.
6 - Install the cable gland washer [296].
7 - Tighten the assembly with an M16 nut.
8 - Close the PMG with the cover [297].
9 - Remove the plastic plug on the NDE panel and install the
plastic sheath and its ferrule.
10 - Connect the PMG to the AVR (see section 4.7.2).
4.7.2 - Electrical connection
- Connect the 3 PMG wires (14/15/16), to terminals X1,X2,Z2
on the AVR. Both exciter field wires (5/6) and the voltage
sensing wires (2/3) remain in place.
Electrical characteristics of the PMG 3 :
Stator phase/phase resistance 20°C : 2.1 Ω
No-load A.C. voltage between phases at 1500 rpm : 125 V.
ATTENTION
With the PMG, check that the ST9 jumper has been
disconnected.
4.7.3 - Exploded view of the PMG
291
290
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
SERVICING - MAINTENANCE
297
296
295
294
293
292

4.8 - 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).
4.8.1 - Resistances of main windings at 20°C
(Ω)
Average values for LSA 49.1 - 6-wire version
LSA 49.1 Stator L/N
S2 0.0055
S4 0.0037
M6 0.0029
M7 0.0029
L9 0.0021
Average values for LSA 49.1 - 12-wire version
LSA 49.1 STATOR L/N
S3 0.0051
M5 0.0044
M7 0.036
L9 0.023
4.8.2 - Resistance of AREP auxiliary windings
at 20°C (Ω)
LSA 49.1 Auxil wdg : X1, X2
S2 0.26
S4 0.23
M5 0.29
M6 0.22
M7 0.22
L9 0.17
4.8.3 - Field excitation current i exc (A)
LSA 49.1 No load
S2 0.8
S4 0.85
M6 0.9
M7 0.9
L9 0.9
4.8.4 - Voltage of auxiliary windings at no load
LSA 49.1 X1, X2
50 Hz 90...100 V
60 Hz 108...120 V
For 60 Hz machines, the "i exc" values are approximately 5
to 10% lower.
Ref. 3007 GB - 4.33/a - 10.00
Rotor Field Armature
0.3 12 0.08
0.33 12 0.08
0.38 12 0.08
0.38 12 0.08
0.43 12 0.08
ROTOR Field Armature
0.32 12 0.08
0.36 12 0,08
0.38 12 0.08
0.43 12 0.08
Auxil wdg : Z1, Z2
0.33
0.34
0.34
0.29
0.29
0.29
At rated load
3.7
3.4
3.3
3.5
3.5
Z1, Z2
10 V
12 V
19