Nidec LSA 52.3 - Steel Screws in Steel Tapping; Plugs; Electrical Contact; Rotating Diodes

Electric Power Generation
Installation and maintenance
5382 en - 2022.11 / h
LSA 52.3 / LSA 53.2 / LSA 54.2
Industrial Range Alternators
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25
A medium strength thread locking compound such as or
similar to "Loctite 242"; or "Omnifit 100M" (from Henkel).
5.6.1 Steel screws in steel tapping
If no torque value is specified in the relevant chapter, apply
the following values to secure the metal parts together.
Fasteners: Steel / Steel
(with medium strength thread locking compound)
Ø nominal
(mm)
Torque
(N.m)
Ø nominal
(mm)
Torque
(N.m)
3
1.0
18
222
4
2.3
20
313
5
4.6
22
430
6
7.9
24
540
8
19.2
27
798
10
37.7
30
1083
12
64.9
33
1467
14
103
36
1890
16
160
5.6.2 Plugs
If no torque value is specified in the relevant chapter, apply
the following values to tighten the plugs.
Steel and copper alloy Plugs
(with medium strength thread locking compound)
Ø nominal
(inches)
Torque
(N.m)
Ø nominal
(inches)
Torque
(N.m)
G3/8
30
G1 ¼
160
G1/2
40
G1 ½
230
G3/4
60
G2
320
G1
110
G2 ½
500
5.6.3 Electrical contact
If no torque value is specified in the relevant chapter, apply
the following values for clean and dry brass (or copper
alloy) threads.
CAUTION:
THE USE OF THREAD LOCKING COMPOUND ON
ELECTRICAL FASTENERS IS PROHIBITED.
Thread M5 M6 M8 M10 M12 M14 M16
Torque
[N.m]
3.3 5.7 14 28 48 76 118
5.6.4 Rotating diodes
CAUTION:
THE ROTATING DIODE FASTENING SCREWS MUST
BE TIGHTENED USING A TORQUE WRENCH
CALIBRATED TO THE RECOMMENDED TORQUE.
Diode Tightening torque
SKR 100/.. 10 N.m
SKR 130/.. 10 N.m
SKN 240/.. 30 N.m
5.6.5 Synthetic parts
This applies to lightweight parts made of synthetic
materials (plastic covers, fiberglass covers; fiberglass fan
air deflector, etc.).
CAUTION:
THE USE OF A THREAD LOCKING COMPOUND IS
IMPERATIVE.
Thread M8 M10 M12 M14 M16
Torque
[N.m]
15 15 15 15 15
5.7 ELECTRICAL MEASURING
INSTRUMENTS
5.7.1 Instruments used
- AC voltmeter 0-600 Volts
- DC voltmeter 0-150 Volts
- Ohmmeter 10E-3 to 10 ohms
- Megohmmeter 1 to 100 MOhms / 500 Volts
- AC Ammeter 0- 4500 A
- DC Ammeter 0-150 A
- Frequency meter 0-80 Hz
Low resistance can be measured by means of an
appropriate ohmmeter or by using a Kelvin or Wheatstone
bridge.
NOTE:
The identification of the equipment polarity may differ from
one ammeter to another.
5.8 INSULATION CHECK OF WINDINGS
5.8.0 General information
The insulation resistance is used to check the insulation
status of the machine.
The following measurements can be taken at any time
without any damage to the machine insulating material.
The insulation check must be done:
- Before the start up
- After a long shut-down