5.8.3 Electrical contact
If no torque value is specified into the concerned chapter
the following values can be used for brass (or copper alloy)
clean and dry threads.
CAUTION :
THE USE OF ANY COMPOUND ONTO ELECTRICAL
CONTACT THREAD IS FORBIDDEN
Thread
M5
M6
M8 M10 M12 M14 M16
Torque
[N.m]
2.5
4
8
20
35
57
87
5.8.4 Rotating diodes
CAUTION :
THE ROTATING DIODE FASTENING SCREWS MUST
BE TIGHTENED USING A TORQUE WRENCH
CALIBRATED TO THE RECOMMENDED
TORQUE.WITHOUT USING ANY THREAD COMPOUND
Diode
Tightening torque
SKx 100/..xx
10 N.m
SKx 130/..xx
10 N.m
SKx 240/..xx
30 N.m
5.8.5 Synthetic parts
This applies to parts made of light synthetic raw material
(plastic covers; fiber glass covers; fiber glass fan air shroud
…)
CAUTION :
THE USE OF A THREAD LOCK COMPOUND IS
IMPERATIVE
Thread
M8 M10 M12 M14 M16
Torque
[N.m]
15
15
15
15
15
5.9 ELECTRICAL MEASURING
INSTRUMENTS
5.9.1 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.
5.10 WINDINGS INSULATION CHECK
5.10.0 General
The insulation resistance enables the status of the machine
insulating to be verified.
The following measurements can be taken at any time
without any damage to machine insulating material.
The insulation check must be done :
- Before the start up
- After a long standstill
- As soon as an abnormal operation occurs.
- At maintenance intervals (refer to chapter 5.1)
If the measurement indicates a poor result we advise
contacting our Service department.
To perform the measurement the generator must be
stopped.
If the insulation resistance is less than that required, it is
necessary, to clean and to dry the machine (refer to
chapter 5.13).
DANGER :
BEFORE ANY WORK THE RULES CONCERNING THE
SAFETY OF MATERIALS AND PERSONS MUST BE
APPLIED (TOTAL LOCKING OF THE GENERATOR
FUNCTIONS, GROUNDING OF THE PHASES …)
5.10.1 Insulation measure
Disconnect the three phases at the generator terminals.
CAUTION
ALL ACCESSORIES MUST BE DISCONNECTED (AVR ,
EMC FILTER ;;;)
REFER TO THE ELECTRICAL SCHEMATICS TO
IDENTIFY THE ACCESSORIES TO DISCONNECT
The measurement has to be taken between one phase and
the earth. Reading is done after 1 minute of test
Electric Power Generation
Installation and maintenance
5654
en - 2017.
10
/
a
LSA 5
2
.2
MHV
Industrial Range Alternators
- 4 pole
29
