2.5 ANTI FRICTION BEARING
2.5.0 Description of antifriction bearings
The bearings ensure the rotor rotation guiding and axial
location
The bearings are protected from ambiant dust by labyrinth
seals and are of replaceable type.
The bearings must be lubricated regularly. The old grease
is forced out at the lower part of the bearings by the force
of the new grease being injected.
2.5.1 Antifriction bearing protection devices
As an option, the bearing may be equipped with RTD or
PTC sensors to detect eventual overheating
For special use in warm surroundings where the
temperature of the bearings exceeds the authorised limit
(for a bearing known to be in good condition), contact us.
Bearing; Alarm points and shutdown:
• alarm
90°C (194°F)
• shutdown
95°C (203°F)
To improve the machine protection we recommend to set
the alarm point following effective site conditions:
Alarm temperature (*) = Highest recorded temp + 15°K
(*) do not pass over the values of the previous chart.
E.g. : At site the common bearing temperature is 60°C. Set
the alarm temperature to 75°C instead of 90°C as indicated
in the previous chart
NOTE:
Specific dedicated devices based on the analysis of the
vibration signal are able to monitor bearings behavior
2.6 Not applicable
2.7 Not applicable
2.8 Not applicable
2.9 Not applicable
2.10 Not applicable
2.11 Not applicable
2.12 TRANSPORT LOCKING SYSTEM
Certain type of Machines may have their rotor locked
during transport.
The locking systems are red painted
The locking systems must be removed just before the
alternator final installation and re install if the alternator is
later re transported.
CAUTION:
THE ROTOR LOCKING SYTEM MUST REMAIN IN
PLACE IF THE ALTERNATOR IS SUBJECT TO BE
TRANSPORTED.
In case the locking system has to be reused; the system
must be relocated taking care not to touch other part than
the shaft. If necessary turn the shaft to avoid contact of the
locking system with the rotor cables
CAUTION:
THE ROTOR LOCKING FIXING SCREW MUST BE
TIGHTENED TO THE NOMINAL RECOMMENDED
TORQUE.
The Locking system fixing screws must be correctly
tightened (torque noticed onto plate item "2"). A too low
torque can conduce to an insufficient locking effect
Non Drive End bearing; Locking system examples:
1
2
3
3
1
2
3
3
1 - Cable
2 – Red label out of the alternator indicating a Locking
system
3 – Rotor locking system
Electric Power Generation
Installation and maintenance
5654
en - 2017.
10
/
a
LSA 5
2
.2
MHV
Industrial Range Alternators
- 4 pole
9
