2020.05 / f
11
Electric Power Generation
Installation and maintenance
LSA R/H 49.1
Low Voltage Alternator - 4 pole
4528 en -
4 - SERVICING - MAINTENANCE
4.1 - Safety measures
Servicing or troubleshooting must be
carried out strictly in accordance with
instructions so as to avoid the risk of
accidents and to maintain the machine in
its original state.
All such operations performed on the
alternator should be undertaken by
personnel trained in the commissioning,
servicing and maintenance of electrical
and mechanical components, who must
wear personal protective equipment
appropriate for mechanical and electrical
hazards.
Before any intervention on the machine,
ensure that it cannot be started by a manual
or automatic system and that you have
understood the operating principles of the
system.
Warning : During and after running, the
alternator will reach temperatures hot
enough to cause injury, such as burns.
4.2 - Routine maintenance
• Checks after start-up
After approximately 20 hours of operation,
check that all fixing screws on the machine
are still tight, plus the general state of the
machine and the various electrical
connections in the installation.
4.3 - Air/air heat exchanger
• Primary circuit (hot air)
The air to be cooled flows through the
machine and through the exchanger in a
closed system. The air circulation is
generally ensured by a ventilator locked
onto the machine axle and situated on the
front bearing side. In particular cases
(variable speed ...) the air circulation is
ensured by a motoventilator mounted on
the exchanger casing.
• Secondary circuit (cold air)
Ambiant air is usually used for cooling. The
circulation through tubes is ensured ; either
by a turbine mounted overhanging the back
of the machine on a bearing extension or by
a moto-ventilation mounted on the
exchanger. In order to prevent excessive
overheating caused by the tubes clogging
up, it is adviseable that the stator coil be
monitored with thermal detection probes
(PTC or PT100).
• Performances
We guarantie that the performance of the
exchanger complies with the definitions
agreed upon. (ambiant temperature, power
to be evacuated, environmental conditions,
loss of charge etc.).
• Manufacture of the exchanger
The exchanger casing is made from steel
sheets. The network of tubes is generally
composed of aluminium alloy or steel
tubes. The ends of the tubes are fitted to
steel panels.
• Exchanger maintenance
If the coolant is used in a clean atmosphere
it can run for several years with no
maintenance. If the atmosphere is polluted
(dust, sand, greasy vapours etc.) the tubes
must be cleaned regularly. Clogging of the
tubes becomes noticeable when the thermal
exchange performances are reduced and
the air in the primary circuit overheats
causing the machine to also overheat ;
therefore, machine overheating indicates
that the exchanger is probably dirty.
