Nanni QLS 65T, User Manual

Page: 71 / 80

71
CONNECTIONS TO TERMINAL POSTS
ROUTINE MAINTENANCE
Checks after start-up
After approximately 20 hours of operation, check that
all fixing bolts on the machine are still tight, plus the
general state of the machine and the various electrical
connections in the installation.
Electrical service
WARNING !
Commercially-available volatile degreasing agents
can be used, but do not use harsh solvants such as :
trichlorethylene, perchlorethylene, trichloroethane or
any alkaline type of products.
These operations must be performed in a cleaning
station, using a vacuum system collecting and flushing
out the products used with waste disposal recycling.
Although the insulating components and the
impregnation system are not at risk of damage from
solvents, avoid letting the cleaning product to run into
the slots.
Apply the product with a brush, sponging frequently to
avoid accumulation in the housing. Dry the windings
with a dry cloth. Let any traces evaporate before
reassembling the machine.
Mechanical service
WARNING !
Cleaning the alternator with water or a high pressure
washer is strictly prohibited. Any problems arising
from such treatment are not covered by warranty. For
degreasing: use a brush and detergent (suitable for
paintwork). For dusting: use an air gun.
Bearings
Bearings are permanently greased. Average greasing is
depending of use = 20 000 hours of run or 3 years.
Mechanical defects
FAULT ACTION
Bearing
Excessive overhea-
ting of one or both
bearings (bearing
temperature 80°C
above the ambient
temperature)
-If the bearing has turned blue
or if the grease has turned
black, change the bearing.
- Bearing not fully locked
(abnormal play in the bearing
cage)
- End shields incorrectly
aligned
Abnormal
temperature
Excessive overhea-
ting of alternator
frame (more than
40° C above the
ambient tempera-
ture)
Air flow (inlet-outlet) partially
clogged or hot air is being
recycled from the alternator
or engine
-Alternator operating at too
high a voltage (>105% of Un
on load)
-Alternator overloaded
Vibrations Too much vibration
-Misalignment (coupling)
-Defective mounting or play
in coupling
-Rotor balancing fault (En-
gine - Alternator)
Abnormal
noise
Alternator
damaged by a
significant impact,
followed by hum-
ming and vibration
-System short-circuit
-Misparalleling
Possible consequences
-Broken or damaged coupling
-Broken or bent shaft end
-Shifting and short-circuit of
main field
-Fan fractured or coming
loose on shaft
-irreparable damage to
rotating diodes/AVR, surge
suppressor
S09 ALTERNATOR