Operation & Maintenance Manual
Alternator Installation and Maintenance
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22637300
Tighten the coupling discs screws to the recommended torque and check that there is lateral
ply on the crankshaft.
Inspection Prior to First Use
Electrical checks
Under no circumstances should an alternator, new or otherwise, be operated if the
isolation is less than 1 megohm for the stator and 100,000 ohms for the other windings.
There are three possible methods for restoring the above minimum values.
a) Dry out the machine for 24 hours in a drying oven at a temperature of approximately 110°C.
b) Blow hot air into the air input, having made sure that the machine is rotating with the exciter
field disconnected.
c) Run in short-circuit mode (disconnect the AVR).
•
Short-circuit the output phases using connections capable of supporting the rated
current (try not to exceed 6 A/mm2).
•
Insert a clamp ammeter to monitor the current passing through the short-circuit
connections.
•
Connect a 48 Volt battery in series with a rheostat of approximately 10 ohms (50
Watts), to the exciter field terminals, respecting the polarity.
•
Connect a 48 Volt battery in series with a rheostat of approximately 10 ohms (50
Watts), to the exciter field terminals, respecting the polarity.
•
Open fully all the alternator orifices.
•
Run the alternator at rated speed. Adjust the exciter field current using the rheostat
to obtain the rated output current in the short-circuit connections.
Note: Prolonged standstill: In order to avoid these problems, we recommend the use of space
heaters, as well as turning over the machine from time to time.
Space heaters are only really effective if they are working continuously while the machine is
stopped.
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