106
G20, 30, 40 SIIIA Operation & Maintenance Manual
CHECKS PRIOR TO FIRST USE
Electrical checks
WARNING
Under no circumstances should an alternator, new or
otherwise, be operated if the insulation is less than 1
meg ohm for the stator and 100,000 ohms for the
other windings.
There are 2 possible methods for restoring the above
minimum values.
a) Dry out the machine for 24 hours in a drying oven at a
temperature of 110 °C (without the regulator).
b) Blow hot air into the air intake, having made sure that
the machine is rotating with the exciter field
disconnected.
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.
WARNING
Ensure that the alternator has the degree of
protection matching the defined environmental
conditions.
When the alternator’s power output is ensured
directly through cables, these must be connected
before start-up.
Mechanical checks
Before starting the machine for the first time, check that:
•
all fixing bolts and screws are tight.
•
the cooling air is drawn in freely.
•
the protective grilles and housing are correctly in
place.
•
the standard direction of rotation is clockwise as seen
from the shaft end (phase rotation in order 1 - 2 - 3).
For anti-clockwise rotation, swap 2 and 3.
•
the winding connection corresponds to the site
operating
voltage
(See
the
TERMINAL
CONNECTION DIAGRAMS, which appear on the
following pages).
Summary of Contents for G20 SIIIA
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