Page 18
Foot Deflection
After alignment, check for foot deflection or “soft foot” condition on
each shim location to eliminate distortion of the generator frame. Do
this by loosing one mounting bolt at a time and checking deflection
after tightening. Deflection at the shim location from shims under
compression to a loosened condition must not exceed 0.003 inch.
Doweling
In case the mounting bolts loosen during operation, doweling will
prevent movement of the generator. Dowel as follows:
•
Check the alignment after the generator has been in operation for
at least 48 hours. If alignment is not satisfactory, realign.
•
Drill holes through the footpads and into the base in two
mounting pads opposite each other. Drill the holes slightly
smaller than the dowel pin.
•
Ream the holes to the proper diameter for the pin. Clean out
chips, and install the pins.
Electrical Connections
If the generator was subjected to a rapid change in temperature,
freezing or wet conditions during shipment or storage, measure
the insulation resistance of each winding and dry the generator, if
necessary, as described in the maintenance section.
Make all electrical connections (main load, temperature monitoring
device, space heater, AVR) in accordance with local regulations and
national/international electrical code requirements. Check the electrical
diagrams provided with the generator or manual. The main terminals
need to be properly spaced for the load connections. Refer to Table 6
and Table 7 on pages 44 and 45 for the proper torque values for the
connections.
Grounding points are provided for properly grounding the system to
the generator frame. The grounding wire must be sized to national and
international code requirements.
Space Heaters
To prevent water condensation during long periods of downtime,
connect the space heaters so they start when the generator is turned
off and stop when the generator is switched on. Refer to the electrical
diagrams for the space heater characteristics.
CAUTION:
Space heaters are
designed to energize when the generator
shuts down. They are hot enough to
cause skin burns. The power terminals in
space heaters are active during operation.
Disconnect power from space heaters
before removing generator covers.
NOTE:
The alternator current machines
are designed for continuous operation
with the neutral at or near the ground
potential. Operation with one line at
ground potential should be performed
only during infrequent periods of short
duration, for example, as required for
normal fault clearance.
Summary of Contents for 4P10
Page 8: ...Page 8...