Nidec 22765-01, Руководство пользователя

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Page 20
• With the three-frame units that have an aluminum fan, loosen
the fan hub bolts to move the fan. After installing the drive
disc-to-flywheel bolts, move the fan back so the rotor-side edge
is flush with the air opening and the minimum distance between
the windings and the fan is 3/8" (9.525 mm). Torque the fan hub
bolts to 75 ft-lbs (101.69 Nm).
• With sheet metal fans with cast hubs that are in turn mounted on
the drive hub, mark the drive hub as closes as possible to the fan
hub. Loosen the two set screws, the fan clamping bolt, and the
fan bolts. Wedge the fan open, and move it out of the way (See
Figure 15). After attaching the drive discs-to-flywheel bolts,
align the fan hub to the mark to move the fan back to its original
position. Ensure the key is fully in place under the fan hub and
positioned so the set screw will press on the key. Tighten the fan
hub clamping bolt and the set screws. Install the fan bolts and
torque them according to Table 5 and Table 6.
Set screw
Key
Bolt holes
Alignment mark on
drive hub
Fan hub bolt
Fan hub
Keyway
Drive discs
Fan
Fan bolts
Figure 15 Moving Sheet Metal Fans
CAUTION: The generator with
sheet metal fans and cast fan hubs is
shipped from the factory with the fan 1/2
to 3/4" (12.7 to 19.05 mm) from the fan
baffle and clear of the inside adaptor for
optimum air flow through the exhaust
screen.