Accurex XRUBS-160 Посібник з монтажу, експлуатації та технічного обслуговування - Сторінка 6
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Друкувати сторінкуPre-Starting Checks
1. Check all fasteners and setscrews for tightness.
The wheel should rotate freely and be aligned as
shown in Figure 8.
Overlap
Figure 8
2. Wheel position is preset and the unit is test run at
the factory. Movement may occur during shipment
and realignment may be necessary.
3. Centering can be accomplished by loosening
the bolts holding the drive frame to the vibration
isolators and repositioning the drive frame.
4. Wheel and inlet cone overlap can be adjusted
by loosening the setscrews in the wheel hub and
moving the wheel to the desired position.
5. Check wheel rotation (viewing from the shaft side)
by momentarily energizing the unit. Rotation should
be clockwise as shown in
Figure 9 and correspond to the
rotation decal on the unit.
6. If wheel rotation is incorrect,
reverse two of the wiring leads
or check motor wiring for single
phase. Fan RPM should be
checked and verified with a
tachometer.
WARNING
Correct direction of wheel rotation is critical. Reversed
rotation will result in poor air performance, motor
overloading and possible motor burnout.
AVERTISSEMENT
La turbine doit impérativement tourner dans le bon
sens. Une rotation en sens inverse entraînerait de
mauvaises performances de soufflage, une surcharge
du moteur voire un grillage du moteur.
7. Always loosen tension enough to install belts
without stretching. Do not force belt(s). Forcing the
belts will break the cords and cause belt failure.
See Figure 10.
Figure 10
8. For units with two groove pulleys, adjust so the
tension is equal in both belts.
6
Steel Grease Fan
Overlap
Fan Size
in. (mm)
140-160
1/4 (6)
180-200
1/2 (13)
Clockwise Rotation
Figure 9
9. If adjustments are made, it is very important to
check the pulleys for proper alignment. Misaligned
pulleys lead to excessive belt wear, vibration, noise
and power loss. See Figure 11.
CORRECT
WRONG
Figure 11
10. Belt tension can be adjusted by loosening four
fasteners on the drive frame. See Figure 12. The
motor plate slides on the slotted adjusting arms
and drive frame angles in the same manner.
Four (4) fasteners in total.
Identical fasteners
on opposing
side must also be
loosened.
11. Belt tension should be adjusted to allow 1/64 inch
(0.397 mm) of deflection per inch of belt span. For
example, a 15 inch (381 mm) belt span should have
15/64 inch (5.95 mm)
(or about 1/4 inch
(6 mm)) of deflection
with moderate
thumb pressure at
mid-point between
pulleys. See
Figure 13.
12. The adjustable motor pulley is factory set for the
RPM specified. Speed can be increased by closing
or decreased by opening the adjustable motor
sheave. Two groove variable pitch pulleys must be
adjusted an equal number of turns open or closed.
13. Any increase in speed represents a substantial
increase in the horsepower required by the unit.
14. Motor amperage should always be checked to
avoid serious damage to the motor when speed is
varied.
IMPORTANT
The fan has been checked for mechanical noises at
the factory prior to shipment. If mechanical noise
should develop, suggested corrective actions are
offered in the Troubleshooting section.
IMPORTANT
Over tightening will cause excessive bearing wear and
noise. Too little tension will cause slippage at startup
and uneven wear.
WRONG
WRONG
Figure 12
Belt Span
Deflection =
64
Figure 13
Belt
Span