Accurex XRUBS-160 Kurulum, Kullanım ve Bakım Kılavuzu - Sayfa 6

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Pre-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.

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

Figure 12

Belt Span

Deﬂection =

Figure 13

Belt

Span