Table of Contents
Advertisement
Belt profile
B
New belts have to be re-tensioned after 24 hours operation.
If belt tensioning is required, please proceed as follows:
1. Loosen the lock nuts on the motor base adjusting screws.
2. Turn the motor base adjusting screws clockwise to tension the belt, or counter-clockwise to relieve belt
tension. During adjustment of belt tension the drives should be rotated several times by hand to evenly
distribute the tension throughout the belt.
3. When the belt is properly tensioned, re-tighten the locking nuts on the motor base adjusting screws.
There should be no "chirp" or "squeal" when the fan motor is started.
Drive Alignment
Proper drive alignment ensures maximum belt life. Alignment is checked for standard drives after correct belt
tensioning by placing a straight-edge across both sheaves as shown in the figure below.
Sheave alignment standard drives
1. Motor sheave
2. Fan sheave
3. Points of contact
When the drives are properly aligned the straight edge will contact all four points as indicated. There should be no
more than 1,5 mm deviation from four point contact. If realignment is necessary, loosen the motor sheave and
align it with the fan sheave. Allow approximately 6 mm for draw-up as the bushing screw is re-tightened.
Locking Collar
The excentric locking collar of the bearing at the drive end ensures that the inner bearing race is secured to the fan
shaft. Locking collars can be set using the following procedure. (See figure below)
24
W W W . B A L T I M O R E A I R C O I L . E U
CAUTION
Over-tensioning of belts can lead to component damage.
Diameter (mm)
motor sheave
100 through 118
125 through 140
150 through 170
>180
Belt tension forces
Deflection force (kg)
Min.
Max.
1.5
2.0
1.5
2.5
2.0
2.5
2.5
3.0
Advertisement
Table of Contents
