Belt profile
Diameter (mm)
motor sheave
Deflection force (kg)
Min.
Max.
XPA
80 through 125
135 through 200
>200
1.5
2.0
2.5
2.5
3.0
3.5
SPA
100 through 125
132 through 212
>212
1.5
2.0
2.0
2.0
2.5
3.0
Belt tension forces
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.
When the drives are properly aligned the gap measured between straight-edge and sheave does not exceed 0,5
mm per 100 mm of fan sheave diameter.
Checking sheave alignment
1.
Motor sheave
2.
Fan sheave
3.
Points of contact
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)
1. Stop fan(s) and remove side access panel(s).
W W W . B A L T I M O R E A I R C O I L . E U
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