Interroll Drum motor series i, S, S/A, D
Assembly and installation
Version 4.1 (06/2015) en-US
Translation of original instruction manual
81
Belt tension
The following must be observed when calculating the belt tension:
• Length and width of conveyor belt
• Belt type
• The belt tension required for transporting the load
• The belt elongation required for the assembly (depending on the load, the belt elongation
for the assembly should measure between 0.2 and 0.5 % of the belt length)
• The required belt tension must not exceed the maximum belt tension (TE) of the drum motor.
The values for the belt tension and elongation are available from the belt manufacturer.
T
1
T
2
T
1
+
T
2
=TE
The required belt tension T1 (top) and T2 (bottom) can be calculated according to the
specifications of DIN 22101 or CEMA. Based on the information from the belt manufacturer, the
actual belt tension can be roughly determined by a measurement of the belt elongation during
tensioning.
The maximum permissible belt tension (TE) of a drum motor is listed in the drum motor tables of
the catalog. Belt type, belt thickness and drum motor diameter must match the information from
the belt manufacturer. If the diameter of the drum motor is too small, it can lead to damages to
the belt.
If the belt tension is too strong, it can damage the shaft bearings and/or other internal
components of the drum motor and shorten the service life of the product.
The belt tension is created by the force of the belt when it is stretched in longitudinal direction.
To prevent damages to the drum motor, it is absolutely necessary to measure the belt elongation
and to determine the static belt tensioning force. The calculated belt tension must be equal to or
lower than the values specified in the drum motor tables of the catalog.
With increasing the distance between idler
and drum motor the belt elongates
Belt elongation
Belt elongation
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