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The force required to drive a conveyor must be transmitted from the pulley to the belt; therefore, the belt approaching the pulley will have a different tension (T1) than the belt departing the pulley (T2). The amount of belt tension that can be effectively transmitted by a drive pulley is a function of the coefficient of friction (which is dependent on the pulley surface or lagging selection), the amount of wrap the belt has around the pulley, and the values of belt tension. Belt slip is the loss of traction between the drive or brake pulley and the belt cover.

•The wrap factor (T2/Te) is a mathematical value expressing the amount of effective belt tension (Te) that can be developed.

•The slip ratio is the ratio of the T1 to T2 belt tension at which it is expected slip will occur. This value should be compared to the actual T1/T2 value to judge the potential for slip in the running, accelerating, or braking case being evaluated.

The values are displayed in the drive data spreadsheet for each of the drives and brakes.

See also: Drive Details