Information on selection of torque limiters

To make sure that the torque limiter is not released with process-related torque peaks, the switching torque of the coupling should at least be 30 % above the maximum operating torque.

Torque limiters and overload systems that re-engage automatically should be used with reduced speed only after having applied higher release torques. Frequent or longer slipping or ratcheting increases wear of the torque limiter.

After the torque limiter separated driving from driven side in case of overload, it may take some time before the drive stops due to large inertias in the drive train. This may generate high wear of the torque limiters and overload couplings that re-engage automatically. That is why we recommend with drives with large mass inertias or higher speeds to use the safety coupling  as an idle rotation version.

We basically recommend electrical monitoring of the torque limiters to disengage the drive immediately in case of overload. We will be pleased to assist you with any technical questions about the selection of torque limiters.

Here the principle applies: The more detailed the data provided, the more accurate the calculation results.

Function

Overload coupling ratchet design DK:

Any engagement after an overload. After eliminating the overload, the balls re-engage automatically with the next following ball indentation.

Overload coupling synchronous design SR:

Synchronous engagement after an overload. After eliminating the overload, the balls re-engage automatically after a rotation of 360°. Driving and driven side are always placed in the same position to each other. Other degrees of reengagement, e. g. 180°, are possible.