KTR-SI with ROTEX®

Information on selection of torque limiters:

For an accurate selection of the torque limiters latest simulation and calculation programs are available. Please advise as many data of your drive as possible. The more accurate these data, the more accurate are the calculation results. Make use of these options and consult with us about the application beforehand.

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 (see diagramme).

Torque limiters and overload systems that re-engage automatically should be used with reduced speed with high release torques only. Frequent or longer slipping or ratcheting increases wear of the safety coupling.

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 KTR-SI 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.

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.

Overload coupling idle rotation version

When reaching the torque set the overload coupling releases. Driving and driven side keep separated due to the idle rotation mechanism, the resulting flywheel mass can slow down in idle state. After eliminating the overload, the coupling can be re-engaged. Re-engagement takes place either manually or via a device.

Overload coupling fail-safe design SGR:

The fail-safe design is purely intended for torque measurement without any slipping operation. In case of overload a signal is generated by a limit switch along with mechanical separation of driving and driven side = ratcheting is not possible.