Servomech ATL 02, Installation, Operation And Maintenance Manual, Page: 14 / 21

Servomech S.p.A. 02.02-05-08-10-11-12.E - Rev. 00 Date (M/Y) 12/19 14
6.5 Safety clutch FS
Safety clutch device is available only for actuators ATL 08-10-10 and BSA 08-10-11-12.
The safety clutch is a device able to protect the actuator and the machinery where it is installed from dynamic
overload during the linear travel and from incorrect use which could bring the actuator to the mechanical
stop. This device is a torque limiter on the worm wheel.

The torque limiter clutch is preloaded during assembly.

The preload is fixed and related to the ratio and the performances of each actuator as stated on the
performance tables in the catalogue.

On request, a different preload can be set to achieve different performance.

If an overload is applied on the actuator, the safety clutch starts slipping and the push rod stops while
the motor is still running. When the overload decreases up to the rated load value or less, the safety
clutch stops slipping and the push rod starts travelling again.
The safety clutch FS is not intended to be used as a load limiter, but only to protect the actuator and
the machinery where it is installed.
DO NOT USE THE SAFETY CLUTCH AS A STROKE END CONTROL DEVICE! If it is frequently activated it
rapidly wears, the preload is reduced and consequently also the actuator load performance is lower.
Figure 6.4 – Safety clutch FS