Safety switches stop machines from trapping people
An
Euchner (UK) product story
Edited by the Engineeringtalk editorial team
Mar 3, 2009
Euchner has released the TP and STP safety switches, which ensure machine compliance with the latest European Machinery Directive regarding 'risk of being trapped in a machine (code 1.5.14)'.
The new directive (2006/42/EC) will become effective on 29 December 2009 and states: 'Machinery must be designed, constructed or fitted with a means of preventing an exposed person from being enclosed within it or, if that is impossible, with a means of summoning help'.
The standard TP and STP safety switches ensure guard devices cannot be opened with machines in operation and remain closed until all potentially hazardous moving parts have stopped.
These switches are optionally available with a manual emergency release mechanism located at the rear of the switch housing.
To prevent the people being trapped in an individual machine or machining-cell enclosure, however, these switches can be adapted to incorporate an integrated bistable solenoid, operated from a separate supply voltage, which provides actuation and condition-monitoring of the guard locking.
The TP-Bi and STP-Bi types are versions of the Euchner safety switch range that incorporate the bistable solenoid feature.
The STA and twin-headed switches are also capable of the same adaptation, without alteration to their original housing dimensions.
Other provisions must be made, however, where switches are fitted in inaccessible positions, or where guard devices could trap personnel outside the reaching distance of appropriate safety devices.
In these circumstances, switches can be provided that incorporate a flexible Bowden cable for escape or emergency release of the guard locking mechanism.
The cable, combining inner wire and sleeve, can be supplied in lengths up to five metres and can be routed to cover individual installation requirements.
The cable is supplied with a convenient ring-pull, but this can be replaced with a more substantial pull handle if the cable needs to be routed through a machine bulkhead, rigid partition or guarding.
A pre-assembled Bowden cable emergency release mechanism incorporating replacement switch-cover is also available as a retro-fit item for Euchner TP and STP switches where they have already been built into existing safety circuitry.
This will ensure that even currently operating machine installations can be upgraded to comply with the latest machinery directive requirements.
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