Pilz PSS SB HYD, Basic license - Manual (Page 47)

4-17 Modular Block System: Hydraulic Presses
WARNING!
The reaction time of the safety valve determines the stopping time of the
press on an emergency stop. The stopping time determines the safety
distance to the tool.
A dangerous situation can arise if parameters for the reaction times are
set values which are greater than the actual reaction time of the valves.
The detailed safety guidelines provided in the SB089 description (see
Chapter 6) must be adhered to at all times.
SB092: Enable switch
SB092 monitors three-position enable switches designed to protect
personnel where operating modes have safety devices suspended.
Application and use:
SB092 can be used for the following applications:
• For enable switches conforming to prEN 1921, 10/95 and VDE 2853,
07/87
• For three-position switches conforming to EN 692 section 5.3.19.4, 08/
96, and EN 693 section 5.3.17.4, 1995, with automatic reset and slow
closing speed (10 mm/s)
• For the documented switching diagrams
INFORMATION
Please bear in mind the following points (EN 1921, 10/95):
• An enable switch approves a dangerous movement but does not actually
trigger it.
• A potentially hazardous situation may not be initiated by the enable
switch alone.
• If an enable device is required, it must be connected to either a category
0 or category 1 stop
• If the switching device is fed back from stage 3 through stage 2 to stage
1, the enable function in stage 2 will not occur.
• It is possible to set a start-up and reset lock after feedback from stage 3.