Pilz PSS SB HYD, Basic license - Manual (Page 44)

4-14
Intended Use
Modular Block System: Hydraulic Presses
SB087: Driving/monitoring the position of a single hydraulic valve (poppet and
directional control valve)
SB087 is a standard function block which is designed to control and
monitor the position of a single hydraulic valve. The position of the valve
is acknowledged via an input.
Features:
• Input for selecting the valve type (poppet valve/directional control valve)
• Valves switched on in start position only
• Operation with or without reaction time monitoring
• An error message is issued if the valve is in the wrong position
• Valve is immediately switched off if an error occurs
• Reset latch when an error is detected
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 SB087 description (see
Chapter 6) must be adhered to at all times.
SB088: Driving/monitoring the position of a dual hydraulic valve (poppet and
directional control valve)
SB088 is a standard function block which is designed to control and
monitor the position of a dual hydraulic valve. The position of each valve
is acknowledged via a separate input.
Valves can be switched off individually for external overrun measurement.
Features:
• Input for selecting the valve type (poppet valve/directional control valve)
• Two valves controlled and monitored simultaneously