Pilz PSS SB HYD, Basic license - Manual (Page 201)

Modular Block System: Hydraulic Presses 6-139
Function
• The valves can only be switched on if both valves are in their start
position (input parameter S1 = 1 and S2 = 1, valve de-energised,
acknowledgement from the valves is present) and input parameter
Y1On = 1 and Y2On = 1.
• The valves can be switched off individually to enable external overrun
measurement.
Overrun measurement for Y1:
- Input parameter Y1On and Y2On = 1
- Switch on valves via input parameter ON
- Switch off valve Y1 via input parameter Y1On = 0 to enable overrun for
Y1 to be measured
- Switch off valve Y2 via input parameter ON = 0
Overrun measurement for Y2:
- Input parameter Y1On and Y2On = 1
- Switch on valves via input parameter ON
- Switch off valve Y2 via input parameter Y2On = 0 to enable overrun for
Y2 to be measured
- Switch off valve Y1 via input parameter ON = 0
• Key to settings at Y1On and Y2On
Y1On = 0 Y1On = 1
Y2On = 0 Invalid combination Overrun measurement
Error Y2 switched off
Y2On = 1 Overrun measurement Normal
Y1 switched off working mode
• In order to detect shorts, valve Y2 is switched on one PSS-cycle after
valve Y1.
Both valves are switched off simultaneously.
• Monitors position through acknowledgement of the valves' position (input
parameters S1 and S2) within a maximum reaction time. The reaction
time for switch on and switch off may be selected individually.
- Reaction time when switching on the valve:
When switched on, the valves must leave their start position within a