Pilz PSS SB HYD, Basic license - Manual (Page 213)

Modular Block System: Hydraulic Presses 6-151
Function
• It is only possible to switch on one valve (Y1 or Y2) if both valves are in
their start position (input parameter S1 = 1 and S2 = 1, valve de-
energised, acknowledgements from the valves are present) and input
parameter
StEn = 1.
• Key to settings at Y1On and Y2On
Y1On = 0 Y1On = 1
Y2On = 0 Both valves are Valve Y1 is
switched off switched on
Y2On = 1 Valve Y2 is Invalid combination
switched on
• Monitors position through acknowledgement of the valves' position (input
parameter S1 / 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 valve must leave its start position within a
maximum time (reaction time). The maximum reaction time when
switching on the valve can be set via the input parameter
TOn (for both
valves). If the maximum reaction time is exceeded, an error message
will be issued (output parameter
ENBL = 0 and ERR = 1) and the rele-
vant valve will switch off immediately (output parameter Y1 = 0 / Y2 =
0). A reset will be necessary (see also under “Error messages”).
- Reaction time when switching off the valve:
When switched off, the valve must reach its start position within a
maximum time (reaction time). The maximum reaction time when
switching off the valve can be set via the input parameter
TOff (for both
valves). If the maximum reaction time is exceeded, an error message
will be issued (output parameter
ENBL = 0 and ERR = 1) and a reset
will be necessary (see also “Error messages”).
INFORMATION
Both valves are monitored using the same parameter for switch-on and
switch-off. If you are using structurally separated valves you must make
sure that these have a similar switching characteristic.