Pilz PSS SB HYD, Basic license - Manual (Page 193)

Modular Block System: Hydraulic Presses 6-131
• Monitoring the position of directional control valves:
With directional control valves, the position of the valve is monitored as it
is being operated. The valve must not register its start position while it is
being operated. If a directional control valve is correctly energised (input
parameter
ON = 1) and registers its start position while the valve output
is switched on (output parameter Y = 1), SB087 immediately switches off
the valve output (output parameter Y = 0) and registers a fault (output
parameter ENBL = 0 and ERR = 1). A reset will be necessary (see also
under “Error messages”).
INFORMATION
Directional control valves may only be operated where the position of the
valve is monitored by acknowledging the valve's position within a
maximum reaction time.
VTyp = 0
TOn = KF 001 ... KF 350
TOff = KF 001 ... KF 350
Ensure you follow the guidelines given under “Safety guidelines for
input parameters
TOn and TOff ”
• Registers an error when the valve is in the wrong position
• If an error occurs, the valve will be switched off immediately; it will not be
possible to reset the valve (reset disabled).
• After an error, a reset will only be possible if the error has been rectified,
the valve is in its start position (valve de-energised, acknowledgement
from valve is present) and no start signal is present (input parameter
ON •
1).