Festo VTSA Series Description page 35

1. Overview of components
Festo P.BE−VTSA−44−EN en 0905e
The piston position of the soft−start valve can optionally be
monitored by an inductive sensor (N/O contact). This sensor
registers whether the valve has switched and therefore
whether the valve terminal is being supplied with air. Due to
the required calibration, the later addition of the sensor by
the customer is not intended. A pressure gauge is optionally
available as a pressure indicator.
Note
The VTSA valve terminal can be fitted with a maximum of
5 soft−start valves.
If a soft−start valve is used in the VTSA valve terminal, no
further pressure−supplying components may be used in
the same pressure zone.
Exhaust air cannot be expelled via the soft−start valve. If
a pressure zone is operated with a separate duct (1) and
3/5 port, an exhaust plate is required in this pressure
zone.
Instructions for combining the soft−start valve, pneu
matic supply plate and the right end plate can be found
in the VABV−S6−1Q−... assembly instructions.
Additional information on the valves can be found in
Appendix B.
1−19