Festo CPV -VI Series, Manual

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Checking the valve-cylinder combination
WARNING
When pressurizing or repressurizing the valve termi-
nal under the following conditions:
– with safety start-up valve
(slow pressure build-up) and
– when there is an electrical signal
(e.g. after EMERGENCY STOP)
supply the auxiliary pilot air separately (3 to 8 bar).
The auxiliary pilot air must reach its full level immedi-
ately after being switched on, otherwise the slow press-
ure build-up of the overall supply will have no effect
with cylinders actuated as follows:
– by means of single solenoid valves
– by means of double solenoid valves which are
switched to flow-through during the pressureless
phase.
The effects of slow pressure build-up when there is an
electrical signal are shown in the table below.
Separately
supplied auxiliary
pilot air Pressure
increase in
overall supply Pressure
increase in
auxiliary pilot
air (12/14) Moment when
valve switches
over Movement of
cylinder
taken behind safety
start-up valve slow slow after pressure
increase at (1) fast
taken in front of
safety start-up valve slow fast before pressure
increase at (1) slow
4. Commissioning
CPV... 9811d
4-7