Ross Controls CATEGORY 4 - 5_2 VALVES CROSSMIRROR SERIES 77 - Manual (Page 10)

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OPERATING INSTRUCTIONS
Pressure failure test
The valve is in the at-rest position. Turn off operating
pressure at port 1 and exhaust the operating
pressure line. Actuate the valve in the normal way
(solenoids A and B in t < 0,5s), and keep the
solenoids energized. Then apply operating pressure
to port 1 again. The piston is not supposed to leave
its position. For checking the check valve in port 1,
close and exhaust the operating pressure line. If
the check valves close properly, the piston will not
move downward quickly. Depending on the intensity
of usage, the check valves should be checked at
three month’ intervals.
Malfunctions
In case of malfunctions, we recommend to check/
exchange the double valve immediately.
Maintenance, testing
Maintenance and testing procedures must follow
the rules and guidelines set by the respective nati-
onal work-safety institutions. These procedures
should only be performed by persons trained and
experienced in the use of pneumatic equipment. It
is recommended that maintenance and test
procedures be performed at least once a year,
unless otherwise specified.
Repair
It is recommended that double valves which need
to be serviced be handed over to a ROSS service
point. Customers maintaining their own repair
service have to make sure that only original spare
parts (as specified in the ROSS parts lists) be used.
Pneumatic equipment should be repaired only by
persons trained and experienced in the repairing of
such equipment, guided by these operating
instructions. Information about valve repair and/or
the exchange of a valve must be written down in
the machine operation documentation.
Start-up
Prior to start-up, the installation must be checked thoroughly by persons trained and experienced in the
operation of pneumatic equipment.
Make sure that the maximum operating pressure specified on the valve
label will not be exceeded. When operating pressure is applied, the cylinder piston must move into the at-
rest-position. For further testing, a
functional test as well as a pressure failure test must be performed.
Functional test
Test Result
1. Actuate solenoid A Piston does not move
2. Actuate solenoid B Piston does not move
3. Actuate solenoid A, then actuate
solenoid B after t > 0,5s Piston does not move
4. Actuate solenoid B, then actuate
solenoid A after t > 0,5s Piston does not move
5. Actuate solenoids A and B after t < 0,5s
then de-energize solenoid A and Piston moves, but returns to at-rest-position after solenoid A
re-actuate after t > 0,5s is de-energized, and remains in that position
6. As under 5., however, test to be
performed with solenoid B See result 5
5/2-Way Double Valves
with C ROSS M IRROR ® -Sensing