Bimba PCS - Manual (Page 9)

www.bimba.com Technical Assistance: 800-44-BIMBA 9
Installation Instructions
Before installing your system, refer to the Application Sizing and Rules of Thumb section
to ensure your system is sized properly for your application. Use the following steps to
successfully install and operate your PCS system. There are a couple of application
examples that follow this section which are helpful in gaining a full understanding of the
adjustments that will be made.
1.
INSTALL THE BIMBA ACTUATOR
Install the actuator as you would any other actuator, ensuring that the feedback
cable routes away in a careful and protected manner.
2.
MOUNT THE PCS
Select a mounting location for the PCS not more that 18 inches from the actuator
if possible. Positioning accuracy and efficiency improves when the PCS is
mounted close to the actuator. Be sure to allow sufficient room for both the
pneumatic connections and the electrical connections on opposite sides of the
PCS enclosure. Drill four mounting holes (for up to 5/16 diameter mounting
bolts) and secure the PCS in position by the enclosure’s mounting flanges.
Option-N (No Enclosure)
If Option-N is specified, the PCS system will be shipped with the PCS printed
circuit board, a snap track, a valve manifold, and four 25 foot valve cables. The
snap track allows for easy mounting inside a larger enclosure box. Mount the snap
track in the enclosure and snap the PC Board in place. Mount the valve manifold
near the actuator. Be careful to mount the manifold in a place where the valves
will not be vulnerable to physical damage.
3.
MAKE THE PNEUMATIC CONNECTIONS
The supply air must be 70 to 80 psi. Air supply pressure affects system
performance, not just force. Air must be filtered to 5 microns and regulated, and
the connections must be leak free. Leaks of any kind in the plumbing wil cause
the PCS to adjust to make up for this air loss, creating unnecessary wear on the
valves and generating chattering that might be interpreted as a malfunction. All of
the pneumatic fittings, tubes, etc., must seal perfectly. For a perfect seal, push-in
fittings with O-rings inside perform well. If Teflon tape is employed, care must be
taken to ensure that loose pieces don’t get into the system. Liquid thread sealants
must not be used; they can attack the materials of the transducer. It is also
important that tubing used between the PCS valve manifold and the actuator does
not expand with pressure. Volume changes, even though slight, will cause the
system to work harder. Metal tubing is the best, but nylon is also satisfactory. Do
not use very soft, easy to expand tubing like Tygon®.
Pressures above 100 psi may damage the PCS control’s valves.
Pressures below 70 psi may result in erratic operaion.