Bimba PCS - Manual (Page 26)

www.bimba.com Technical Assistance: 800-44-BIMBA 26
Problem:
Solution: Excessive air leak in the actuator or PCS system.
Find and fix the leak. External fitting leaks are relatively easy to find. Use a
solution, such as Leak Tech, to identify leaks in fittings, couplings, and rod
seal (if linear actuator). Check for leaks in the actuator seals.
Problem:
Solution: PCS valves are contaminated.
Unfiltered air (>5 microns) can cause the valves to become contaminated
causing them to leak. Use a filter that is rated for <5 micron particles. Thread
tape can also cause leaks in the valve if the tape becomes loose and enters the
system. It is recommended that a solid or liquid thread seal be used.
Problem:
Solution: The actuator feedback potentiometer is malfunctioning.
Replace the feedback potentiometer. See respective catalogs for part number
information.
Problem:
Solution: Actuator seals are worn or contaminated.
For PFC applications, order an RPFC (Cylinder with no probe) and replace
existing cylinder (You may use the existing probe if it is still in working
order).
For PTF applications, order a seal repair kit (Part numbers are in the PTF
catalog) and replace the worn or contaminated seals.
Problem:
Solution: Excess friction is being exerted by application components.
Reduce the friction to levels outlined in the installation section of the
manual. External friction may change as system components wear over
time. Misalignment between the actuator and guiding system may
cause binding and increase friction to unacceptable levels.
Problem:
Solution: Varying loads in application.
Stabilize the load variation. If loads cannot be stabilized, the deadband may
need increased to improve performance.
Problem:
Solution: Excessive velocity due to flow control misadjustment.
Some applications require flow controls to limit velocity in order to attain
required repeatability. The flow controls may have been adjusted after initial
settings were made. Re-adjust to proper settings.
The Actuator Moves Slower than Sizing Chart Indicates
Problem:
Solution: Inadequately sized air line between the actuator and PCS valves (tube
diameter is too small).
Application testing yielded best results with 0.093 I.D. air line tube for
1-1/16" and 1-1/2" bore actuators and 0.170 I.D. air line tube for 2" bore
actuators. Smaller or larger I.D. tubing may result in less position
repeatability.
Problem:
Solution: The actuator and PCS system are not sized properly.
Refer to the Application Sizing Chart in the PCS catalog to ensure the
actuator and PCS system are sized properly for the application requirements.