Bimba PCS - Manual (Page 28)

www.bimba.com Technical Assistance: 800-44-BIMBA 28
Poor Positioning on the First Cycle
Problem: Air pressure may have been lost during idle time, either through leaks or
disconnect of the air supply.
Solution: If extended periods of non-operation are normal, the application will require
a start-up routine for the initial cycle. This will stabilize pressures in the
actuator.
Repeatability/Stability/Responsiveness changes over time
Problem:
Solution: Input pressure has changed.
Changes in input pressure will effect actuator performance. Lower pressure
will typically reduce repeatability and increased pressure will typically
improve repeatability.
Problem:
Solution: External friction changed due to component wear or changes.
Re-adjust system parameters based on new frictional characteristics, or
restore friction to initial values (i.e., lubricate bearing surfaces, replace worn
components, etc.)
Problem:
Solution: If flow controls are utilized in the system, the initial setting has changed.
Re-adjust flow controls to initial setting. It may be helpful to lock the flow
control adjustment with the provided lock nut or thread lock.
Problem:
Solution: Improper actuator lubrication.
Lubricate actuator with recommended lubrication. See actuator catalog for
recommendations.
The Red or Green LED will not turn off
Problem:
Solution: The Red LED will not turn off.
The PCS electrical zero is set beyond the mechanical zero. Adjust the PCS
zero setting to correspond with the mechanical zero. If a mechanical stop was
added or changed after the initial zero adjustment was made, it will need to
be re-adjusted.
Problem:
Solution: The Green LED will not turn off.
The PCS electrical full scale is set beyond the mechanical stop. Adjust the
PCS span adjustment to correspond with the mechanical stop. If a mechanical
stop was added or changed after the initial span adjustment was made, it will
need to be re-adjusted.
The PCS system always makes a popping noise, even when in position
Problem:
Solution: There are air leaks between the valves and the actuator.
Fix any leaks between the valve and the actuator. The PCS system will
compensate for leaks in the system. The popping noise is the valves actuating
to maintain position.
Problem: The command signal may be generating excess noise.