Bimba PCS User Manual
Page 27
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Technical Assistance: 800-44-BIMBA
27
Problem:
Solution:
Air lines between the actuator and PCS valves are too long.
Longer air lines cause the system to be less accurate or respond slower.
Always use the shortest possible lines as possible (<18"). The system will
work with longer lines, but may not be repeatable enough for application
requirements. Option N allows you to mount the valves close to the actuator
with the PCS electronics mounted separately.
Problem:
Solution:
Air Supply pressure is too low (below 70 psi).
Turn air supply up to at least 70 psi. Low air pressure can cause the actuator
to slow down. If the air supply experiences pressure drops due to excess air
demand in the building’s air supply system, an air reservoir may be required.
Problem:
Solution:
The Electrical Power Supply is supplying less than the required 23.5 VDC.
Utilize a DC power supply that can supply the minimum 23.5 VDC required
by the PCS. At voltages less than 23.5 VDC, the system performance will
degrade.
Problem:
Solution:
Decreased 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.
Problem:
Solution:
Excess friction is being exerted by application components.
Reduce the friction to levels outlined in the installation section of the manual.
Problem:
Solution:
PCS system parameters are not adjusted properly.
Follow the Installation instructions to make the appropriate system
adjustments for your application parameters, ensuring that the deadband
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 and decel adjustments are
adjusted according to the application requirements. An unnecessarily wide
deceleration zone will result in lower average velocities.