AEC Continuous Vacuum/Pressure Conveying Systems - Manual (Page 41)

Page 40 Single- and Dual-Blower Continuous Vacuum/Pressure Systems
CVP/CPP — Dual Blower Vacuum Pressure Systems
When the system is started, the pressure blower and rotary airlock energize and the
pressure blower starts to purge pressure-side material lines and builds up speed. At the
end of the period preset on a vacuum on delay timer, the vacuum blower energizes.
Material is drawn to the filter receiver or cyclone where it is stripped from the
conveying air and drops into a rotary airlock.
When the system is stopped in a non-emergency situation (purge stop), the vacuum unit
stops and allows the rotary airlock and pressure unit to continue conveying material,
purging pressure-side material lines. The purge timer shuts down the pressure unit and
rotary airlock after a preset period.
The system also goes into purge stop when level sensors in the cyclone, filter chamber,
or at the destination point detect a high level condition. You must restart the system
after the purge stop cycle.
The emergency stop button on the control unit shuts down all units in the system. The
system also goes into emergency stop when the high pressure sensor on the pressure
outlet senses high pressure.
Figure 11
Typical Vacuum/Pressure System Load Cycle