AEC VacTrac Series Conveying Systems - Manual (Page 38)

VacTrac™ Conveying Systems 12-Station Controllers Page 37
6 General Operation
6-1 Overview
Your VacTrac™ Series 12 station controller electrically controls
valves and solenoids to convey material from a central location to
individual stations as needed. The controller works within this
process by sensing a material demand and respond in a timely
fashion to that demand.
An active signal sent from a demand sensor prompts the controller
to place the station in a demand queue. The controller responds to
this condition by loading the stations in a first come, first served
basis. This is the most efficient manner of conveying material to
different-sized stations.
The basic sequence of a normal load operation is:
1. Sense the demand from a station.
2. Add that station demand into the queue.
3. When required, remove the station from the queue.
4. If required, start the vacuum pump.
5. Open the sequence valve.
6. Load the station until the volume sensor activates or load
time expires.
7. Close the sequence valve.
8. Continue on to load the next station in the queue.
9. If no demand is present in system after a short delay, then
shut down the system vacuum pump.