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2–Pump 12-Station Controllers Chapter 4: Operation 40
4-3 Operation
Your 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 responds 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.
Operation States
Label Description
OFFLINE
The OFFLINE operation state is the default state at the point when you apply
power to the controller. While in this state, all outputs in the system are
deactivated and access to the menu system is permitted. All station demands
are ignored.
IDLE (Startup)
If you press the START/STOP key in the OFFLINE state, the controller
enters the IDLE (Startup) state. If no demand is on the system, the controller
immediately enters the READY state. With a valid demand, the IDLE
(Startup) state allows the pump to get up to speed before starting to load a
station.
While in the IDLE (Startup) state, all station sequence valves are closed and
the vent valve is open. The vent valve allows the vacuum pump to vent to
atmosphere, keeping the system from becoming depressurized.