AEC VacTrac Series Conveying Systems - Manual (Page 40)

VacTrac™ Conveying Systems 12-Station Controllers Page 39
IDLE (No Activity)
The IDLE (No Activity) state acts as an energy saver and pump
lifetime extender. During this state, the atmospheric valve is open,
allowing the vacuum to be vented. All sequence valves are closed
and all inputs are monitored for demand activity. This feature
reduces repeated starting and stopping of pumps, extending pump
operation life.
If the controller senses a demand during the IDLE (No Activity)
state, the controller re-enters the LOADING state by closing the
vent valve and opening the sequence valve of the station in
demand.
If no demand exists in the system for the duration of the IDLE
(No Activity) time setting, the controller then enters the READY
state.
Note: IDLE is any condition in the conveying system when the
pump runs but no station loads.
READY
The READY state is a monitoring function. All outputs are off and
the controller waits for a demand signal to be fulfilled. If the
controller senses a demand condition, the controller then re-enters
the
STARTING state and returns to load material into the hoppers.
BLOWBACK
When enabled, the controller enters the BLOWBACK state
following a user-definable number of station loads. The blowback
function is to pulse air through the filter system to keep the filter
from clogging. The number and duration of the air pulses is also
user-definable; see the Blowback menu on Pages 54-58 for more
information.