6. Autostart Operation
– Start and stop via transducer level
• Transducer with backup switches
– Start and stop via transducer level
– Switches as backup start and stop if there is a transducer failure
• Scheduler
• Timed run
– Manually started
– Automatically stopped by countdown timer
– Can maintain a level while running
The following table describes the Start/Stop events when behavior operation is set to ”High to Low”
(switches/floats are normally open):
Start/Stop Events Engine Starts When Engine Stops When
Single Switch SW1 is closed SW1 is open
Dual Switch
SW1 and SW2 are both closed
SW1 and SW2 are both open
Transducer Input is above high set point Input is below low set point
Transducer with Backup
Switches
Input is above high set point;
Dual Switch mode if Trans-
ducer fault is detected
Input is below low set point;
Dual Switch mode if Trans-
ducer fault is detected
Scheduler Date and Time occurs Date and Time occurs
Timed Run Autostart switch pressed Timer expires
The following table describes the Start/Stop events when behavior operation is set to ”Low to High”
(switches/floats are normally open):
Start/Stop Events Engine Starts When Engine Stops When
Single Switch SW1 is open SW1 is closed
Dual Switch SW1 and SW2 are both open
SW1 and SW2 are both closed
Transducer Input is below low set point Input is above high set point
Transducer with Backup
Switches
Input is below low set point;
Dual Switch mode if Trans-
ducer fault is detected
Input is above high set point;
Dual Switch mode if Trans-
ducer fault is detected
Scheduler Date and Time occurs Date and Time occurs
Timed Run Autostart switch pressed Timer expires
Transducer Fault Detection using Backup Switches
LOFA document No. 463-3002-59 Page 25
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