Automatic Fill / Empty - FlowLine Smart-Trak AV23 Series Manual

Electrical (continued)
AUTOMATIC FILL:
This system consists of a tank with a high and low level sensor, and a pump or
valve that is operated by the controller. Proper fail-safe design for this system is to
stop filling if power is lost. Therefore, we connect the pump/valve to the NO side of
the relay. When energized, the device will activate and fill the tank. The relay LED
will correspond directly to the ON/OFF status of the pump/valve. NOTE: If the
pump motor load exceeds the rating of relay controller, a stepper relay of higher
capacity must be used as part of the system design.
Determining the settings of LATCH and INVERT: This is the way the system
must operate:

When both the high and low sensors are dry, the device should activate, starting to fill the tank.

When the low sensor gets wet, the device should stay ON.

When the high sensor gets wet, the device should turn OFF.
Latch: In any two-sensor control system, LATCH must be ON.
Invert: Referring to the logic chart in Step Nine, we look for the setting that will de-energize the relay (start the
pump) when both inputs are wet (Amber LEDs). In this system, Invert should be ON.
AUTOMATIC EMPTY:
Note that similar system logic can be used for an automatic empty operation simply
by controlling a pump/valve that takes fluid out of the tank instead of into it.
Connect the pump/valve to the NO side of the relay. When energized, the device
will activate and empty the tank.
Determining the settings of LATCH and INVERT: This is the way the system
must operate:

When both the high and low sensors are wet, the device should activate,
starting to empty the tank.

When the high sensor gets dry, the device should stay ON.

When the low sensor gets dry, the device should turn OFF.
Latch: In any two-sensor control system, LATCH must be ON.
Invert: Referring to the logic chart in Step Nine, we look for the setting that will de-energize the relay (start the
pump) when both inputs are wet (Amber LEDs). In this system, Invert should be OFF.
LM900006 Rev 0_3
Step Five
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