American Magnetics 286 Multi-Sensor Liquid Level Instrument (CE-Marked) - Manual (Page 55)

41
Operation
Fill timeout
b. ON: With ON selected in the FILL menu, the rear panel AC
output for the channel will become energized, thereby initiating
flow if the solenoid-operated fill valve is properly connected.
The FILL LED on the front panel will energize, indicating the
presence of power at the rear panel receptacle. The operator is
solely responsible for terminating the fill flow.
c. AUTO: With AUTO selected in the FILL menu, the Model 286
is capable of automatically initiating and terminating liquid fill
via the control valve(s), thereby maintaining the level between
the selected A and B setpoints. If the liquid level falls below the
B setpoint, the appropriate rear panel AC output and front
panel FILL LED are energized. When the liquid level
subsequently reaches or exceeds the A setpoint, the AC output
is de-energized and the FILL LED is extinguished.
Note
When ON is selected and a valve is connected to the AC output, the
valve is actuated immediately. If this is not desired, then disconnect
the valve from the output before changing the fill state.
4.1.6.2 Fill timeout
The various FILL menus provide a fill timeout feature to help
alleviate the possibility of liquid overflow. See paragraph 4.3.7 on
page 46 for details of the FILL menu screens for the various
controller modes.
The fill timeout feature is enabled when the instrument is operated
in the AUTO mode with a fill timeout setting greater than zero.
Once the liquid level falls below the B setpoint, an internal fill
timer (whose period is the timeout setting) begins to increment. If
the liquid level does not reach the A setpoint before the timeout
period expires, the FILL LED will begin blinking and power to the
associated rear panel AC output will be interrupted. To reset this
function the fill mode must be momentarily changed to the ON or
OFF state via the keypad or remote interface, or power to the
instrument must be cycled.
Note
The fill timeout function is disabled when the timeout setting is zero,
i.e. the Model 286 will continue to fill the target vessel indefinitely
until the A setpoint is achieved. Adjusting the fill timeout setting to
zero, while an AUTO fill is in progress, will also terminate any in-
progress functions of the timer.
Ch 1 & 2