Sensor Fault
A sensor fault will appear when the time it takes for the liquids in the kegs to “clear” the drain
sensor during an evacuation cycle exceeds the time limit programmed into the “manifold clear
watchdog timer” setting in the PLC, normally 45 seconds. This can be caused by several things
including insufficient air pressure, excessive liquid in the kegs, or a faulty drain sensor. Pressing
“Repeat”, if kegs still have liquid in them, or “Proceed”, if kegs are empty, will allow the keg
washer to move on. Full or mostly full kegs may require pressing the "proceed” button 1 or 2
times to empty the kegs. “Reset” will start the entire cycle over.
If the sensor fault occurs immediately upon pressing the green start button, the PLC memory
for the “watchdog” timer has likely defaulted to “0”, usually after the machine has been sitting
unpowered for an extended period. Check the parameters and verify values.
• Verify proper air pressure is available to open the air valves (80-100 PSI) and does not drop
excessively during evacuation steps (below 60 PSI). Insufficient air pressure/volume can
prevent the valves from opening fully, resulting in longer evacuation times.
• Verify that the drain valve is open and the drain line is of sufficient size and unobstructed.
• Verify air and C02 pressures are at the recommended settings (30-40 PSI) and do not drop
excessively during evacuation steps. Insufficient CO2 pressure/volume can prolong the
evacuation of the sanitizer solution and pressurization of kegs, causing a sensor fault.
Custom (longer) rinse and/or wash settings will put more liquid into the kegs, resulting in longer
evacuation times. Shorten cycle times or lengthen “watchdog” timer. Running multiple, short
wash cycles are more thorough than running a single, longer wash cycle.
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