User guide

AccuMeter Controller Chapter 11: Configuring a new PLC 67
ALARM SETUP Tab
• NO FLOW ALARM ENABLED/DISABLED. This alarm occurs if the feeder is
running and the system does not detect weight loss. This could happen if there was a
material bridge in the hopper. RUN on alarm means that you want the blender to
continue running regardless of this condition. STOP on alarm means that you want the
blender to shutdown if this condition is detected.
• NO FLOW TIME (SECONDS). This is the sample window that is used in determining
if a no flow condition occurs. A weigh snapshot is taken every X seconds and the
change in weight bits is compared with the NO FLOW BITS setting. Making the time
too small will cause nuisance alarms. Making it too long will delay you receiving the
alarm, but will generally not cause a problem. Default is 30 seconds, but should be
increased on very low rate hoppers.
• NO FLOW BITS. This is the number of weight bits that the system must see change
over the NO FLOW TIME (SECONDS) or the system will generate a NO FLOW
ALARM. Making this number too big will cause nuisance alarms. Making this
number too small will prevent the alarm from ever occurring and basically disables the
alarm. Default is 20.
• RELOAD TOO LONG ALARM ENABLED/DISABLED. This alarm occurs if it
takes more than 30 seconds to reload the weigh hopper.
• NO MATERIAL ALARM ENABLED/DISABLED. This alarm occurs whenever the
hopper weight is below the EMPTY % (Feeder Setup page). There is a 30 second
delay after first starting the blender to allow the system to prime.
• LOADCELL ALARM ENABLED/DISABLED. This alarm occurs if either the
loadcell is disconnected or is mechanically negative sprung (reading negative). If you
disconnect a loadcell the CURRENT BITS (Calibrate Scale page) will go to 32767.
This alarm will not detect a non-linear or damaged loadcell and is not intended to
replace standard scale calibration and testing procedures.