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Good candidates for Zero Tracking are those feeders or conveyors that
occasionally run empty for the period of time necessary to perform a Zero test, and
those belt scales that require the utmost accuracy (i.e. certified scales).
Following are the list of parameters involved in Zero Tracking, and how to properly
set them.
To enable Zero Tracking, you must first select Zero Tracking from the
Configuration menu, and enable it (set it to “Y(es)”. Once enabled, the following
settings will be found:
Load Limit ↑
Wait Time
Increment Limit
Absolute Limit
Start Delay
Splice Allowance ↓
Load Limit
This value is used to determine whether or not the belt is truly empty. If the
measured belt load drops below this value, the “Wait Time” timer starts (see
below). If the belt load exceeds this value anytime during the “Wait Time”, then
the current Zero Track process is abandoned. Once the belt load drops below
this limit again another “Wait Time” period is started. The units for this
parameter are those of Load (i.e. lb/ft, kg/m).
Note: An exception can be made for belts with a bad section (i.e. a mechanical
splice) that might normally cause abandonment of a Zero Track process (see
“Splice Allowance” below).
Wait Time
The “Wait Time” value is the delay time that the controller will wait after all
conditions have been met before actually beginning a Zero Tracking sequence.
For example ,the belt must be running empty (see “Load Limit” above) and the
“Start Delay” (see below) must have expired before the process of zeroing the
belt will begin. Units are seconds.
Increment Limit
This parameter is the maximum allowed incremental change of the Zero Load,
as the result of any one Zero Tracking process. If the calculated correction is
above this parameter then no change is made. The units for this parameter are
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