Test Revs; Weigh Span; Test Weight - MERRICK Genetix Safety, Installation, Operation And Maintenance Manual

diameter of the pulley, etc. However, it will be accurately determined by the
Genetix controller during a Speed Span procedure (see Calibration > Speed
Span). You do not have to make an accurate calculation of this parameter and
enter it, but you may refer to it here.

Test Revs

(Main Menu > Calibration > Numeric Data)
This is the number of revolutions of the belt that will be counted for any and all of
the Calibration procedures. It should normally be at least 2, but may be set higher
for feeders with very high belt speed.

Weigh Span

(Main Menu > Calibration > Numeric Data)
This value represents the "Gravimetric Weigh Span", which is a factor that relates
load on the Load Cell(s) to Belt Load, as follows:
Load Cell load (lb, kg) = Belt Load (lb/ft, kg/m) X Weigh Span (ft, m)
The units are those of length, but this parameter cannot always be directly
measured. On a conveyor with equally spaced idlers it will usually be equivalent to
the distance between idlers, however, on some scales there are pivots and ratios
involved that complicate the calculation. Normally this parameter is calculated and
entered at the factory.
Note: This value will be updated (changed) if a Weight Factor (see Calibration >
Weight Factor) procedure is performed, for example after a Material Test (see
Calibration > Material Test). In this way, future Weight Procedures (see Calibration
> Weight Procedure) that are performed will check or update the controller
calibration based on the results of the Material Test.
This value must be correct if a Weight Procedure is to correctly calibrate the
controller.

Test Weight

(Main Menu > Calibration > Numeric Data)
This is usually the total value of the test weights applied to the scale during a
Weight Procedure (see Calibration > Weight Procedure). If weights are applied to
both sides of the scale or feeder, the sum of all weights should be entered here.
The units are those of weight (lb, kg) and the test weights should be stamped with
their correct value by the factory.
Note: Removable brackets, pegs, etc. that are used to hang the test weights must
be included in the sum. Normally all such pieces will be stamped with their correct
weight by the factory.
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