Chain Procedure - MERRICK Genetix Safety, Installation, Operation And Maintenance Manual

Chain Procedure

(Main Menu > Calibration > Chain Procedure)
This is one of the available procedures that "span" the feeder calibration, or set its
Scale Factor. Scale Factor is the parameter that relates counts from the Load Cell
A/D (analog to digital) converter to belt load units (i.e. lb/ft or kg/m). Scale Factor will
vary from feeder to feeder, depending on load cell size, weigh span, etc.
The Weight Procedure requires the placement of a certified test chain onto the feeder
belt, usually as provided by Merrick. For assistance with correct use of a Test Chain
refer to the feeder Instruction Manual and/or the mechanical drawings provided by
Merrick.
Selection of this procedure from the above menu presents a screen that advises you
to verify that the correct Test Chain is applied to the feeder and the current status of
the test (0.0%). The value of the Test Chain is shown and should be verified. To
change this value see Main Menu > Calibration > Numeric Data > Test Weights.
Note: The Calibration procedures do not start the belt automatically. Before starting
this procedure you must start the belt and see that the test Weights are in position.
Also the belt should be allowed to run for at least 30 minutes if starting from cold.
From this screen, you simply press the Enter key to start the procedure, or the
Menu/Esc key to cancel. Once the procedure is started, the percentage indicator will
begin to increment, and the horizontal progress bar at the bottom of the screen will fill
from left to right.
Once the procedure is complete (100.0%), a new screen will be displayed with the
following data:
Diff [x] 00.00%
Curr: [x] 10000.00
New: [x] 10000.00
Press to Accept test
Press "Menu/Esc" to reject test
Note: The subscript [x] refers to the load cell number, i.e. 1 or 2 (if two load cells are
configured)
The percentage difference ("Diff") is shown on the first line, and represents the
difference between the current Scale Factor, and the results of this procedure,
relative to the current Scale Factor.
The current Scale Factor ("Curr") is shown on the next line.
The new Scale Factor ("New" is shown on the third line. This value will become the
current Scale Factor if the results of this procedure are accepted.
To accept the results of this procedure, press the Enter key. If you do not wish to
accept the results, and leave the Scale Factor value un-changed, press the Menu/Esc
key.
Whichever key is pressed at this point, you will be returned to the Chain Procedure
start screen so that you may easily run another procedure if desired. It is
recommended that you run more than one test to verify that the feeder is repeatable.
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