The User Interface
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A CTB constant entry field and an option to log speed problems will be visible. When
selected both reject delay in distance and dwell timing in time or distance must be set in
the Rejects Setup screen.
O
Freerun
Select this option when there is no transport system in use, other than the effects of
gravity. When selected, the reject dwell timing must be set in the Rejects Setup screen. A
DSP enable option will be visible.
Tap the arrow to the right of the field to display the drop down list of available speed mode
options and select the one to be used.
■
Belt speed
This field is displayed if the Fixed speed mode option has been selected. It is important for the
correct operation of the overall system that this entry reflects the actual conveyor speed. The
value can be in metres per minute or feet per minute depending upon the Units option selected
in the Search Head Setup
screen.
■ CTB constant
This field is displayed when the Variable Speed mode option is selected.
The value entered is derived from the relationship between the shaft encoder and
circumference of the roller to which it is fitted.
This parameter is the number of pulses (ticks) per metre/foot of belt travel. To calculate this
figure for entry into the CTB constant field, use either the following metric or imperial formula:
O
Metric systems
CTB = Encoder pulses per revolution x 100 x
π x d
Where: d = the diameter of the roller to which the encoder is fitted in millimetres.
O
Imperial systems
CTB = Encoder pulses per revolution x
π x d
Where: d = the diameter of the roller to which the encoder is fitted in inches. The number
of pulses provided directly relates to the transport speed. JP7 on the detector control
board must be set in position 1-2.
Tap in the field to display a pop-up numeric keypad and enter the CTB constant required.
■
Log speed prob
Because the detector can only work within a predetermined speed range it is possible for the
belt speed to move outside the limit of reliable operation of the machine. Selecting the Log
speed prob option will generate either speed too slow or speed too fast run errors to advise
operators.
Tap in the option check box to enable or disable this option.
■
DSP type
DSP stands for Digital Signal Processing. The following options are available for selection:
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