Belt Speed - Loma IQ2 Service Manual

CONTROL LINE FUNCTIONALITY
OUT = +8V reference to 0V
Following is a table detailing control line function and effect.
Control line
Ctrl 1 Switches a resistor directly across the receiver search head amplifier.
highest
Reduces both product signal and metal contaminant signal regardless of mode
resistor
of operation.
value
Ctrl 2 Switches a resistor directly across the receiver search head amplifier.
Reduces both product signal and metal contaminant signal regardless of mode
of operation.
Ctrl 3 Controls the gain of the resistive channel only.
Reduces product effect for conductive products when detector is working in
Reactive.
Increases or reduces metal contamination signals for non-conductive products
when the detector is working Dry or Resistive.
Ctrl 4 Switches a resistor directly across the receiver search head amplifier.
lowest
Reduces both product signal and metal contaminant signal regardless of mode
resistor
of operation. Normally associated with metallised film packaging or products
value
that have very large/inconsistent product effects.
Control lines 1,2 & 4:
Control line 3:

BELT SPEED

The detector electronics use DSP Digital Signal Processing techniques in order
to ensure optimum performance of the detector when a driven transport system
is used. The control board has 4 identical resistors whose values are selected
according to the speed at which the product travels through the aperture and the
entered Coil Gap value, which is determined by the smallest aperture
dimension.
Fixed "Fixed" or variable "Vble" speed driven systems i.e. "Conveyor" type
systems require the speed of the transport system to be entered. The speed that
can be entered is governed by the filter resistor value selected in the
Module 7026
Configuration and Set up Information
IN + 0V reference to 0V
Function and effect
Resistor values are standard factory set
components that decrease in value, therefore
increasing their effect.
The resistor values are standard factory set
components.
5-14