Loma IQ3+ST, User Manual

Page: 154 / 247

The User Interface
144

PEC length
To ensure the correct operation of the detector and reject systems it is extremely important to
ensure that this setting is correct.
The calculation for this entry measured in mm or inches depends on the Units option selected
in the
Search Head Setup screen. It is calculated as follows:
1. Measure the distance from the Product Registration Photo-eye to the face of the detector
(L).
2. Measure the depth of the detector case (D).
3. Note the (Rx) distance recorded on the detector serial plate located behind the detector
control panel cover.
4. Put the values into the formula - PEC length = A + (0.5 x D) + Rx.
5. Tap in the PEC length field to display a pop-up numeric keypad, then enter the value as
required.

PEC block packs
If the Product Registration Photo-eye is blocked for the selected number of packs, the
detector will identify this as a fault. Any number of packs may be entered but the default is 6.
Tap in the field to display a pop-up numeric keypad and enter the required number of packs.

Speed mode
There are three options available for selection as follows:
o
Fixed
Select this option if you are using a fixed speed conveyor system. When selected, both
reject delay and dwell timing must be set in the Rejects Setup screen.
o
Variable
Select this option if you are using a conveyor system where the speed is variable or can
be stopped from an external control source. When in use the conveyor drive will have a
shaft encoder fitted that provides timing pulses to the detector electronics whilst the
conveyor is running. 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.