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12. Potentiometers
a) Up to three potentiometers can be fitted, depending upon the type of machine.
P1 is the potentiometer at the centre of a chain pulley to measure the distance from the edge of
the machine to the first weight position and depending on the type of program selected, the
second weight position. The potentiometers have a value of 10kOhm/20%/340°.
b) The potentiometers have an internal mechanical stop position, which is important to note when
fitting them to the relevant gauge. The movement of the gauge should not be greater than the
stop position otherwise it could damage the potentiometer. The distance potentiometer is
connected to J8-1to J8-4. In order to remove it, the complete chain pulley and chain should be
removed by loosening the screws securing it to the cabinet wall. When replacing a potentiometer
into the chain pulley, make sure that the potentiometer spindle is turned anti clockwise to almost
the position stop. Thereby, when the chain pulley is fitted together with the potentiometer, they will
be able to both turn clockwise to the chain pulley position stop
The contact no. 1 on the potentiometer take the white coloured wire and no. 2 the green wire, with
no. 3 taking the brown wire.
Contact colour 1 ws 2 gn 3 bn
c) Note: Make sure that while fitting the chain, the gauge is in the home position and the chain
pulley is at the stop position shown by the screwed bolt on the pulley contacting a limit stop. The
potentiometer spindle should also be shortly before the left hand mechanical stop position.
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