Carotron DIV280-000, Instruction Manual

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6
Description of Features & Adjustments
JUMPER J2
Selects the Output Mode between Voltage or Current. Position V on J2 selects the
Voltage Mode and the output is sourced from terminals 7 & 8. Position I on J2 selects
the Current Mode and the output is sourced on terminals 7 & 9.
BUILD RATIO Potentiometer
The BUILD RATIO is the ratio of maximum diameter to minimum diameter. The BUILD
RATIO potentiometer has a range of 1 to 20. Clockwise rotation increases the ratio.
INPUT Y TRIM RANGE Potentiometer
In the velocity mode application (where Roll Speed is calculated by dividing Line Speed
by Roll Diameter), a signal proportional to roll diameter (or radius) is required. When the
minimum and maximum signal levels are taught (see the Teach function), the DIV280-
000 module assumes the Zero Diameter and Max Diameter levels are used (points A
and C). Note that point A is the ‘zero’ diameter level which would correspond to the
center axis of the roll. With this type of signal, the normal operating range of signal
would be between points B and C (since the diameter should never fall below core).
During the teach process, the Zero Diameter point (center axis of roll) must be measured
or simulated. Often, it is easier to calibrate the diameter signal by teaching the Core and
Max Diameter levels. (points B to C). However, this introduces an error because the
module assumes the Zero Diameter point has been taught. The Y TRIM RANGE
potentiometer can be used to re-scale the signal so that the minimum input is treated as
the Core level instead of the Zero level.
Figure 4: Diameter Signal Examples
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