EVO 150 Controller
10
Note: The default calibration supplied with the system should work for most materials.
However, if the null indicator LED does not turn off, then the detector may need to be
calibrated. Refer to page 57 for calibration instructions.
Digital line guide: Position the sensor so that it is approximately centered over the
registration line or edge. Calibrate the sensor (refer to page 65 for calibration
instructions). When the sensor is calibrated and positioned correctly an indicator dot will
appear in the display under the line or edge you want to track.
e) Press the EDGE A, or EDGE B button to select the sensor under test.
f) Press the AUTOMATIC button.
g) Slowly move the sensor left or right and observe how the guide reacts. The guide should
move the web so that it follows (or chases) the movement of the sensor.
Edge detector: The guide should move the web so that the edge of the web is always
aligned with the edge detector’s guide point.
Digital line guide: The guide should move the web so that the line or edge pattern is
always aligned with the line guide’s sight point.
Note: If the guide does not follow the movement of the sensor and moves in the opposite
direction, then the sensor polarity (parameters 3 or 4) is not correct and must be
changed. Refer to page 21 for more information about setting controller parameters.
h) If the guide mechanism oscillates around the guide point or overshoots excessively when
steering in response to an abrupt change in web position, the servo gain (parameter 5) is
too high and must be lowered. Refer to page 21 for more information about setting
controller parameters.
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