Lock on Lost Edge
For some applications it may be necessary to prevent the actuator from moving when a web edge is not
seen within the sensor window. By setting this parameter to ON the actuator will stop moving when no web
is seen by the sensor. This is similar to the automatic interlock mode that is available in the contrast guiding
application
NOTE:
This setting is only applicable for edge guiding applications since it is by default implemented for
contrast guiding.
NOTE:
This setting is only applicable for single edge guiding with one sensor since it is by default
implemented for center guiding with one or two sensors.
NOTE:
The actuator will move if the web is completely covering the sensor window. And the actuator would
stop moving only when no web is seen by the sensor. When two sensors are used both the sensors should
see no web for this feature to function.
Servo Center
The servo center functionality is typically implemented with an inductive proximity sensor that looks for the
home/middle position. It is possible to disable the use of an external proximity sensor and just use the
internal motor position counts. This parameter enables or disables the use of an external proximity sensor
for servo centering purposes. It is always recommended to use an external servo center sensor since the
sensor will reset/recalibrate the position tracking of the controller.
WARNING:
If an external servo center sensor is enabled but no servo center sensor is installed, the actuator
will still move until the physical limit is reached. This might cause the actuator to hit against its mechanical
limit and can cause damage to the actuator. However, the controller will automatically recognize the
absence of the servo center sensor and will perform a different routine to bring the actuator back to the
middle of its stroke. This might take a while depending on the actuator stroke and speed settings. If the
controller does not find the servo center sensor, it will automatically switch the servo center sensor back to
OFF.
WARNING:
If servo center polarity is set incorrectly, the controller will perform the above routine. Hence if
that happens the servo center polarity has to be reversed before turning this servo center switch back ON.
WARNING:
If the inductive proximity sensor is installed too far away from the target to actuate the switch
the servo center routine may not find the home/middle position.
NOTE:
If the servo center switch is turned off, pressing the servo center button would move the actuator to
the digital home/middle position. This position may not be the home/middle position for the actuator.
Content subject to change without notice
SCU5: Sensor and Web Guide Controller User Manual v 3.6| Page 41
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