Low Label Sensor - Printronix SLPA7000 User Manual

Appendix

Low Label Sensor

Low Label Sensor
The low label sensor activates the warning beacon to alert the operator of a
low label situation. This photo eye sensor is typically not adjusted after
manufacturing as it is located behind the media unwind assembly. Its position
may be moved to allow more or less media stock on the unwind roll before
signal activation. Proceed as follows:
1. Remove the front label roll retainer and the label roll back stop.
2. Remove the two #2 screws, relocate the sensor in one of the three
possible sensor hole locations, and replace the #2 anchoring screws.
3. Replace the front label roll retainer and the label roll back stop.
When the label stock is running low, the low label signal state should be ON.
To test the label low input:
1. Remove the label stock from the label roll hub while monitoring this signal
state.
2. Turn the label roll hub so that the sensor is not visible through one of the
slots in the label roll back stop.
3. Clear the fault condition by feeding label/ribbon stock through the
printhead as noted by the display instructions.
4. Once the error is cleared, rotate the label roll back stop until the low label
sensor visibly aligns with one of the open slots in the plate. The input
state (input X3 on the PLC) should change from OFF to ON as the slot
passes in front of the sensor. If the signal state does not change, the
sensor and it's wiring may need maintenance.
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Figure 71. Low Label Sensor Adjustment