Crossup Detected Error: Cleaning and Aligning the Material Feed Sensors

Error Shown on the Screen

When Light Sensor 1 and Light Sensor 2 do not agree, the Retro C displays a “Crossup Detected” popup and pauses material feeding. The warning is intended to prevent a board that is skewed or crossed up from continuing into the saw.

WARNING: Press E-STOP before touching, cleaning, or adjusting either sensor. If Auto Mode is active and E-STOP is not engaged, wiping Light Sensor 1 can be interpreted as a board entering the saw, and the machine may start. Do not reach into the material feed area until motion has stopped and the machine is in the safe state required by your facility.

What the Cross-Up Sensors Do

The two sensors monitor the board as it passes over the material feed arms. Light Sensor 1 reads one side of the board, and Light Sensor 2 reads the other side. Their readings should change at nearly the same time. If one sensor sees the board before or after the other sensor, the software interprets the difference as a possible cross-up.

On the stationary-side material feed arm, the cross-up sensor is the upper of the two sensors. On the carriage side, it is the only sensor. The carriage-side sensor is Light Sensor 2 and is easy to overlook during cleaning.

Most Common Causes

• A board is actually skewed or crossed up on the material feed arms.
• Sawdust or a dust film is covering one or both sensor faces.
• One sensor was bumped and rotated out of alignment.
• The sensor sensitivity is set too high or too low.
• A sensor cable or connector is loose or damaged.
• A sensor has failed.

Troubleshooting Procedure

1. Check the Lumber

1. Stop the machine and press E-STOP.
2. Confirm whether the board is physically skewed or crossed on the material feed arms.
3. If the lumber is crossed up, follow your facility’s approved material-removal and energy-control procedure. Do not pull lumber from a hazardous area while the machine can move.
4. After the lumber is correctly positioned and the area is clear, reset the machine and test the feed again.

2. Clean Both Sensors

1. Press E-STOP and wait for all motion to stop.
2. Wipe the face of Light Sensor 1 with a clean, dry towel.
3. Wipe the carriage-side Light Sensor 2. Cleaning only Sensor 1 can leave the mismatch unresolved.
4. Do not strike, twist, or move the sensors while cleaning them.
5. Reset the machine and run a straight board past both sensors to see whether the warning returns.

3. Check Sensor Alignment

If both sensors are clean and the warning continues, one sensor may have rotated out of position. A single mounting bolt holds each sensor and allows it to twist for alignment.

1. Use a straight board for the alignment test.
2. Run the board past Light Sensor 1 and Light Sensor 2 while watching the sensor-alignment value on the Check screen.
3. The target is as close to zero as practical. The acceptable range is −0.30 through +0.30.
4. If the reading is outside that range, press E-STOP before making an adjustment.
5. Loosen the sensor mounting bolt only enough to rotate the sensor slightly. Adjust the sensor, tighten the bolt, clear the area, and test again.
6. Repeat small adjustments until the reading remains within the acceptable range.

The following images show the sensors being positioned so that Light Sensor 1 and Light Sensor 2 detect the straight board at nearly the same point.

4. Check Sensor Sensitivity

Adjust sensitivity only after both sensors are clean and correctly aligned. The blue dial on the sensor changes its sensitivity. Turning the dial counterclockwise reduces sensitivity.

1. Press E-STOP before adjusting the dial.
2. Mark or record the current dial position so it can be restored if needed.
3. Make a small adjustment. Do not make a large change all at once.
4. Clear the area, reset the machine, and test with a straight board after each adjustment.

5. Inspect the Sensor and Cable

If cleaning, alignment, and sensitivity adjustments do not correct the problem, inspect the accessible cable and connector for looseness, cuts, crushed sections, or other damage. Do not repair or replace energized wiring.

Contact Enventek Technical Support before replacing parts. When replacement is approved, the sensor is generally checked or replaced before the cable because the sensor is more likely to fail.

What Correct Looks Like

• A straight board passes the two sensors without a “Crossup Detected” popup.
• The Check-screen alignment value remains between −0.30 and +0.30.
• Light Sensor 1 and Light Sensor 2 respond at nearly the same point.
• Material feeding resumes normally without repeated pauses.

Stop and Contact Enventek If

• The popup returns even though the board is straight and the alignment value is within range.
• The alignment reading is unstable or cannot be brought into range.
• A sensor will not detect a board or has no normal indicator response.
• A mounting bracket, cable, connector, or sensor is damaged.
• The lumber is repeatedly becoming physically crossed up.

For technical assistance, contact Enventek Technical Support at 269-815-4150.

Related Articles

• check material feed arm and carriage alignment
• replace the material feed encoder

Escalate When

Record the exact screen message, affected component, indicator-light state, and steps already attempted. Contact Enventek Technical Support if the fault remains or the machine does not respond as expected.