OMRON ZX laser sensor maintenance

White: Judgment output 1 (HIGH)

Gray: Judgment output 2 (PASS)

Pink: Judgment output 3 (LOW)

Green: laser OFF input/zero reset, etc

Yellow: timed input/reset, etc

Important wiring rules:

Use a dedicated regulated power supply, especially when high resolution is required, to avoid sharing power with large interfering devices such as frequency converters and motors.

The linear output ground (shielded wire) must be grounded separately from 0V and cannot be directly short circuited, otherwise it will introduce common mode noise.

The total cable length (sensor head+extension cable) shall not exceed 10m. The extension cable must use ZX-XC □ A series (1m, 4m, 8m, 9m) and must be shielded twisted pair.

Do not lay the power cord (24V/0V) in the same cable tray as the high-voltage or power cord to prevent electromagnetic interference.

2.3 Sensor head cable connection

The sensor head comes standard with a 0.5m cable, which is connected to the amplifier unit through a connector. When extending, use ZX-XC □ A. Note: The reflective sensor (ZX-LT * * *) cable cannot be mixed with the reflective extension cable.

Parameter Setting and Optimization

3.1 Average frequency and response speed

The average count can be set to 1, 2, 4,..., 4096. The higher the average frequency, the better the resolution, but the longer the response time. Calculation formula:

First output delay=150 μ s × (average times+1)

Subsequent output cycle=150 μ s (when the average frequency is ≥ 2)

For example, the average number of times is 4096, with an initial output of approximately 614.6ms and subsequent outputs every 150 μ s. If quick response (<1ms) is required, the average number of times should be ≤ 8.

3.2 Teaching Methods

Two point teaching: Place the target object in two extreme positions, record the teaching values separately, and automatically set the threshold.

Location demonstration: Place the target object at the detection position and directly set the threshold.

Automatic teaching: Move the object being tested, and the sensor automatically captures the maximum and minimum values and sets a threshold.

Direct threshold setting: manually input numerical values.

3.3 Maintain Functionality

Sample hold: Lock the current measurement value at the rising edge of the timed input.

Peak/valley value maintenance: Continuously track the maximum or minimum value.

Peak to peak retention: tracks the difference between the maximum and minimum values.

Delay hold: Hold after delay.

Self peak/self valley value: automatically updated during each measurement cycle.

3.4 Calculation function (requires ZX-CAL2)

After connecting two amplifiers through ZX-CAL2, they can perform A-B (difference) or A+B (sum) calculations and output the results as new measurement values. For example, when measuring thickness, the difference between the upper and lower sensors is the thickness.

3.5 Mutual interference suppression

When two sensor heads are installed close to each other, they can be connected through ZX-CAL2 and the mutual interference suppression function can be enabled to alternately emit light and avoid crosstalk.

Laser safety and compliance

The ZX series laser sensor belongs to visible light semiconductor laser (wavelength 650nm, maximum output 1mW). Different models meet the following levels:

EN60825-1: Class 2 (diffuse reflectance, retroreflection, retroreflection) - Visible light wavelength, protection can be provided by human eye blink reflection, but cannot be viewed directly.

FDA: Class II (as above).

Safety operation requirements:

It is strictly prohibited to directly look at the laser beam or observe the reflected light through optical instruments.

The end of the laser beam path should be equipped with absorbing materials to avoid diffuse reflection to eye level.

The protective casing must not be disassembled, and repairs must be returned to OMRON.

The product is labeled with laser warning labels (yellow background with black symbols) and instruction labels.

Preheat for 10 minutes before use to stabilize the internal temperature.

Laser product labeling requirements (EN standard):

Class 2 products need to have the "Caution" label affixed to the body and indicate "Laser Radiation - Do Not Stare Into Beam".

The aperture label should be marked near the laser exit.

Common troubleshooting

5.1 Amplifier has no display or output

Possible reasons:

The power supply voltage is below 12V or exceeds 26.4V (allowable range is 12-24V ± 10%).

Reverse the polarity of the power supply (brown connected to 0V, blue connected to 24V).

The sensor head connector is not locked or the cable is broken.

The average frequency setting is too high, resulting in extremely slow response and mistaken for no output.

Troubleshooting:

Measure the voltage of the amplifier power terminal with a multimeter (should be between 19.2~26.4V, including ripple).

Check if the connector is properly inserted and try unplugging it again.

Reduce the average frequency to 1 or 2 and observe if the output changes.

5.2 Measurement value jumping or instability

Reason:

The surface reflectivity of the tested object undergoes drastic changes (such as alternating metal and black rubber).