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Appendix A: Sensors
SMC ZSE30 Vacuum Sensor
The SMC ZSE30 Vacuum Sensor functions as a Pick & Place Head part present sensor. It com-
pares the vacuum pressure at the pick and place nozzle to a threshold point.
When the vacuum pressure drops beneath this level the sensor sends an OFF signal to the
machine (the LCD display will be green). When the vacuum rises above the threshold, the sensor
sends an ON signal to the machine (the LCD screen will be red).
Down Arrow Button
Adjusting the Vacuum Sensor
If the machine places "empty" pockets (i.e., places as though it held a part when it did not) or
returns a picking part error when it picked a part, the vacuum sensor's threshold point probably
needs to be adjusted.
To adjust the threshold point, follow these instructions:
1.
With no part on the nozzle and the vacuum ON, note the reading on the vacuum sensor.
Example: -60.5.
2.
Press the Set button. The sensor will alternately flash n_1 and the current setting. This is
the threshold point.
3.
Using the Up Arrow and Down Arrow buttons, adjust the value of n_1 to about 5 less
than the pressure reading that was noted with no part on the nozzle. Example: -60.5 - 5 =
-65.5.
4.
Press the Set button again. The sensor will now display the h (hysteresis) setting. This
should read 0.0.
5.
Press the Set button again to exit back to Normal Operation mode. Run the machine and
observe if the vacuum sensor is functioning properly.
6.
If the machine places empty pockets, set the threshold point closer to the pressure read-
ing when a part is on the nozzle. If the machine fails to detect a part on the nozzle when
SMC ZSE30 Vacuum Sensor
Pressure Reading Display
Set Button
A-4
Up Arrow Button
D292104.11.fm
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