Loadstar Sensors DS-3000 Digital Load Cell Display & Controller - Manual (Page 32)

DS-3000U DS3000 User Guide
Loadstar Sensors, Inc. Page: 32 / 48 033-01419 Rev. 4
8. Press down to trgr 2, press enter and a new numeric field appears. Enter the threshold of 40
Lbs. Press enter when completed. Although this example does not use it, it might be a good
idea to choose some hysteresis to avoid the output pulsing if the weight fluctuates around the
set-point.
9. Select pnt2ra for pnt2 using the enter key to select. This will “reset” or de-activate the output,
once activated, when the load rises above 40 Lbs.
10. Press down to sen1 corresponding to sensor 1. Press enter until “ S
” is displayed. This
means that the trigger condition will include the sum of sensor 1.
11. Press down and repeat for SEN2, SEN3 and SEN4. This way the sum of all four sensors will be
used to determine the trigger criteria.
12. Finally, press down to duratn, press enter and make sure it is set to contin. This means the
output will remain activated until reset by the PNT2 condition above, once triggered by the PNT1
condition.
13. Press enter to leave this field. Next we will program output 2
14. Press mode until you reach the relay 2 menu.
15. Press down, to the trgr 1 entry. Press enter, and a numeric entry field will appear. Enter the
Relay 2 threshold at 70 Lbs. Press menu until the digit corresponding to the 7 is highlighted,
then press up and down to set the digit to 7. Press mode again to highlight each digit in turn,
then up and down to set each one to the correct value. Please note the decimal point location!
16. Press enter when you are complete. Press down to get to the next programming entry.
17. Select pnt1tb for pnt1 using the enter key to select.
18. Press down to trgr 2, press enter and a new numeric field appears. Enter the threshold of 70
Lbs. Press enter when completed.
19. Select pnt2ra for pnt2 using the enter key to select. This will “reset” or de-activate the output,
once activated, when the load rises above 70 Lbs.
20. Press down to sen1 corresponding to sensor 1. Press enter until “ S
” is displayed. This
means that the trigger condition will include the sum of sensor 1.
21. Press down and repeat for SEN2, SEN3 and SEN4. This way the sum of all four sensors will be
used to determine the trigger criteria.
22. Finally, press down to duratn, press enter and make sure it is set to contin.
23. Press enter to leave this field
24. Now exit programming mode: Press mode until the run entry
25. Then press enter to return to run mode.
26. Once in run mode, the program is fully operational.
9.3 Go/NoGo Acceptable Weight Limit Test
In many production processes, a fully packaged product has a very specific weight. If the weight deviates
above or below that value, by only a small amount, there is likely a problem with that product, and it should
be shunted off the production line for further investigation.
This application monitors a remote contact which is enabled when after a product is deposited on a scale
composed of a single sensor. The DS-3000 then weighs the device, and if it falls above or below a
predetermined threshold, activates it’s output, in turn causing a mechanical flapper to alter the path of the
product off of the assembly line.
Like all manufacturing environments, the scale is subject to constant weight fluctuations due to temperature
changes, material buildup, etc. And should be tared (aka. reset to zero) as frequently as possible. Ideally,
the system will provide a “remote tare” signal when the scale is unloaded before every product test, and then
will provide a “remote load sense” signal, when the scale is appropriately loaded, ready for test.