Tweco iCNC XT - Manual (Page 42)

iCNC XT
3-22 INSTALLATION Manual 0-5299
3.18 Encoder Values
Select 1.3. Encoder Values from iCNC Setup.
Normal encoder values are in the 100 000 – 5 000 000 range.
You can calculate the encoder value like follows:
Metric: (1005.3088mm x encoder pulses per revolution x 4 x gear ratio) / (module x π x number of teeth in pinion) = Encoder value
Imperial: (39,57909 x encoder pulses per revolution x 4 x gear ratio) / (Effective Diameter x π) = Encoder value
1. Type in your encoder values and click recalculate.
2. Click Apply
Check that you are moving the correct distance by doing the following:
1. Have just one motor connected to the rail at a time.
2. Put drive switch to ON
3. Move the machine to the front of the rail or reference mark. Reset the encoder counters by pressing the Reset counters button. Press
the “Jog On/off” button to enter manual mode (note: the manual mode button will flash on-off). Using the directional keys or cor-
responding drive direction button, move the machine as long of a distance as is possible. Measure the machine position from the end
of the rail or reference mark, using a metric tape measure and write down the distance.
4. Check from the coordinate display for the distance the CNC measured and write it down.
5. Zero the position.
6. If your measured distance and the distance the CNC measured are different, calculate the correct encoder value by: Dividing the dis-
played distance with the actual travel distance and then multiply the encoder value with the result. Example:
• Encoder value in screen = 1143818.000
• Actual moved distance = 3000mm
• CNC displayed distance = 1500mm
• 3000 / 1500 = 2
• 2 x 1143818.000 = 2287636.000
• Correct encoder value = 2287636.000
7. If needed redo the steps above to set the correct encoder value.
8. Put the Drive Enable Switch on the front of the controller to “OFF”