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High Frequency Interference
The following is a list of items to look for/correct in helping prevent noise from interfering with the correct operation on our machines.
1. Encoder cables should not be routed in the same Y-axis power track as torch leads. Use opposing Y-axis power track where feasible. If possible, encoder cable should be ran in a separate power track on the X/W axis. If not possible then get as much space as possible between the torch lead and the encoder cables.
2. If the encoder cable must cross over the torch lead it must cross over perpendicular to the torch lead.
3. Check voltage on Atas connectors X1-2, X2-2, and X4-2 to assure that the voltage is approximately 5.4Vdc. This gives you your maximum signal to noise ratio. This voltage should be checked with the encoders plugged into the PIO board. If the voltage is to low, adjustments can be made to the adjusting potentiometer on the ATAS ANC 40-NG power supply. The maximum threshold voltage is 5.4Vdc.
4. Check to verify that the plasma torch/torch leads fit correctly and if there is extra leads then they are not coiled up and shoved into the beam or power track.
5. Check ground rod using the light bulb test from the machine manual.
6. Verify that the encoder cables have an internal shield and it is connected to the appropriate connector:
X-axis—X1 pin 9
W-axis—X4 pin 9
Y-axis—X2 pin 9
7. Verify all grounding on machine is connected to one point and one
ground cable leaves this point and connects to earth ground.
8. Verify that the torch/torch cables do not run in close proximity to
encoder cables or encoder assemblies.
9. Verify that the encoder cables outer shield is grounded at the CNC
and at the motor/encoder.
10. Verify spark gap setting for plasma is in accordance with the
manual.
11. Verify that when the torch crosses station carriage it in not very
close or touching the encoder. Maintain distance between torch lead
and Y-axis motor/encoder assembly.
12. Verify control cable between the power supply and relay box is
grounded properly at the relay box end.
13. Run ground wire from Vision control clamp ground bar to
machine star ground.
14. Run ground from drive assemblies to the machine star ground.
15. Run ground wire from the machine star ground to the table where the power supply work cable is attached.
16. Regularly clean work cable and ground cable connections to maintain good conductivity (similar to battery terminals on a car).
17. Regularly check spark gap points inside the high frequency unit for proper distance and cleanliness.
1. Encoder cables should not be routed in the same Y-axis power track as torch leads. Use opposing Y-axis power track where feasible. If possible, encoder cable should be ran in a separate power track on the X/W axis. If not possible then get as much space as possible between the torch lead and the encoder cables.
2. If the encoder cable must cross over the torch lead it must cross over perpendicular to the torch lead.
3. Check voltage on Atas connectors X1-2, X2-2, and X4-2 to assure that the voltage is approximately 5.4Vdc. This gives you your maximum signal to noise ratio. This voltage should be checked with the encoders plugged into the PIO board. If the voltage is to low, adjustments can be made to the adjusting potentiometer on the ATAS ANC 40-NG power supply. The maximum threshold voltage is 5.4Vdc.
4. Check to verify that the plasma torch/torch leads fit correctly and if there is extra leads then they are not coiled up and shoved into the beam or power track.
5. Check ground rod using the light bulb test from the machine manual.
6. Verify that the encoder cables have an internal shield and it is connected to the appropriate connector:
X-axis—X1 pin 9
W-axis—X4 pin 9
Y-axis—X2 pin 9
7. Verify all grounding on machine is connected to one point and one
ground cable leaves this point and connects to earth ground.
8. Verify that the torch/torch cables do not run in close proximity to
encoder cables or encoder assemblies.
9. Verify that the encoder cables outer shield is grounded at the CNC
and at the motor/encoder.
10. Verify spark gap setting for plasma is in accordance with the
manual.
11. Verify that when the torch crosses station carriage it in not very
close or touching the encoder. Maintain distance between torch lead
and Y-axis motor/encoder assembly.
12. Verify control cable between the power supply and relay box is
grounded properly at the relay box end.
13. Run ground wire from Vision control clamp ground bar to
machine star ground.
14. Run ground from drive assemblies to the machine star ground.
15. Run ground wire from the machine star ground to the table where the power supply work cable is attached.
16. Regularly clean work cable and ground cable connections to maintain good conductivity (similar to battery terminals on a car).
17. Regularly check spark gap points inside the high frequency unit for proper distance and cleanliness.