3.6 Electrical Grounding and Noise
The capacitive height sensing circuitry
contained in the FiberCUT
®
2D cutting
head measures small changes in electrical
capacitance between the tip and earth-
ground to determine tip-to-part standoff
distance. In order for this circuit to function
properly, the part and the cutting head
need to be connected to a good earth
ground.
Ideally, the ground should be
established from a ground rod,
approximately 2 meters in length driven
into the ground located near the base
of the machine.
A large gauge (1.6mm diameter or
larger) ground wire should be run from
the ground rod to the part.
Run a separate wire from the ground
rod to the FiberCUT
®
2D grounding lug.
See Figure 26.
Figure 26
Electrical noise can create height-sensing
issues. Large electric motors, arc welders
and other devices may be a source of
significant electrical noise. In order to
eliminate this noise, it may be necessary to
connect a ground wire to the chassis of any
such device near the process.
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