Hypertherm LH2100 - Manual (Page 34)

1
OPERATION
LH2125/LH2100 Laser Head Instruction Manual 4-7
Capacitive height sensing
Introduction
The capacitive height sensor measures the relative capacitance between the cutting head nozzle and the work piece.
The lower part of the cutting head is electronically excited and acts as a guard against any stray capacitance from other
sources including the moving components in the cutting head. The signal to the nozzle is carried by the center
conductor of the internal coaxial cable. The signal to the lower part of the cutting head is carried on the shield of the
internal coaxial cable.
Note: It is important that the lower part of the cutting head is not shorted to ground, and that there is
electrical isolation between the nozzle and the lower part of the cutting head. Isolation is
provided by the insulating washer and a ceramic coating on the top side of the nozzle adapter
and prevents a false tip-touch error signal.
Lower part of the cutting head
If a false tip-touch error is suspected:
Remove nozzle and retaining ring. Inspect for particles between parts, damage and cleanliness. Replace as necessary.
Nozzle
Retaining nut
Insulating washer
Nozzle adapter
Shown with spatter shield and spatter shield retaining nut
Retaining nut wrench (104222)
Retaining nut wrench (104223)
Spatter shield
Spatter shield
retaining nut