INSTALLATION & OPERATION MANUAL
23 | P a g e w w w . n t e n g i n e e r s . i n
Sequence of Operation
1. The THC waits for the CUT signal from the CNC to begin the cutting cycle. When the THC
received the CUT signal it begins the cutting cycle by starting the IHS Operation.
2. After IHS is completed the torch is at the Pierce Height that is set by the user (POT). The THC
then issues the PLASMA START signal to start the arcing of the Plasma Torch.
3. The THC then waits for the Pierce Delay time that is set by the user (POT).
4. After the pierce delay is completed the THC lowers the torch by the Cut height distance set by
the user (POT).
5. The THC then reads and confirms the actual arc voltage of the plasma Arc and if sufficient
issues the OK to MOVE signal to the CNC controller to start motion of the plasma torch in X,Y
direction to begin the cutting process.
6. The THC continuously corrects the height of the torch based on the Actual Arv Voltage and the
set voltage. The THC raises the torch is the Actual arc voltage is less than the set arc voltage and
lowers the torch if the actual arc voltage is higher than the set voltage. The USER can press UP
and DOWN during the cutting operation to dynamically change the Set Arc Voltage. The THC does
not perform any correction movement during the time the CORNER signal is issued from the CNC
to prevent the torch diving into the job as the speed is reduced around corners and kerfs. If the
Float as Collision setting is set to enabled and the floating switch if triggered during cutting which
signified the torch crashing or hitting an obstacle the THC stops the PLASMA START signal and
the OK to MOVE signal and displays a collision warning. The user can resolve the condition and
resume cutting by issuing a CUT signal again.
7. Once the cut signal is withdrawn the THC raises the torch by the Partial Raise Ht distance.
[Available in settings] and waits for the next CUT signal.
8. If no activity or signal is issued for Full Retract Dly then the THC retracts fully upward till the up
limit is triggered.
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