Stop all of the choppers.
Stop the gas flow.
Start the post-flow gas flow.
Start the timer to stop the contactor.
Start the timer to stop the fans.
Start the timer to stop the coolant pump.
The cycle is completed.
Continue to Wait for Start state (5).*
* After an operator-selected process completes correctly, the cutting system goes back to Wait for Start
state (5) on page 221 to wait for the next command.
Refer to Initial inspection steps on page 273 for troubleshooting procedures.
High-voltage relay stages in the ohmic circuit
During a wet process – for example, N
2
/H
2
O – water can be a current path for the ohmic-sense circuit.
To prevent the flow of current to the ohmic PCB, the cutting system automatically opens the high-voltage
relay and disables the ohmic-sense circuit.
Ohmic sensing for the N
2
/H
2
O process is available. Stall force is necessary when the N
2
/H
2
O process is
used underwater.
During a dry process, the cutting system closes the high-voltage relay and enables the ohmic-sense circuit
(except during high-frequency starts).
Automatic purges
Plasma cutting system purges are automatic.
The system looks at these conditions to select the type of purge to do:
■
The process that is selected now
Operation
6
229811530Instruction ManualXPR460
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