Hypertherm Powermax1250 Service Manual - Manual (Page 38)

4
MAINTENANCE
powermax1250 Service Manual 3-5
Sequence of operation
Power OFF
• Connect the gas supply to the filter on the power unit.
• Connect the torch to the power supply.
• Connect the work lead to the workpiece.
• Apply power at the line voltage disconnect box.
• Set the ON/OFF switch (S1) to ON (I)
Set the power switch (S1) to OFF (O).
• The gas solenoid valve (V1) closes.
• The gas flow stops.
• The consumables reseat.
• The arc extinguishes.
• Postflow continues for 10 seconds.
• The arc transfers to the workpeice.
• Move the torch to make a cut.
• The workpiece drops after the cut.
• Release the plasma start trigger on the
hand torch or the remote start switch
for the machine torch.
• The gas solenoid valve (V1) opens.
• The gas flow starts.
• The torch nozzle and electrode
separate.
• The pilot arc starts.
• Position the torch above the workpiece.
• Pull the plasma start trigger on the hand torch or
press the remote start switch for the machine torch.
The power circuits are ready.
• The gas solenoid valve (V1)
closes.
• The gas flow stops.
• Set the gas pressure (see the Setup
section in the Operator Manual).
• Select the desired cutting amps with
the current adjustment knob.
The gas solenoid valve (V1)
opens to purge the system and
to allow the setting of pressure.
• Turn the current adjustment knob fully counterclockwise,
to the gas test position.
• Check the gas pressure setting.
• The power ON LED and the gas pressure LED illuminate
green, indicating system is ready for operation.
• Fault LEDs should be extinguished (see Troubleshooting
guide for more information).