Hypertherm HT4001 Plasma Arc Cutting System - Manual (Page 100)

OPERATION
3-97
HT4001
Instruction Manual 5-9
3. Verify that the proper consumables are installed in the torch. Refer to the Cut Charts to choose the correct
consumables for your cutting needs. See also Changing Consumable Parts later in this section.
4. Turn the required supply gas ON.
Set the pressure on the nitrogen supply to read 150 psi +/- 10 psi (10.3 bar +/- 0.7 bar) at the N
2
pressure
gauge on the gas console.
Set the pressure on the oxygen supply to read 120 psi +/- 10 psi (8.3 bar +/- 0.7 bar) at the O
2
pressure
gauge on the gas console.
5. Turn the water supply to the water chiller ON.
6. Set the main disconnect switch for the water chiller to the ON position and depress the START switch on the
water chiller. Outlet water pressure should read between 175-185 psi (12-12.8 bar) on the water chiller gauge.
See IM241 Water Chiller Model D instruction manual for adjustment procedure, if necessary.
7. Set S1 on the gas console to plasma gas N
2
or O
2
.
8. Set the main disconnect switch for the power supply to ON and throw the POWER circuit breaker on the rear
of the power supply to the UP position. Verify that the POWER AC indicator illuminates.
9. Set the VOLTAGE and CURRENT on the DR V/C module. Select the arc current and voltage from the Cut
Charts for the type and thickness of metal to test cut.
Notes: • If using the H-401 power supply as a slave and you need to reduce the existing arc
current level, lower the current to below 360A on the remote V/C before resetting to the
desired value.
• If using the H-401 power supply as a slave, note that the current control adjust knob on the
front of the H-401 supply will have no effect on setting current for the slave.
10. Set the S2 toggle switch to Test Preflow. Set the preflow flow rate(s) on the O
2
and/or N
2
flow meters using the
MV2 and MV3 metering valve. Select the test preflow rates from the Cut Charts.
11. Set S2 to Test Cut Flow. Set the cut flow rate on the O
2
or N
2
flow meters using the MV1 metering valve.
Select the test cut flow rates from the Cut Charts.
12. Check the water flow rate at the water flow meter and adjust with MV4, if necessary. Water flow rates are
specified in the Cut Charts.
13. Verify that there is a uniform conical water pattern at the front of the torch. If the pattern is irregular, shut the
power supply down at the main disconnect switch and check the nozzle and swirl ring. Replace with new parts,
if worn or damaged.
14. Set S2 to Run after setting the preflow and cut flow rates.