Hypertherm HT2000LHF, Instruction Manual

Page: 62 / 202

OPERATION
HySpeed HT2000LHF
Instruction Manual
4-9
6
Adjust Cut Flow Gases and Prepare for Cutting
13. Set S2 on the gas console to Test Cut Flow.
14. Look at the oxygen (FM2) and/or nitrogen / air (FM1) flowmeters on the gas console and set the Cut Flow
plasma gas flow rate % by referring to the
Cut Charts
and adjusting the Plasma Cut Flow metering valve
(MV1).
Note: If you have changed consumable parts or if the power supply has been off for more than 1 hour, purge gas
lines by leaving the system in Test Cut Flow for one minute.
15. Set S2 to Run after the test preflow and test operate flow rates have been set.
The system is now ready for operation.
Common Cutting Faults
•
Torch pilot arc will initiate, but will not transfer. Causes can be:
1. Work cable connection on the cutting table is not making good contact.
2. Malfunction in the system. See
Section 5
.
• The workpiece is not totally penetrated, and there is excessive sparking on top of the workpiece. Causes can be:
1. Current is set too low (check
Cut Chart
information).
2. Cut speed is too high (check
Cut Chart
information).
3. Torch parts are worn (see
Changing Consumable Parts
).
4. Metal being cut is too thick.
• Dross forms on the bottom of the cut. Causes can be:
1. Cutting speed is too slow or too fast (check
Cut Chart
information).
2. Arc current is set too low (check
Cut Chart
information).
3. Torch parts are worn (see
Changing Consumable Parts
).
• Cut angle is not square. Causes can be:
1. Wrong direction of machine travel.
High quality side is on the right with respect to the forward motion of the torch.
2. Torch-to-work distance is not correct (check
Cut Chart
information).
3. Cutting speed is not correct (check
Cut Chart
information).
4. Arc current is not correct (check
Cut Chart
information).