4-8
O
PERATION
Operator Manual
COMMON CUTTING FAULTS
• The workpiece is not totally penetrated. Causes can be:
- The current is too low.
- The cut speed is too high.
- The torch parts are worn.
- The metal being cut is too thick.
- The work clamp is not properly attached to the workpiece.
• Dross forms on the bottom of the cut. Causes can be:
- The cutting speed is too slow.
- The torch parts are worn.
- The metal being cut is too thick.
- The current is too low.
DUTY CYCLE AND OVERHEATING
• The duty cycle is the amount of time, in minutes, that a pilot or plasma arc can remain "on" within a
10-minute period when operating at 104° F (40° C).
- At the 25-amp setting, the arc can remain on 3.5 minutes out of every 10 minutes without
causing the temperature sensors to disable the unit.
- At 20 amps, the duty cycle is 60%, or 6 minutes out of every 10 minutes.
- At 17 amps, the duty cycle increases to 100%.
• If the power supply overheats, the OVER-TEMP LED will illuminate, the arc will shut off and the
cooling fan will continue to run.
• To resume cutting, wait for the OVER-TEMP LED to extinguish (usually 15 minutes or less) and
reduce amperage or duty cycle.
1-99
To Next Page
Loading...
