Hypertherm Powermax190c Operator Manual - Manual (Page 39)

OPERATION
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powermax
190c Operator Manual
Common Cutting Faults
• The workpiece is not totally penetrated. Causes can be:
– 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.
• Arc “sputters” and torch consumable life is reduced. Cause can be:
– Humid conditions in the cutting area causing moisture in the torch. The Powermax190c
internal compressor uses ambient air to produce the plasma cutting gas. If this air is moist,
water droplets can be introduced to the torch. This condition is not harmful to the torch.
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 12 amps, the arc can remain on 3.5 minutes out of every 10 minutes without causing the
temperature sensors to disable the unit.
• If the power supply overheats, the FAULT lamp will illuminate, the arc will shut off and the cooling
fan will continue to run.
• To resume cutting, wait for the FAULT lamp to extinguish (usually 15 minutes or less).