Hypertherm Powermax65 Service Manual Rev.1 - Manual (Page 163)

TroubleshooTing and sysTem TesTs
powermax
65/85 Service Manual 5-37
Problem Meaning Causes Solution
Machine does not cut
well (does not appear to
be cutting at full cutting
power) and the arc does
not time out after 5
seconds.
Inadequate ground.
• Poor work lead
connection.
• Verify that the work lead is attached to
the workpiece and the workpiece is free
of rust, paint, or other coatings.
• Damaged work
lead.
• Check the resistance across the work
lead. If the resistance is greater than 3
Ω, repair or replace the work lead.
• Faulty pilot arc
IGBT.
• Turn the power OFF, remove the
consumables, and check the resistance
between the cathode and the work
piece. If the resistance is less than 5 kΩ,
check the resistance across the pilot
arc IGBT (two screws on 08). If the
resistance is less than 5 kΩ, replace the
pilot arc IGBT.
• Faulty control
board.
• Replace the control board.
Low output from the
power supply.
• Current is set too
low.
• Increase the current as needed.