Hypertherm Powermax125 Service Manua - Manual (Page 148)

148 Powermax125 Service Manual 808070
8 – Troubleshooting and System Tests
The arc
extinguishes, but
re-ignites when
the torch trigger is
pressed again. The consumables are worn
or damaged, the gas filter
element is contaminated, or
the input gas pressure is not
at the proper level. • The consumables
need to be replaced.
• Replace the consumables as needed.
• The gas filter element
needs to be
replaced.
• Replace the gas filter element if it is
contaminated.
• The gas pressure is
too high or too low.
• Manually adjust the gas pressure as
needed.
The arc sputters
and hisses. The gas filter element is
contaminated, or the input
gas line contains moisture. • The gas filter element
needs to be
replaced.
• Replace the gas filter element if it is
contaminated.
• The input gas supply
needs to be cleaned.
• Inspect the gas line for moisture. If
necessary, install or repair the gas
filtration to the power supply. See
Power Supply Setup on page 29.
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. • 1) Turn the power OFF, 2) remove the
consumables, and 3) check the
resistance between the plunger and
the workpiece.
• If the resistance is less than 5 kΩ,
check the resistance across the pilot
arc IGBT. If that resistance is less
than 5 kΩ, replace the pilot arc IGBT.
• Faulty DSP board. • Replace the DSP board.
Low output from the power
supply. • Current is set too
low.
• Increase the current as needed.
Problem Meaning Causes Solution