Hypertherm XPR300 - Page 285

Diagnostics and Troubleshooting
8
XPR300 Instruction Manual 809480 285
620
Alert
Rampdown error
(arc stretch)
detected
The chopper duty cycle
exceeds the programmed
limit. A rampdown error can
be the cause.
During a ramp-down error,
the arc distance between the
torch and workpiece
increases rapidly.
Rampdown errors can
decrease consumable life.
The XPR cutting system can
detect and react to
rampdown errors. This helps
extend the life of consumable
parts. Refer to Automatic
rampdown error protection
on page 235.
Make sure that you are following correct cutting
techniques:
• Use a workpiece that is large enough for the
selected parts or nesting program.
• Use the correct parts or nesting program.
Rampdown errors can occur when crossing
large kerfs or cutting at incorrect heights.
• End every cut with the plasma arc still attached
to the workpiece.
• Decrease the cutting speed when the end of
the cut is near.
• Stop the plasma arc before the part is
completely cut (allow completion of the cut
during rampdown).
• Program the path of the torch into the scrap
area for rampdown.
Ramp down Start or set
process;
remote on-off
621
Failure
Over voltage-DC
bus
The DC bus voltage is more
than 414 V.
1. Confirm the input-line voltage is within+/-14%
of nominal. Refer to Input power requirements
on page 42.
2. If the code continues, contact your cutting
machine supplier or regional Hypertherm
Technical Service team.
Shut down Remote on-off
Diagnostic code
number and
category
Diagnostic code
name
Description Corrective action XPR action
Code cancels
with