Thermal Dynamics CUTMASTER 60i Service Manual page 33

Set Operating Pressure
1. Gas pressure must be set in the cutting mode to be used, not in the SET/PURGE mode. Each mode may
require a different pressure for optimal cutting. (90 - 125 PSI / 6.2 - 8.6 bar)
2. Set the gas pressure/flow using the lower knob, 2. Changes will show on the Gas Pressure Interlock
The green indicator in the center is the ideal setting. Each indicator when lit separately is equal to 5 lbs. from
the segment next to it. Each will show 5, 10 or 15 lbs or more below or above the ideal. When two segments
are illuminated together then the change is half as much or 2.5 lbs.. The pressure settings will all be affected
by the other settings for torch, torch length and type of cutting and will require adjustments to the pressure
setting.
Cutting Operation
When the torch leaves the workpiece during cutting operations in the RUN mode, there is a brief delay in restart-
ing the pilot arc. With the system in the RAPID AUTO RESTART mode, when the torch leaves the workpiece
the pilot arc restarts instantly, and the cutting arc restarts instantly when the pilot arc contacts the workpiece.
(Use the 'Rapid Auto Restart' mode when cutting expanded metal or gratings, or trimming operations when
an uninterrupted restart is desired).
With the system in the LATCH mode the main cutting arc will be maintained after the torch switch is released.
To exit or cancel the LATCH mode, press and release the trigger again or lift the torch from the cutting surface
so the arc goes out.
Typical Cutting Speeds
Cutting speeds vary according to torch output amperage, the type of material being cut, and operator skill.
Refer to Section "4T.08 Recommended Cutting Speeds for Mechanized Torch With Exposed Tip" and following
for greater details.
Output current setting or cutting speeds may be reduced to allow slower cutting when following a line, or using
a template or cutting guide while still producing cuts of excellent quality.
Postflow
Release the trigger to stop the cutting arc. Gas continues to flow for approximately 20 seconds. During post -
flow, if the user moves the trigger release to the rear and presses the trigger, the pilot arc starts. The main arc
transfers to the workpiece if the torch tip is within transfer distance to the workpiece.
Shutdown
Turn the ON / OFF switch to OFF, to the left as you face the unit from the rear. After a short delay all Power
Supply indicators and fan shut OFF. Unplug the input power cord or disconnect input power. Power is re-
moved from the system.
Manual 0-5475
NOTE!
Before the gas pressure is set, the torch type, leads length, type
of cutting and amperage should all be set as they will affect the
pressures required. If any of those are changed, the pressure
should be checked again to make sure it is optimized.
NOTE!
To maximize the longevity of the internal electronics, allow the
power supply to continue running (without cutting) until the cool-
ing fan speed changes to slow.. This may take a few minutes
OPERATION
CUTMASTER 60i
4-7