Operation
SR-45i User’s Manual
Manual Cutting Mode
To place the SR-45i in the manual cutting mode, set the Mode Switch
thumbwheel to position number 0. The manual cutting mode is used when it is
necessary to automatically reestablish a lost cutting arc. For example, if the torch
is going to cross a pre-cut kerf during a cutting sequence, the arc may be lost. In
mode 0, the pilot arc relay will automatically close and the arc will be reignited.
The sequence for initiating the arc is the same as in the mechanized cutting mode.
However, when the cutting arc is lost, the pilot arc is reestablished with
continuous high frequency and will remain in the pilot arc high frequency state
until a cutting arc is reestablished. The x/y machine motion signal will remain
enabled during restarting of the cutting arc. The cutting sequence is terminated
when the plasma start signal is disabled.
Grate Cutting Mode
To place the SR-45i in the grate cutting mode, set the Mode Switch thumbwheel
to position number 5. The grate cutting mode is used for cutting expanded metal
or grate material. The starting sequence is the same as that for mechanized
cutting. However, the pilot arc relay remains closed during the cut. As a result,
the torch reverts to a pilot arc condition when the transferred arc is lost in spaces
between the metal. The x/y machine motion signal remains enabled until the
plasma start signal is removed. High frequency starting is only required for the
initial cutting arc, but will reignite the arc if it is lost for some reason. The cutting
sequence is terminated when the plasma start signal is disabled.
Insulation Cutting Mode
To place the SR-45i in the insulation cutting mode, set the Mode Switch
thumbwheel to position number 9. The insulation cutting mode provides a
continuous pilot arc for cutting nonmetallic substances. The cutting current is
automatically set on the logic-regulator p.c. board, and any front panel current
setting is ignored.
When the pilot arc is established, the x/y machine motion signal is enabled, even
there is no transferred arc. As in the other modes, the x/y machine motion signal
can be delayed for up to three seconds after arc initiation by adjusting the motion
delay potentiometer on the front panel. The cut is terminated when the plasma
start signal is removed.
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Summary of Contents for SR-45i
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Page 55: ...Parts List SR 45i User s Manual Figure 6 1 Control Panel 6 3 ...
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Page 65: ...Parts List SR 45i User s Manual Chopper P C Board Figure 6 10 Chopper P C Board 6 13 ...