B-5
OPERATION
IDEALARC® DC-1000
B-5
All the NA-3’s when used with the DC-1000 are
capable of cold starting with the constant current
board mode switch in CC. Cold starting permits the
wire to be inched down to the work, automatically
stop, and automatically energize the flux hopper
valve. All NA-3’s made after September, 1976 are
capable of cold starting on either CV or CC settings of
the constant current board.
On the NA-3, set the open circuit voltage control to the
same dial setting as the arc voltage control. If the
procedure has not yet been established, a good
starting point is to set the OCV to #6.
Run a test weld, setting the proper current, voltage
and travel speed. Once the proper welding procedure
is established and if the start is poor - wire blast off,
stub, etc. - adjust the NA-3 OCV and inch speed
controls for optimum starting. In general, a low inch
speed and an OCV dial setting identical to the voltage
dial setting will provide the best starting.
To further optimize starting, adjust the OCV by making
repeated starts and observing the NA-3 voltmeter
action. With proper adjustment of the OCV control, the
voltmeter needle will swing smoothly up to the desired
arc voltage and thus provide repeatable starts.
If the voltmeter swings
above
the set voltage and then
back to the desired welding voltage, the OCV setting
is
too high
. This usually results in a bad start where
the wire tends to “blast off”.
If the voltmeter needle hesitates
before
coming up to
the desired voltage, the OCV is set
too low
. This will
cause the electrode to stub.
3.
NA-5
- Set the DC-1000 mode switch to the
process being used - CV Innershield or CV
Submerged Arc. Set the DC-1000 panel/remote
switch in the remote position. Set the OCV control
four volts higher than the welding voltage and the
inch speed at 1/2 the welding wire feed speed for
the initial test weld. Adjust the OCV and inch
speed as required for optimum starting. Refer to
the NA-5 instruction manual for data regarding the
setup of controls and modes on the NA-5.
4.
LN-8
- Set the LN-8 mode switch (located on the
CC board) to the CV position. Set the DC-1000
mode switch on CV Innershield or CV Submerged
Arc according to the process being used.
5.
LN-7, LN-9 and other constant wire feed units
-
Set the DC-1000 mode switch on CV Innershield
or CV Submerged Arc according to the process
being used. If using an LN-9, refer to the LN-9
instruction manual for further instructions on its
use. If using an LN-7, it will be necessary to use
either a K775 Remote Control or operate the
DC-1000 with the panel/remote switch in the
panel position.
